https://jobs.co.uk/job/lead-principal-mechanical-design-engineer-james-lewis-recruitment--ee90cfeb-ab9e-4e44-8dc7-a5ad66eac69d RSS feed for Lead / Principal Mechanical Design Engineer at James Lewis Recruitment. en-gb Tue, 26 May 2026 17:42:03 GMT https://jobs.co.uk/job/lead-principal-mechanical-design-engineer-james-lewis-recruitment--ee90cfeb-ab9e-4e44-8dc7-a5ad66eac69d https://jobs.co.uk/job/lead-principal-mechanical-design-engineer-james-lewis-recruitment--ee90cfeb-ab9e-4e44-8dc7-a5ad66eac69d Mon, 25 May 2026 23:00:00 GMT Location: City of London | Salary: £80000 - £90000/annum see ad | Type: Permanent | Senior Mechanical Design Engineer (Contractor-side) — Concept to RIBA Stage 4 London & South East | Commercial Fit Out | Main Contractor | Permanent A growing main contractor in the London and South East commercial office fit out market is strengthening its in-house design capability and is looking for a Senior Mechanical Design Engineer to lead from the front. Trading for 3.5 years and turning over circa £20m in 2026, the business has built its reputation quickly and now wants the right person to help shape how its mechanical design function develops. This is a contractor-side role with genuine ownership from feasibility and concept through to RIBA Stage 4 technical design. The focus is firmly on delivery: programme, procurement, installability, change control and margin. You will lead mechanical design across multiple projects, coordinate external consultants and design partners, and challenge outputs where needed, including reviewing IES, Revit and Hevacomp information. You will produce feasibility schemes and option studies to support pre-con decisions, and when budgets tighten you will lead value engineering conversations with confidence, presenting practical alternatives t... Permanent