Principal Mechanical Design Engineer

Join to apply for the Principal Mechanical Design Engineer role at Alternative Heat Ltd

Final date to receive applications: 5 January 2026

Department: Design

Location: Birmingham

Description

The opportunity has arisen to join an industry leader in the UK's & Ireland's commercial decarbonisation sector. At Alternative Heat, we are at the forefront of innovative, sustainable building solutions. As a leader in the design, development, and delivery of off‑site prefabricated energy systems, we take pride in offering groundbreaking decarbonisation solutions throughout Ireland, the UK and Europe.

The Design department is responsible for developing innovative, practical, and fully coordinated mechanical and electrical services solutions tailored to each project. Working closely with clients, project teams and the BIM department, the design team transforms concepts into detailed, build‑ready technical designs that meet regulatory standards, client specifications and sustainability goals. Their work underpins the technical accuracy and efficiency of our installations, ensuring seamless integration from planning through to construction.

As a Principal Mechanical Design Engineer, you will play a key role within our growing Design Team, based at our Birmingham office. You’ll take ownership of mechanical designs from concept through to commissioning, working closely with fabrication, project management and commissioning teams to ensure seamless delivery. You’ll be involved in the design of commercial decarbonising solutions across a diverse portfolio of sectors, while also mentoring junior engineers and helping to shape best practice within the team.

Job Title: Principal Mechanical Design Engineer

Location: Birmingham Office, Solihull

Hours: Monday‑Thursday 8 am‑5 pm and Friday 8 am‑3 pm

Salary: Competitive, depending on experience

Reporting to: Head of Design

• Managing the design delivery for decarbonising a range of commercial projects.
• Delivering mechanical designs, including schematics, calculations, plant selections, bills of materials and project specifications.
• Developing and validating BMS control strategies, from design through to on‑site verification.

To apply, please contact Nicola Hyland (Senior Talent Acquisition Specialist) – Nic