https://jobs.co.uk/jobs-results?Keyword=Principal%20Mechanical%20Engineer&RadiusMiles=10 RSS feed for Principal Mechanical Engineer Jobs. en-gb Sun, 26 Apr 2026 04:17:53 GMT https://jobs.co.uk/job/principal-mechanical-engineer-building-services-design-konker-recruitment--6e50edf4-69f0-403e-994e-b9d6c4493a5c https://jobs.co.uk/job/principal-mechanical-engineer-building-services-design-konker-recruitment--6e50edf4-69f0-403e-994e-b9d6c4493a5c Sat, 25 Apr 2026 11:55:30 GMT Location: City | Salary: 50000.00-50000.00 Annual | Type: Permanent | Principal Mechanical Engineer Building Services Design Birmingham city centre Salary up to and around £65,000 + benefits Sociable team, early finish Fridays, employee owned business, vast project range, city centre location, great benefits and plenty of growth opportunity! This is the perfect role for someone hoping to escape big company structures and enter an employee owned, medium business family feel vibe! About the opportunity This consultancy provides mechanical and electrical building services design, net zero carbon, and responsible building advice for a wide range of developments including commercial, offices, industrial, residential and private medical projects. They have earned themselves a great reputation for their services and high-quality output. This is an employee-owned business with a multi-disciplined team of 38 engineers/consultants. They re in an amazing, city centre location office which has recently been refurbished, so a great place to be! Also offering an element of flexible working! They are looking for a Senior or Principal Mechanical Engineer to hit the ground running. Benefits: Salary circa £55,000-£65,000 DOE. Freshly refurbed office with break... Permanent https://jobs.co.uk/job/senior-principal-mechanical-engineer-rgb--b6038632-39dc-422b-a5fc-0966f6136a6f https://jobs.co.uk/job/senior-principal-mechanical-engineer-rgb--b6038632-39dc-422b-a5fc-0966f6136a6f Sat, 25 Apr 2026 11:50:02 GMT Location: Exeter | Salary: £48000 - £65000 per annum | Type: Permanent | Senior / Principal Mechanical Engineer – Building Services (MEP) Location: Exeter Type: Full-Time, Permanent Working Pattern: Hybrid Working and Flexible Hours ------------------------- Summary Senior / Principal Mechanical Engineer required for a Building Services (MEP) consultancy with an established presence across the South West and multiple offices across the UK. This role supports the delivery of mechanical building services design across a range of projects, with responsibility for project delivery, client interaction, and technical design. The position also contributes to team development, project coordination, and commercial awareness across project lifecycles. About the Company  A Building Services (MEP) and sustainability consultancy established in 2004, with multiple offices across the UK. The Exeter office forms a key part of the South West operation, supporting the delivery of mechanical and electrical design across a range of sectors including education, healthcare, commercial and public sector projects. The business specialises in sustainable building services design, including mechanical and electrical engineering, BIM-led digital delivery, and l... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-building-services-tozer-associates--d5e6c898-a4fa-4b9f-857b-cf1851ff96a1 https://jobs.co.uk/job/principal-mechanical-engineer-building-services-tozer-associates--d5e6c898-a4fa-4b9f-857b-cf1851ff96a1 Thu, 23 Apr 2026 23:00:00 GMT Location: Manchester | Salary: £80,000 | Type: Permanent | Take ownership of major projects and lead your own team while shaping your path to Associate Directorship. Youll guide mechanical building services projects from concept to completion, with the freedom to influence design decisions and mentor the next generation of engineers. With four days a week working from home, youll enjoy the flexibility to focus on what matters most, both professionally and ... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-building-services-design-konker-recruitment--a698e727-7a1e-48b9-91a6-c17a4ca89073 https://jobs.co.uk/job/principal-mechanical-engineer-building-services-design-konker-recruitment--a698e727-7a1e-48b9-91a6-c17a4ca89073 Thu, 23 Apr 2026 23:00:00 GMT Location: Birmingham | Salary: £50000 - £65000/annum Circa £60,000 | Type: Permanent | Principal Mechanical Engineer Building Services Design Birmingham city centre Salary up to & around £65,000 + benefits Sociable team, early finish Fridays, employee owned business, vast project range, city centre location, great benefits and plenty of growth opportunity! This is the perfect role for someone hoping to escape ‘big company’ structures and enter an employee owned, medium business family feel vibe! About the opportunity This consultancy provides mechanical and electrical building services design, net zero carbon, and responsible building advice for a wide range of developments including commercial, offices, industrial, residential and private medical projects. They have earned themselves a great reputation for their services and high-quality output. This is an employee-owned business with a multi-disciplined team of 38 engineers/consultants. They’re in an amazing, city centre location office which has recently been refurbished, so a great place to be! Also offering an element of flexible working! They are looking for a Senior or Principal Mechanical Engineer to hit the ground running.  