Permanent

Mechanical Design Engineer

RGB
Southampton, SO14 7DW
money-bag £28000 - £50000 per annum
Posted: 24 September 2026 (Today)
Closing date: 24 October 2026
Ref: 106278

About the Role

RGB seeks a Mechanical Design Engineer in Southampton for a permanent post, paying £28,000 to £50,000 yearly. The appointed engineer joins a consultancy delivering mechanical building services, energy management and sustainability advice. Duties cover design and technical solutions for new-build developments, refurbishment schemes, plant replacement and efficiency initiatives. The role involves working with end users, construction professionals and installing contractors, so sound communication and teamwork matter. Applicants should hold relevant engineering knowledge, ideally within building services, plus familiarity with system optimisation and effective building operation. This position suits someone keen to develop within a consultancy focused on sustainability and performance.

Mechanical Design Engineer (Building Services)
Location: Southampton Area
Salary: £28,000 - £50,000
The Company
An established sustainability and building services design consultancy based in the Southampton area, is looking to appoint a Mechanical Design Engineer to join its growing team.
They provide mechanical building services engineering, energy management and sustainability consultancy services across a wide range of projects. Working with end users, construction professionals and installing contractors, the consultancy delivers design and technical solutions for new-build developments, refurbishment projects, plant replacement schemes and energy efficiency initiatives.
With a strong focus on energy efficiency, system optimisation and effective building operation, the business supports clients in reducing energy consumption, carbon emissions and operating costs.
The consultancy''s services include building services design, energy audits, net zero carbon strategies, carbon reporting, utility management and technical investigations.
The Role
This role is suitable for a Mechanical Design Engineer looking to develop their career within a supportive and technically focused environment. You will work on a range of projects across different market sectors, supporting both client-side assignments and design and build contracts for contractors.
You will be involved in projects from initial concept and feasibility stages through to detailed design and the production of technical documentation. The role offers exposure to a broad range of mechanical building services systems, with opportunities to develop your technical knowledge and project experience.
Key Responsibilities
- Assist with and undertake mechanical building services design across a range of projects.
- Support site surveys, investigations and technical assessments.
- Design and develop low-temperature hot water heating systems.
- Work on domestic hot and cold water services.
- Contribute to mechanical and natural ventilation design.
- Support the design of refrigerant and chilled water cooling systems.
- Contribute to low and zero-carbon technology design solutions.
- Undertake above-ground drainage design.
- Produce technical design drawings using AutoCAD.
- Assist with design specifications, performance specifications, equipment schedules and technical submissions.
- Complete design calculations using relevant industry software packages.
- Support feasibility studies, condition surveys and technical investigations.
- Contribute to project delivery and work collaboratively with the wider design team.
Candidate Requirements
- Experience or a relevant background in mechanical building services engineering.
- An understanding of mechanical building services design principles.
- Competency in AutoCAD (essential).
- The ability to work both independently and as part of a wider design team.
- Strong attention to detail and a commitment to delivering high-quality work.
- Good IT skills, including Microsoft Office.
- A willingness to develop technical knowledge and take on new responsibilities.
- A full UK driving licence (essential).
What’s on Offer£
- Competitive salary and benefits package.
- 25 days'' annual leave, rising to 30 days after 3 years.
- 40-hour working week with flexible working available.
- Private healthcare.
- Training and professional development opportunities.
- Staff perks and incentives.
- Access to a wellbeing platform.
- Shopping discounts and offers.
- Performance bonus.
- Company social events.
- Free on-site parking.
How to Apply
If you''re interested, please contact Conner Richards at RGB

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