Principal Mechanical Design Engineer – Building Services

Principal Mechanical Design Engineer

London | £70,000 + Car Allowance + Travel Paid | Major Projects | Building Services

A leading MEP contractor is seeking a Principal Mechanical Design Engineer to join a well-established and growing electrical design team in London. This is a senior technical appointment within a delivery-focused, contractor-led environment operating across some of the UK's most complex building services projects.

The design team consists of approximately 25 engineers, supported by a strong secured pipeline of work providing at least two years of forward workload visibility.

You will take a leading role in delivering electrical design across multiple high-value projects through RIBA Stages 1-5, combining technical leadership, coordination, and hands‑on design oversight.

The current workload includes a major hyperscale data centre development (£400m+ core project value), forming a flagship scheme within the business, alongside a strong portfolio of complex commercial, institutional, and mixed‑use developments across London.

Live and upcoming project portfolio includes:

• Large-scale urban redevelopment scheme within a key central London regeneration zone, involving multiple mixed‑use assets
• Over‑site development above major transport infrastructure in a prime central London location
• High‑profile commercial development at a major central London address
• Significant works at a nationally recognised cultural institution involving sensitive refurbishment and infrastructure upgrade
• Major capital programme within a leading UK higher education campus involving phased redevelopment and expansion works
• Hyperscale data centre programme with mission‑critical electrical infrastructure and high resilience requirements

This is a highly design‑led contractor environment where engineers are trusted with real ownership, technical responsibility, and direct client engagement.

• Lead Mechanical design delivery across multiple concurrent major projects
• Manage design development from early concept through detailed design and construction stages (RIBA 1-5)
• Provide technical leadership, mentoring
• Coordinate with internal disciplines, clients, and external consultants
• Support delivery of mission‑critical and large‑scale infrastructure environments
• Ensure compliance with relevant UK regulations, standards, and client requirements
• Contribute to design optimisation, value engineering, and technical innovation

• Circa £70,000 basic salary
• Car allowance
• All travel expenses covered
• Strong forward workload (2+ years secured pipeline)
• Exposure to landmark UK developments and major infrastructure schemes
• Long‑term progression within a growing and stable design team

• Mechanical Engineer with strong building services design experience
• Proven experience delivering projects through RIBA Stages 1-5
• Background in consultancy or contractor design environment
• Experience working on large‑scale commercial, infrastructure, or mission‑critical projects
• Data centre experience highly advantageous
• Strong leadership, coordination, and stakeholder management skills

This is an opportunity to join a stable and expanding design function delivering some of the UK's most technically challenging and high‑value projects, including a significant presence in the data centre and major infrastructure sector. You'll have autonomy, responsibility, and the chance to influence design delivery at a senior level across a secure long‑term pipeline.

Eden Brown is acting as an Employment Agency in relation to this vacancy