Benefits: Salary circa £55,000-£65,000 DOE. Fre... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-newbury-morson-edge--a5774f2b-3299-4aef-8380-cc5bf07ab12a https://jobs.co.uk/job/principal-mechanical-engineer-newbury-morson-edge--a5774f2b-3299-4aef-8380-cc5bf07ab12a Tue, 21 Apr 2026 23:00:00 GMT Location: Newbury | Salary: Negotiable | Type: Permanent | Job Title: Principal Mechanical Engineer Location: Newbury Reading + Hybrid Working Arrangement Compensation: Competitive Salary + Benefits Role Type: Full time / Permanent As a Principal Mechanical Engineer, you''ll have a role that''s out of the ordinary. You''ll maintain the engineering configuration, ensuring the overall design intent and integrity is maintained throughout design lifecycle. Th... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-psr-solutions--ec30f564-f299-4b72-af70-7ab426e0cf65 https://jobs.co.uk/job/principal-mechanical-engineer-psr-solutions--ec30f564-f299-4b72-af70-7ab426e0cf65 Tue, 21 Apr 2026 11:52:48 GMT Location: Bromsgrove | Salary: 60000.00-60000.00 Annual | Type: Permanent | Client informationOur client is a well-established engineering organisation delivering complex projects within the utilities and infrastructure sector.Principal Mechanical Engineer roles and responsibilities Lead the design, specification, and delivery of mechanical engineering solutions across projects and proposals. Manage and supervise Mechanical Engineers, ensuring high-quality output and adherence to project timelines. Produce and review technical documentation including specifications, calculations, drawings, and reports. Coordinate with multidisciplinary teams, suppliers, and clients to ensure efficient project delivery. Oversee procurement activities including requisitions, technical evaluations, and supplier engagement. Drive the development and implementation of company-wide engineering standards, procedures, and quality assurance processes. Provide technical leadership, mentoring, and support to engineering teams, including training and development. Participate in site visits, testing, commissioning, and client meetings as required.Principal Mechanical Engineer requirements Degree or equivalent qualification in Mechanical Engineering or a related discipline. Extensive ex... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-bristol-morson-edge--c9ab2005-ea0c-4abc-aa2f-e9723da07e9a https://jobs.co.uk/job/principal-mechanical-engineer-bristol-morson-edge--c9ab2005-ea0c-4abc-aa2f-e9723da07e9a Mon, 20 Apr 2026 23:00:00 GMT Location: Bristol | Salary: Negotiable | Type: Permanent | Job Title: Principal Mechanical Engineer Location: Stoke Gifford, Bristol + Hybrid Working Arrangement Compensation: Competitive Salary + Benefits Role Type: Full time / Permanent As a Principal Mechanical Engineer, you''ll have a role that''s out of the ordinary. You''ll maintain the engineering configuration, ensuring the overall design intent and integrity is maintained throughout design lifecyc... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-psr-solutions--2b4abbbb-b28d-4233-9e90-3bd452bb5957 https://jobs.co.uk/job/principal-mechanical-engineer-psr-solutions--2b4abbbb-b28d-4233-9e90-3bd452bb5957 Sun, 19 Apr 2026 23:00:00 GMT Location: Bromsgrove | Salary: £60000 - £70000/annum Car / Car Allowance / Pension / Heal | Type: Permanent | Client information Our client is a well-established engineering organisation delivering complex projects within the utilities and infrastructure sector. Principal Mechanical Engineer roles and responsibilities * Lead the design, specification, and delivery of mechanical engineering solutions across projects and proposals. * Manage and supervise Mechanical Engineers, ensuring high-quality output and adherence to project timelines. * Produce and review technical documentation including specifications, calculations, drawings, and reports. * Coordinate with multidisciplinary teams, suppliers, and clients to ensure efficient project delivery. * Oversee procurement activities including requisitions, technical evaluations, and supplier engagement. * Drive the development and implementation of company-wide engineering standards, procedures, and quality assurance processes. * Provide technical leadership, mentoring, and support to engineering teams, including training and development. * Participate in site visits, testing, commissioning, and client meetings as required. Principal Mechanical Engineer requirements * Degree or equivalent qualification in Mechanical Engineering or a re... