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.

The Opportunity

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.

Key Responsibilities

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
Package

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
About You

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
Why Apply?

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