Net Zero Evolution
Senior ASHP Mechanical Engineer
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Job Title: Senior Mechanical Engineer - ASHP Design
Location: Bristol hybrid, with local site visits and occasional UK travel
Why this role
You know that decarbonisation only works when good ideas become real, functioning systems. This is a chance to step into a senior mechanical engineering role where your designs will not sit on a shelf. They will shape live retrofit projects, cut carbon across public buildings, and help transform how heat is delivered in a major UK city.
This opportunity would suit a Mechanical Engineer or Building Services Engineer who has strong experience with air source heat pumps, particularly in retrofit environments, and who wants to play a visible part in the energy transition. You will join a growing engineering function with a strong pipeline of work, a practical culture, and the chance to influence how projects are designed, delivered, and improved over time.
What you’ll do
- Lead technical work across a wide range of decarbonisation and clean energy projects, with a strong focus on ASHP retrofit schemes in existing buildings
- Conduct site surveys, energy audits, feasibility studies, outline and detailed design, contractor scope development, design review, technical reporting, and client presentation
- Develop engineering solutions yourself, while also overseeing specialist consultants and subcontractors where needed
- Work on heating system design, pipe sizing, control philosophy, P&IDs, layouts, techno-economic analysis, energy modelling, and support through construction and commissioning
- Mentor junior engineers as the team continues to grow
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About the company
Our client is a well-established energy and infrastructure business delivering decarbonisation, energy efficiency, and renewable solutions across the UK and Europe. They work with complex estates in the public and private sectors, helping customers reduce cost, improve resilience, and move towards net zero.
What makes this role stand out is the scale of the opportunity. You will be joining at a point where there is a substantial pipeline of retrofit work ahead, particularly across Bristol-based buildings, with the backing to build stronger in-house technical capability over time.
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About you
- Solid experience in mechanical engineering, building services, or decarbonisation
- Proven knowledge of air source heat pump design in retrofit applications
- Confidence working across existing heating systems, reviewing constructability, challenging design assumptions, and supporting projects beyond paper design into delivery
- Practical, collaborative, and comfortable balancing technical detail with client-facing responsibility
- Experience with public sector frameworks is helpful, but the priority is strong ASHP and retrofit expertise
Rewards & growth
- Competitive salary and comprehensive benefits package
- Genuine long-term progression
- Chance to shape projects from concept to commissioning
- Build leadership experience and contribute to a growing team in one of the UK’s most important decarbonisation markets
How to apply
If you are ready to take ownership of meaningful ASHP retrofit and building decarbonisation projects, we would love to hear from you.
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