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-team-lead-mbda-uk--0686edca-d3c4-43cc-8826-7bbf8e149544 https://jobs.co.uk/job/principal-mechanical-engineer-team-lead-mbda-uk--0686edca-d3c4-43cc-8826-7bbf8e149544 Thu, 16 Apr 2026 23:00:00 GMT Location: Filton | Salary: Negotiable | Type: Permanent | We have an exciting opportunity for a Mechanical Design Engineer who possesses drive, enthusiasm, and both creative and logical thinking. This role involves leading a mechanical team within the Sparkworks portfolio of programmes, providing essential technical and management support to the team. Salary : Circa £ 60,000 depending on experience Dynamic (hybrid) working : 5 days per week on-site due to workload classification Security Clearance : British Citizen Restrictions and/or limitations relating to nationality and/or rights to work may apply. As a minimum and after offer stage, all successful candidates will need to undergo HMG Basic Personnel Security Standard checks (BPSS), which are managed by the MBDA Personnel Security Team. What we can offer you: Company bonus : Up to £2,500 (based on company performance and will vary year to year) Pension : maximum total (employer and employee) contribution of up to 14% Overtime: opportunity for paid overtime Flexi Leave: Up to 15 additional days Flexible working: We welcome applicants who are looking for flexible working arrangements Enhanced parental leave: offers up to 26 weeks for maternity, adoption and shar... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-carrington-west--2daf836b-3b4b-4041-83c4-0bf8f33d94cc https://jobs.co.uk/job/principal-mechanical-engineer-carrington-west--2daf836b-3b4b-4041-83c4-0bf8f33d94cc Thu, 16 Apr 2026 23:00:00 GMT Location: Warrington | Salary: £60000 - £80000/annum | Type: Permanent | Principal Mechanical Engineer - Nuclear & Green Energy Projects Location: UK-wide (Hybrid Working Available) Hours: 37-hour working week Clearance Required: British Nationals only (BPSS minimum) Are you a highly skilled Principal Mechanical Engineer with a background in regulated industries? Are you ready to make a real impact on innovative green energy and nuclear defence projects? Our client is a leading consultancy in the Nuclear and Defence sector, delivering high-profile projects across the UK. Known for their commitment to staff development, cutting-edge work, and long-term career opportunities, they offer a dynamic and forward-thinking environment for ambitious engineers. Why Join This Team? ·Be part of landmark government projects with a strong mechanical engineering focus ·Continuous professional development with support for further qualifications ·Flexible hybrid working and a comprehensive benefits package ·Join a collaborative, high-performing team that values innovation Key Responsibilities: ·Lead and uphold engineering standards and procedures across all technical activities ·Collaborate with clients to understand and deliver on mechanical requirements ·... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-advance-trs--559ea8e8-f68e-4db2-9b3f-201b527586b8 https://jobs.co.uk/job/principal-mechanical-engineer-advance-trs--559ea8e8-f68e-4db2-9b3f-201b527586b8 Wed, 15 Apr 2026 23:00:00 GMT Location: Bristol | Salary: £60000 - £70000/annum | Type: Permanent | Principal Mechanical Engineer - Water Sector Bristol, Exeter or Cardiff Hybrid 2-3 days per week -60-70k + excellent benefits Advance TRS are partnering with a global engineering consultancy who are looking for a Principal Mechanical Engineer. With AMP8 driving major change, this is your opportunity to lead meaningful projects that tackle climate and environmental challenges head-on. What you''ll do: Lead mechanical design across the full project lifecycle-from concept to construction Deliver innovative solutions for water & wastewater treatment, pumping stations, and infrastructure Collaborate with multidisciplinary teams, clients, and contractors Mentor and support the next generation of engineers What you''ll bring: Degree in Mechanical Engineering (or similar), ideally Chartered or working toward it Strong experience in detailed design within the water sector A collaborative mindset and passion for sustainable engineering Why join us? Award-winning workplace & global sustainability leader Flexible working