Principal Mechanical Design Engineer in London, Greater London

Principal Mechanical Design Engineer – London (Hybrid) – £70k + £4.5k Travel Allowance

9‑Day Fortnight | Hybrid Working | L&D Support | Mission Critical Projects (Data Centres)

Ada Meher is partnered with a leading MEP Consultancy as they look to appoint a Principal Mechanical Engineer into their London office. This team delivers design‑led MEP solutions across RIBA Stages 2–4, working on some of the most technically demanding environments in the UK — from Data Centres and Science facilities to Airports, Stadiums, Retail, Commercial and Residential developments. This role is focused on large-scale Data Centre builds internationally.

You’ll be joining a business known for its structured progression pathways, strong L&D culture and collaborative engineering environment. The role is fully design‑focused, working closely with Mechanical, Electrical and Sustainability specialists to deliver high‑quality building services designs across a diverse project portfolio.

The consultancy operates a hybrid model, typically 2 days per week in the office though this depends on team requirements. You will also receive a £4,560 annual travel allowance on top of salary. As part of their commitment to work/life balance employees have the option to condense their hours into a 9‑day fortnight and making every other week 4 days long.

To Be Considered:

• Strong experience in Mechanical Design Engineering in the Building Services sector
• Data Centre design experience is essential
• Experience designing HVAC systems, cooling solutions, ventilation, air distribution and associated mechanical plant
• Background delivering MEP designs across RIBA Stages 2–4
• CIBSE accreditation or industry specific charterships would be a bonus
• Ability to lead projects, coordinate with multidisciplinary teams and mentor junior engineers
• Strong communication skills and confidence engaging with clients and internal stakeholders

This Principal Mechanical Engineer role is expected to attract significant interest, particularly given the project nature and progression structure. If you’d like to be considered, please send a CV or apply within to avoid missing out.