Principal Mechanical Design Engineer

Principal Mechanical Design Engineer

Final date to receive applications: 5 January 2026

Department: Design

Employment Type: Full Time

Location: Alternative Heat Head Office

Reporting To: Associate Director

The opportunity has arisen to join an industry leader in 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 offsite-prefabricated energy systems, we take pride in offering groundbreaking decarbonisation solutions throughout Ireland, UK and Europe.

As part of our mission to drive the transition to renewable and low‑carbon energy solutions, we are excited to announce an opportunity for a Principal Mechanical Design Engineer to join our team. This pivotal role will shape the future of sustainable energy delivery across a diverse portfolio of public and commercial sectors.

Team Overview: 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.

Role Overview: As a Principal Mechanical Design Engineer, you will play a key role within our growing Design Team, based at our Banbridge Head 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 |
Banbridge – Head Office

Hours |
Monday-Thursday 8am-5pm and Friday 8am-3pm

Salary |
Competitive Depending on Experience

Responsible 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 click on the link provided or reach out to Nicola Hyland (Senior Talent Acquisition Specialist) - Nic