options to suit your lifestyle Competitive salary, private medical cover, pension & more Industry-leading training, develo... Permanent https://jobs.co.uk/job/senior-principal-mechanical-engineer-ecm-selection-holdings-limited--fa33c9d2-275c-404a-9e6b-0cea5eb3d55f https://jobs.co.uk/job/senior-principal-mechanical-engineer-ecm-selection-holdings-limited--fa33c9d2-275c-404a-9e6b-0cea5eb3d55f Tue, 14 Apr 2026 23:00:00 GMT Location: Cambridge | Salary: £55000 - £70000/annum DoE + Benefits | Type: Permanent | Leading the development of complex electromechanical medical devices Cambridge;-to -70k DoE + benefits Leading the design and transition to manufacture of complex electromechanical medical devices, this role will involve you in managing development projects, and helping steer technical direction. Your remit will include requirements capture, progress reporting, and issue resolution, so you can expect frequent contact with clients, and of course you will have an eye out for future business opportunities. You''ll be leading multidisciplinary development teams as well as having direct engineering input to help deliver finished solutions.- Tasks may include innovative product design, problem solving, prototyping, supporting transfer to manufacture, and managing suppliers. The role is on-site in the company''s Cambridge offices with occasional visits to clients and manufacturers expected. Some home working may be possible for part of the week, where project work permits. You will need: A 1st or 2.1 degree in mechanical engineering, or a similarly applicable subject. Excellent designing, prototyping, and testing skills, demonstrated by having successfully taken multiple produ... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-building-services-thomas-search--a45ca0d0-e061-4f95-909e-cbe34e63b062 https://jobs.co.uk/job/principal-mechanical-engineer-building-services-thomas-search--a45ca0d0-e061-4f95-909e-cbe34e63b062 Mon, 13 Apr 2026 23:00:00 GMT Location: Winchester | Salary: £60000 - £65000/annum | Type: Permanent | Principal Mechanical Engineer | Building Services   Thomas Search are partnered with a leading, forward-thinking Mutli - disciplinary consultancy to appoint a Principal Mechanical Design Engineer into their expanding South-East Building Consultancy team This is an opportunity for a Principal Mechanical Building Services Engineer who wants to operate at the technical and professional core of project delivery.   You''ll be joining an established MEP design team delivering work across a wide and balanced project portfolio , spanning residential, regeneration, healthcare, education, and commercial sectors. The role is design-led, client-facing, and suited to an engineer who is confident taking responsibility for outcomes, as well as a desire to lead projects, mentor junior members and ambition to succeed.   Working within a multi-disciplinary environment, you''ll lead mechanical design packages, manage your own workload, and contribute to the successful delivery of projects from early concept through detailed design and construction support.   The role will involve: Leading mechanical services design on building projects Acting as lead engineer within design t... Permanent https://jobs.co.uk/job/senior-principal-mechanical-engineer-kintec-global-recruitment--dfe48a46-1970-458b-a4fd-6d9931635eeb https://jobs.co.uk/job/senior-principal-mechanical-engineer-kintec-global-recruitment--dfe48a46-1970-458b-a4fd-6d9931635eeb Sun, 12 Apr 2026 23:00:00 GMT Location: Manchester | Salary: Negotiable | Type: Permanent | Senior / Principal Mechanical Engineer (Water) Working Location: UK (Hybrid) Key Responsibilities: - Deliver mechanical design outputs in line with safety and quality requirements - Produce calculations, drawings, and technical documentation - Lead coordination with CAD technicians and support their development - Manage interfaces with subcontract design teams (including M&E) - Prepare scopes and review third-party design outputs - Engage with suppliers, review tenders, and support equipment selection - Produce reports, specifications, and design investigations - Ensure compliance with relevant standards and engineering practices - Manage design changes and ensure accurate documentation - Support estimation and planning of design activities - Attend and present at technical and client meetings Requirements: - Experience in mechanical design within the UK water sector - Exposure to both clean water and wastewater projects (infrastructure and non-infrastructure) - Experience with hydraulic design and associated calculations - Knowledge of schemes such as UMON or similar upgrade programmes - Understanding of construction methods and engineering drawing practices - Chartered Enginee... