Job Description
Overview of role
This is an opportunity for a Senior Mechanical Design Engineer who wants to work at the forefront of decarbonisation and sustainable retrofit within the built environment. Youll play a key role in shaping low-carbon energy solutions for commercial and public-sector buildings, working from early feasibility through to construction and commissioning. Youll be trusted to lead technical delivery, influence design decisions, and collaborate closely with clients and multidisciplinary teams to deliver practical, high-quality, and future-ready engineering solutions.
Role responsibilities and requirements
Lead and deliver mechanical building services designs for decarbonisation and retrofit projects, including heat pumps, low-temperature heating, high-efficiency HVAC, heat recovery, thermal storage, and smart controls. Take ownership of detailed mechanical design across RIBA Stages 25, producing calculations, schematics, equipment selections, schedules, and technical reports. Coordinate closely with electrical and other disciplines to ensure fully integrated solutions. Support and contribute to energy modelling and system performance analysis using tools such as IES. Lead mechanical design packages on multidisciplinary projects, ensuring quality, compliance, and buildability. Review, QA, and sign off designs in line with CIBSE guidance, UK Building Regulations, and relevant standards. Engage confidently with clients and contractors, contributing to technical discussions, design reviews, and presentations. Support design risk management, HAZOP/LOPA reviews where required, and overall project delivery.
Key skills and qualities needed
Degree in Mechanical Engineering or Building Services Engineering (or equivalent). Chartered Engineer (CEng) status or actively working towards chartership.
Strong background in mechanical building services design within the built environment. Proven experience delivering low-carbon, energy efficiency, and sustainable retrofit projects. Hands-on experience with heat pump systems, hybrid solutions, and low-temperature heating design. Comfortable working across the full RIBA stages within multidisciplinary teams. Familiarity with public-sector or funding-driven decarbonisation programmes (e.g. PSDS, SHDF). Confident communicator who enjoys mentoring junior engineers and collaborating with stakeholders. Organised, commercially aware, and motivated by delivering meaningful environmental impact.
Further information
This role is well suited to an engineer looking to take ownership of technically challenging projects, develop their leadership capability, and contribute directly to the transition to a low-carbon built environment. Alongside a very attractive package you will expect excellent career development opportunities and a dynamic and encouraging work culture.
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