Principal Mechanical Engineer

Principal Mechanical Engineer | London (Hybrid) 
Lead innovative, low-carbon building design with a clear path to Associate level 
Salary: £60,000 – £75,000 (dependent on experience) 

Are you an experienced Mechanical Engineer looking to take a leading role in the delivery of sustainable building projects? This is a brilliant opportunity to join a growing, design-led consultancy where your expertise will help shape technically ambitious, low-energy developments across a wide range of sectors. 

You will work in a collaborative team environment that values purposeful design, technical depth and a commitment to net zero. With a strong pipeline of work across science and research, education, residential, commercial and public buildings, this is a chance to make real impact and progress towards Associate level. 

What you will do 

As a Principal Mechanical Engineer, you will: 

• Lead mechanical design across projects from early concept through to completion 

• Coordinate closely with clients, architects and multidisciplinary teams 

• Mentor and support junior and mid-level engineers 

• Contribute to internal quality, design standards and knowledge sharing 

• Support business development activity and help shape project strategies 

• Design and deliver low-energy mechanical systems aligned with net zero goals 

What you will bring 

• Chartered Engineer (CEng) or working towards chartership with a recognised institution 

• Typically 8+ years’ experience in mechanical building services design within the UK 

• Proven ability to lead projects and coordinate across disciplines 

• Strong technical understanding of mechanical systems including HVAC, ventilation, thermal modelling and low-carbon technologies 

• Experience delivering projects across all RIBA stages 

• Confident leadership, communication and mentoring skills 

• A proactive, design-focused mindset with a passion for sustainable engineering 

Why this opportunity stands out 

This consultancy has built a reputation for delivering well-considered, sustainable designs in close collaboration with architects and clients. With a clear design philosophy, supportive culture and a strong growth trajectory, you’ll be joining a team where your contribution is valued and your progression is supported. 

There is a defined route to Associate level, backed by leadership support and an exciting project pipeline. 

What is on offer 

• Competitive salary: £60,000 – £75,000 depending on experience 

• 25 days annual leave 

• Enhanced employer pension contribution 

• Optional private healthcare cover 

• Cycle to work and electric vehicle purchase schemes 

• Death in service cover 

• Payment of one professional membership 

• Structured support for chartership and continued development 

• Hybrid working: 3 days in the office, 2 from home 

• Friendly, inclusive team with a purpose-led design culture 

If you're ready to take the next step in your career and lead mechanical design on impactful projects, we would love to hear from you. 

Apply now or contact David Hilditch at RGB Network for more information.