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-hays--0d686c3e-2fbf-4b40-9a09-67e400e0d4a6 https://jobs.co.uk/job/principal-mechanical-engineer-hays--0d686c3e-2fbf-4b40-9a09-67e400e0d4a6 Wed, 08 Apr 2026 23:00:00 GMT Location: Epsom | Salary: £80,000 | Type: Permanent | Your new company A well-established, multi-disciplinary building services consultancy is looking to appoint a Principal Mechanical Engineer to lead and grow their mechanical capability from their Epsom office. This is a senior technical and leadership role, suited to an experienced engineer who enjoys owning projects, mentoring engineers, and playing a visible role in client delivery. Your new role ... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-reevr--38ee50c4-ddd7-4842-bc39-56cf3136ff9f https://jobs.co.uk/job/principal-mechanical-engineer-reevr--38ee50c4-ddd7-4842-bc39-56cf3136ff9f Tue, 07 Apr 2026 23:00:00 GMT Location: Nuneaton | Salary: £60,000 | Type: Permanent | We are partnering with a leading global industrial solutions company to recruit a Principal Mechanical Engineer for their UK operations. The client specialises in advanced chemical and manufacturing solutions for sectors such as metals, automotive, aerospace, and industrial engineering. This is a senior technical role offering the chance to lead mechanical engineering projects, mentor teams, and op... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-vvb-engineering-uk-limited--a763fcf9-c234-46cc-a2ae-008ba4f9b881 https://jobs.co.uk/job/principal-mechanical-engineer-vvb-engineering-uk-limited--a763fcf9-c234-46cc-a2ae-008ba4f9b881 Thu, 02 Apr 2026 23:00:00 GMT Location: City of London | Salary: £95,000 | Type: Permanent | Join VVB: Where Quality and Excellence meet Are you ready to be part of a team that delivers top-notch mechanical, electrical, and telecommunication engineering solutions? Look no further than VVB, where expertise and experience converge to create sustainable solutions across Rail, Highways, Power, and Tunnels. At VVB, we''re more than just engineers - we''re collaborators, innovators, and stewards of... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-skilled-careers--950192f5-1bf8-4f2f-af1a-da008f79e704 https://jobs.co.uk/job/principal-mechanical-engineer-skilled-careers--950192f5-1bf8-4f2f-af1a-da008f79e704 Thu, 02 Apr 2026 23:00:00 GMT Location: Bristol | Salary: £55000 - £70000/annum | Type: Permanent | Principal Mechanical Engineer – Building Services Bristol (Hybrid) An exciting opportunity has arisen for a Principal Mechanical Engineer to join a forward-thinking consultancy in Bristol , with a strong focus on sustainable and low-carbon design. This is a fantastic opportunity to take a lead role on projects from concept through to delivery, working across a diverse portfolio of new-build and refurbishment schemes. You’ll be instrumental in driving innovative, energy-efficient solutions while working closely with clients and multidisciplinary teams. The Role Lead mechanical design across a range of building services projects Deliver projects from concept through to completion Drive low-carbon and sustainable design solutions Manage client relationships and contribute to project strategy Mentor and support junior engineers Collaborate with multidisciplinary teams to ensure high-quality delivery About You Degree qualified in Mechanical or Building Services Engineering Strong consultancy background with experience leading projects Proven experience across multiple RIBA stages Passion for sustainable and low-carbon... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-preston-morson-edge--647aec82-601a-45e9-96e2-8925f96973d3 https://jobs.co.uk/job/principal-mechanical-engineer-preston-morson-edge--647aec82-601a-45e9-96e2-8925f96973d3 Wed, 01 Apr 2026 23:00:00 GMT Location: Preston | Salary: Negotiable | Type: Permanent | Job Title: Principal Mechanical Engineer Location: Preston, Lancashire + Hybrid Working Arrangement Compensation: Competitive Salary + Benefits Role Type: Full time / Permanent / 37 hours per week As a Principal Mechanical Engineer, you''ll have a role that''s out of the ordinary. You''ll maintain the engineering configuration, ensuring the overall design intent and integrity is maintained thro... