Principal / Associate Mechanical Engineer

Principal / Associate Mechanical Engineer | London | Hybrid Working | Building Services Consultancy

Salary: £70,000 - £85,000 + Bonus + Private Healthcare + Pension + Hybrid Working
Exceptional candidates seeking a higher package will also be considered.

Are you an experienced Mechanical Building Services Engineer looking for a role that combines technical leadership, client engagement, project delivery and genuine influence within a growing consultancy?

This is an opportunity to join a highly regarded, design-led building services consultancy that has built an impressive reputation for delivering technically robust, commercially focused engineering solutions across a diverse range of sectors.

Working alongside an experienced leadership team, you'll play a key role in project delivery, client management, technical oversight and mentoring junior engineers, whilst helping shape the continued growth of the business.

This role would suit a well-rounded engineer who enjoys being involved in every aspect of a project, from technical design and site inspections through to client advisory services, team management and business development.

The Opportunity

As the consultancy continues to expand, they are seeking a Principal or Associate Mechanical Engineer capable of leading projects, developing client relationships and acting as a senior technical figure within the business.

The successful candidate will have broad experience across building services consultancy and be comfortable operating both technically and commercially.

You'll work across a varied portfolio including:

Commercial offices
Workplace fit-outs
Healthcare facilities
Higher education projects
Student accommodation
Residential developments
Mixed-use schemes
Specialist technical environments
Beyond traditional MEP design, the business is regularly involved in:

Technical due diligence
Design management
Asset reviews
Building surveys
Construction-stage support
Decarbonisation projects
Occupier advisory services
Pre-acquisition and landlord / tenant technical assessments
As a result, this role offers exposure far beyond a typical mechanical design position.

What You'll Be Doing

As a Principal / Associate Mechanical Engineer, you will:

Lead the delivery of mechanical building services projects from feasibility through to completion.
Act as Lead Mechanical Engineer across multiple projects and sectors.
Manage client relationships and act as a trusted technical advisor.
Undertake mechanical design reviews and provide technical leadership across project teams.
Oversee technical due diligence, surveys, feasibility studies and building assessments.
Attend site inspections and construction reviews, ensuring designs are properly implemented.
Coordinate multidisciplinary design teams and manage project programmes.
Review calculations, reports, specifications and technical documentation.
Identify project risks and develop practical engineering solutions.
Mentor and support junior and intermediate engineers.
Assist with resource planning and project delivery management.
Contribute to business development, proposal preparation and client growth initiatives.
Work closely with company leadership in helping shape future business strategy.
What We're Looking For

Essential

Degree qualified in Mechanical Building Services Engineering or a related discipline.
Approximately 8+ years' experience within Building Services Consultancy.
Strong technical understanding of mechanical building services design.
Proven experience delivering projects across all RIBA stages.
Experience leading multidisciplinary project teams.
Strong client-facing and stakeholder management skills.
Experience attending site inspections, surveys and construction-stage activities.
Excellent report writing and communication skills.
Commercial awareness and understanding of project delivery processes.
Ability to manage multiple projects and priorities effectively.
Desirable

Chartered Engineer status or working towards Chartership.
Membership of CIBSE, IMechE or a similar professional body.
Experience within commercial office projects.
Exposure to healthcare, residential, education or mixed-use developments.
Experience undertaking technical due diligence and building surveys.
Contractor or client-side experience.
Why This Role Stands Out

Many Principal and Associate-level opportunities focus heavily on either technical design or management.

This position offers the opportunity to remain involved across all aspects of project delivery, including:

Technical design leadership
Client engagement
Site inspections and surveys
Strategic project advice
Team development
Business growth initiatives
Project delivery management
The consultancy operates with a lean structure, meaning senior engineers enjoy a level of visibility, influence and responsibility rarely available within larger organisations.

You'll have direct access to decision-makers and the opportunity to play a meaningful role in the future direction of the business.

Career Development & Progression

For ambitious engineers looking beyond a traditional Principal or Associate role, there is genuine scope for long-term progression.

You'll benefit from:

Direct collaboration with experienced company leaders.
Exposure to high-profile clients and technically challenging projects.
Significant autonomy and influence.
Opportunities to develop business leadership skills.
Involvement in strategic decision-making.
Clear progression towards Associate Director and beyond.
The business actively encourages senior staff to contribute ideas, challenge convention and help shape future growth.

Company Culture

The consultancy has built a collaborative and supportive environment where technical excellence, professionalism and trust form the foundation of project delivery.

Engineers are encouraged to take ownership, build strong client relationships and contribute beyond their immediate responsibilities.

The culture promotes:

High-quality engineering
Professional trust and autonomy
Collaboration and knowledge sharing
Strong client relationships
Continuous professional development
Entrepreneurial thinking
Long-term career growth
With direct access to leadership and a highly collaborative team environment, individuals have the opportunity to make a genuine impact on both projects and the wider business.

Package & Benefits

£70,000 - £85,000 salary depending on experience
Higher package considered for exceptional candidates
Annual discretionary bonus
Private healthcare
Pension contribution
25 days annual leave plus bank holidays
Hybrid working arrangement
Central London office location
Chartership support
Ongoing professional development
Clear progression opportunities
Direct access to senior leadership
Location & Working Pattern: Central London | Hybrid Working

The role offers a combination of office, home and project-based working. Employees typically attend the office around three days per week, alongside client meetings and site visits as required.

Interested?

This is an outstanding opportunity for a well-rounded Principal or Associate Mechanical Engineer seeking a role that combines technical leadership, client engagement, project delivery and genuine career progression within a growing consultancy.

If you're looking for a position where you can influence projects, mentor engineers, strengthen client relationships and play an active role in shaping a successful business, we'd be keen to hear from you
Only candidates based in UK and eligible to work in UK are allowed