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--d406052f-ea67-4485-b073-11d070706eca https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--d406052f-ea67-4485-b073-11d070706eca Wed, 01 Apr 2026 11:53:27 GMT Location: Chelmsford | Salary: 70.00-70.00 Hourly | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems.The holder will themselves be a subject matter expert in at least one area of Mechanical Engineering, for example, Computational Fluid Dynamics, Finite Element Analysis, Structures or Thermal Systems. They may also hold Mechanical Design Authority for the Future Radar Products.Experience and knowledge of the design, build, test and use of composite structural materials is essential.Familiarity with the use of relevant modelling and simulation tools for analysis of structure behaviours under static and dynamic load, shock and vibration is essentialExperience and knowledge of the design and implementation of mechanical systemsFamiliarity with the content, applicability and use of relevant Standards is highly desirableExperience and knowledge of engineering lifecycles from requirements capture and derivation to in-service support is highly desirable.Typical... Contract https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--0f80cbc6-490f-4e73-aeea-db3e13a31ef0 https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--0f80cbc6-490f-4e73-aeea-db3e13a31ef0 Wed, 01 Apr 2026 11:53:27 GMT Location: Portsmouth | Salary: 70.00-70.00 Hourly | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems.The holder will themselves be a subject matter expert in at least one area of Mechanical Engineering, for example, Computational Fluid Dynamics, Finite Element Analysis, Structures or Thermal Systems. They may also hold Mechanical Design Authority for the Future Radar Products.Experience and knowledge of the design, build, test and use of composite structural materials is essential.Familiarity with the use of relevant modelling and simulation tools for analysis of structure behaviours under static and dynamic load, shock and vibration is essentialExperience and knowledge of the design and implementation of mechanical systemsFamiliarity with the content, applicability and use of relevant Standards is highly desirableExperience and knowledge of engineering lifecycles from requirements capture and derivation to in-service support is highly desirable.Typical... Contract https://jobs.co.uk/job/principal-mechanical-engineer-matchtech--00577eae-ac7a-44bd-bf89-da1e72f4084c https://jobs.co.uk/job/principal-mechanical-engineer-matchtech--00577eae-ac7a-44bd-bf89-da1e72f4084c Wed, 01 Apr 2026 11:53:27 GMT Location: Cowes | Salary: 51.86-51.86 Hourly | Type: Contract | Our client, a leading entity in the Defence and Security sector, is seeking a Principal Mechanical Engineer on a contract basis to join their esteemed team. This role is pivotal to their operations across multiple locations, including Cowes, Great Baddow, and Broad Oak.Key Responsibilities:Lead mechanical engineering projects, ensuring timely and effective delivery of solutions.Develop and review detailed mechanical designs, specifications, and documentation.Provide technical guidance and mentorship to junior engineers.Coordinate with cross-functional teams to integrate mechanical systems within defence and security projects.Ensure compliance with industry standards and regulations, including BPSS and ITAR.Conduct risk assessments and implement mitigation strategies.Liaise with clients to understand project requirements and deliver accordingly.Job Requirements:Experience as a mechanical engineer within the defence sector.In-depth knowledge of mechanical engineering principles and practices.Proficiency in mechanical design tools and software.Strong problem-solving and analytical skills.Ability to work on-site for four days a week at specified locations.Understanding of BPSS and SC i... Contract https://jobs.co.uk/job/senior-principal-mechanical-engineer-rgb--30ac9a4c-2cef-4323-a807-6225afcad085 https://jobs.co.uk/job/senior-principal-mechanical-engineer-rgb--30ac9a4c-2cef-4323-a807-6225afcad085 Wed, 01 Apr 2026 11:50:04 GMT Location: Bristol | Salary: £48000 - £65000 per annum | Type: Permanent | Senior / Principal Mechanical Engineer ?? Bristol (Hybrid – 3 days office / 2 days home) ------------------------- The Opportunity I’m currently working with a growing and design-led building services consultancy looking to appoint a Senior / Principal Mechanical Engineer to support the delivery of a strong and diverse project portfolio across the South West. This is a key hire within a close-knit team, offering genuine influence over project delivery, client relationships, and the future direction of the business. ------------------------- The Role You will take a leading role in the design and delivery of mechanical building services across sectors including commercial, residential, education, and retail. Working closely with senior leadership and clients, you’ll play both a technical and strategic role within the business. Key responsibilities include: - Leading mechanical design from concept through to detailed design - Delivering HVAC, public health, and low-carbon system solutions - Producing and reviewing calculations, specifications, and technical reports - Managing and coordinating Revit/BIM design outputs - Supporting energy modelling and sustainab... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-morson-edge--c6133d4f-4bce-42f9-b725-ddaf0dc6a816 https://jobs.co.uk/job/principal-mechanical-engineer-morson-edge--c6133d4f-4bce-42f9-b725-ddaf0dc6a816 Tue, 31 Mar 2026 23:00:00 GMT Location: Cowes | Salary: £51.86 - 70.00 per hour | Type: Contract | This role is for 2 Principal Mechanical Engineers to support BAE Systems on a next generation Radar Programme. Based out of their sites in Cowes, Great Baddow or Broad Oak. £70 per hour Umbrella - inside IR35 4 days onsite initially to start, then 2-3 days a week onsite when embedded. Can be at either 3 sites closest to home. 6 month contract - likely extension Job spec: The Principal Mechanical En... Contract https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--688a6c5a-27f6-4fe4-8c19-18e316fe0d70 https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--688a6c5a-27f6-4fe4-8c19-18e316fe0d70 Tue, 31 Mar 2026 23:00:00 GMT Location: Chelmsford | Salary: Up to £70.00 per hour | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems. The holder will themselves be a subject matter expert in at least ... Contract https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--72043ea2-fbfe-40d3-ac53-1afdc2ea4c01 https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--72043ea2-fbfe-40d3-ac53-1afdc2ea4c01 Tue, 31 Mar 2026 23:00:00 GMT Location: Portsmouth | Salary: Up to £70.00 per hour | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems. The holder will themselves be a subject matter expert in at least ... Contract https://jobs.co.uk/job/seniorprincipal-mechanical-engineer-hays-construction-and-property--14e2068c-d0bf-4c6f-a0d8-025ae25e46b4 https://jobs.co.uk/job/seniorprincipal-mechanical-engineer-hays-construction-and-property--14e2068c-d0bf-4c6f-a0d8-025ae25e46b4 Tue, 31 Mar 2026 11:52:48 GMT Location: Gloucestershire | Salary: 55000.00-55000.00 Annual | Type: Permanent | Your New CompanyHays Building Services are pleased to be assisting an award-winning consultancy with the recruitment of a Senior/Principal Mechanical Design Engineer based in Bristol.Your New RoleYou will be responsible for working with clients to create building services design solutions across a range of sectors, working on varied projects both regional and national at all stages of design, from survey and feasibility to detailed design and onto-site.You will attend meetings with clients and on site as required, ensure projects are delivered to quality standards, project time scales, within budget and to client satisfaction, as well as ensure that the design and maintenance of building systems meets legislative and health and safety requirements.What You''ll Need To SucceedYou will be an experienced Mechanical Design Engineer with a proven track record of successfully delivering UK building services projects and be able to demonstrate familiarity with RIBA work stages and associated duties along with maintaining the highest standards of CDM, health and safety, conduct and quality awareness.What You''ll Get In ReturnThis role is being offered with a salary between 55,000 - 65,000 ... Permanent https://jobs.co.uk/job/seniorprincipal-mechanical-engineer-hays--beea709d-7ef8-42db-b3f8-388a09803270 https://jobs.co.uk/job/seniorprincipal-mechanical-engineer-hays--beea709d-7ef8-42db-b3f8-388a09803270 Mon, 30 Mar 2026 23:00:00 GMT Location: Bristol | Salary: £65,000 | Type: Permanent | Your New Company Hays Building Services are pleased to be assisting an award-winning consultancy with the recruitment of a Senior/Principal Mechanical Design Engineer based in Bristol. Your New Role You will be responsible for working with clients to create building services design solutions across a range of sectors, working on varied projects both regional and national at all stages of design, from... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-matchtech--c48508c7-d864-4b57-add8-bfa78afb1505 https://jobs.co.uk/job/principal-mechanical-engineer-matchtech--c48508c7-d864-4b57-add8-bfa78afb1505 Mon, 30 Mar 2026 23:00:00 GMT Location: Cowes | Salary: £51.86/hour | Type: Contract | Our client, a leading entity in the Defence & Security sector, is seeking a Principal Mechanical Engineer on a contract basis to join their esteemed team. This role is pivotal to their operations across multiple locations, including Cowes, Great Baddow, and Broad Oak. Key Responsibilities: Lead mechanical engineering projects, ensuring timely and effective delivery of solutions. Develop and review detailed mechanical designs, specifications, and documentation. Provide technical guidance and mentorship to junior engineers. Coordinate with cross-functional teams to integrate mechanical systems within defence and security projects. Ensure compliance with industry standards and regulations, including BPSS and ITAR. Conduct risk assessments and implement mitigation strategies. Liaise with clients to understand project requirements and deliver accordingly. Job Requirements: Experience as a mechanical engineer within the defence sector. In-depth knowledge of mechanical engineering principles and practices. Proficiency in mechanical design tools and software. Strong problem-solving and analytical skills. Ability to work on-site for four days a week at specified locatio... Contract https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--a1535e04-8f3d-46b1-afa7-97bbe5d2c539 https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--a1535e04-8f3d-46b1-afa7-97bbe5d2c539 Mon, 30 Mar 2026 23:00:00 GMT Location: Portsmouth | Salary: £70.00/hour | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems. The holder will themselves be a subject matter expert in at least one area of Mechanical Engineering, for example, Computational Fluid Dynamics, Finite Element Analysis, Structures or Thermal Systems. They may also hold Mechanical Design Authority for the Future Radar Products. Experience and knowledge of the design, build, test and use of composite structural materials is essential. Familiarity with the use of relevant modelling and simulation tools for analysis of structure behaviours under static and dynamic load, shock and vibration is essential Experience and knowledge of the design and implementation of mechanical systems Familiarity with the content, applicability and use of relevant Standards is highly desirable Experience and knowledge of engineering lifecycles from requirements capture and derivation to in-service support is highly desi... Contract https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--eb0f4af1-c20d-4298-9148-6ff3e7f1798b https://jobs.co.uk/job/principal-mechanical-engineer-jam-recruitment-ltd--eb0f4af1-c20d-4298-9148-6ff3e7f1798b Mon, 30 Mar 2026 23:00:00 GMT Location: Chelmsford | Salary: £70.00/hour | Type: Contract | The Principal Mechanical Engineer is a key role that leads the mechanical engineering aspects of the development of new radar technologies. Reporting to the Project Engineering Manager, this role must have an expert general mechanical knowledge with experience in the design, build, integration and test of complex mechanical systems. The holder will themselves be a subject matter expert in at least one area of Mechanical Engineering, for example, Computational Fluid Dynamics, Finite Element Analysis, Structures or Thermal Systems. They may also hold Mechanical Design Authority for the Future Radar Products. Experience and knowledge of the design, build, test and use of composite structural materials is essential. Familiarity with the use of relevant modelling and simulation tools for analysis of structure behaviours under static and dynamic load, shock and vibration is essential Experience and knowledge of the design and implementation of mechanical systems Familiarity with the content, applicability and use of relevant Standards is highly desirable Experience and knowledge of engineering lifecycles from requirements capture and derivation to in-service support is highly desi... Contract https://jobs.co.uk/job/seniorprincipal-mechanical-engineers-adler-allan-ltd--cdc847a7-b781-4870-a5e9-bcf67a5e350c https://jobs.co.uk/job/seniorprincipal-mechanical-engineers-adler-allan-ltd--cdc847a7-b781-4870-a5e9-bcf67a5e350c Sat, 28 Mar 2026 00:00:00 GMT Location: Warrington | Salary: Negotiable | Type: Permanent | Job Description Location: Hybrid working with 2-3 days per week in United Utilities Lingley Mere office. Site visits as required. Permanent full-time(40 hours) Competitive salary plus benefits We are seeking Mechanical Engineers with extensive experience and understanding of sewage treatment processes and the equipment/system requirements. What this role requires: Extensive experience and understandin... Permanent https://jobs.co.uk/job/principal-mechanical-engineer-morson-edge--df102467-73ad-45cf-bf54-1623e2d86d7e https://jobs.co.uk/job/principal-mechanical-engineer-morson-edge--df102467-73ad-45cf-bf54-1623e2d86d7e Wed, 25 Mar 2026 00:00:00 GMT Location: Manchester | Salary: £55 - 58 per hour + None | Type: Contract | Our client has won a significant Project to deliver Utilities updates and Improvements at a major Nuclear site. Duties will include the completion of detailed design and all procurement, installation, construction, commissioning and handover activities that form part of the contract delivery. Utilities involved:- Steam (LP and HP) Water (Wastewater, Raw, Domestic and Demin) Compressed air Bulk che... Contract