Principal Mechanical Design Engineer
Alternative Heat
Company Overview
Alternative Heat Limited
HeadquartersBanbridge, United Kingdom
Founded2005
SizeApproximately 200 employees (source: endole.co.uk). Revenue of £46.9 million in FY 2024 (source: endole.co.uk).
What They Do
Alternative Heat focuses on offsite prefabricated mechanical, electrical, and plumbing (MEP) systems, specializing in decarbonization solutions through modern construction methods. With over 19 years of experience, the company has established itself as a market leader in commercial offsite fabrication, providing a range of services including design, fabrication, supply, installation, and commissioning of bespoke modular MEP solutions (source: growjo.com). Their offerings include renewable heating systems such as biomass boilers, ground source heat pumps, air source heat pumps, and solar panels, catering to domestic, commercial, and industrial applications. As an MCS-registered supplier, they ensure high standards in their products and services (source: zoominfo.com). The company operates from facilities equipped with advanced technology and ample workshop space, supported by a skilled workforce including design engineers and CAD technicians (source: growjo.com). Their target markets span the public and private sectors across the UK, Ireland, and Europe, focusing on scalable, high-quality turnkey projects that align with carbon reduction and net zero goals (source: youtube.com).
Projects & Track Record
Alternative Heat has built a robust portfolio of turnkey projects in the decarbonization and off-site modular MEP sectors, delivering solutions across Ireland, the UK, and Europe. While specific project names, capacities, or costs are not detailed in available records, the company emphasizes its commitment to continuous improvement and best-in-class delivery for both new and repeat clients (source: youtube.com). Their operations are supported by established supply chains and regional offices, including a significant operations hub in Scotland, which enhances their geographic reach (source: growjo.com). The company’s focus on prefabricated solutions positions it well for growth, as it serves clients pursuing net zero initiatives (source: youtube.com). However, detailed information on specific completed projects, such as named installations with MW capacities, is limited in the public domain, which restricts the ability to provide a comprehensive track record (source: rocketreach.co).
Recent Developments
In the financial year ending 31 March 2024, Alternative Heat reported a significant turnover increase to £46.9 million, marking a 48% rise from the previous year (source: endole.co.uk). Employee growth has also been notable, with numbers reaching approximately 206, reflecting a 37% increase (source: endole.co.uk). A promotional video released on 17 July 2025 highlighted the company's role in decarbonization and modular MEP, showcasing their scalable solutions and European reach (source: youtube.com). Corporate filings have included full accounts submitted for the year ending 31 March 2023, with updates on confirmation statements and changes in significant control details (source: endole.co.uk). However, there have been no major contracts, acquisitions, or awards reported in the last two years, indicating a focus on internal growth and operational stability (source: endole.co.uk).
Working There
Alternative Heat offers a variety of roles across multiple departments, including procurement, HR, finance, operations, health and safety, and legal, with department heads overseeing specialized teams (source: growjo.com). The company is led by Managing Director Connel McMullan, and hiring primarily occurs at their Banbridge headquarters and prefabrication sites, with a focus on regional opportunities in Scotland (source: rocketreach.co). The culture at Alternative Heat emphasizes expertise, innovation, and continuous improvement, with a commitment to safety and client satisfaction driving their operational ethos (source: growjo.com). While specific employee benefits are not documented, the company’s investment in facilities and technology has contributed to significant annual growth rates ranging from 26% to 37% (source: youtube.com).
Last updated on May 22, 2026 | Report an issue
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 Dublin 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.
What You'll be Doing
- 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) - [email protected]
Apply now
Job expired?Please let Alternative Heat know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
Apply now
Job expired?Please let Alternative Heat know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
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About the role
July 28, 2026
July 28, 2026
Full time
On-site
Company
Bioenergy, Energy Storage, Smart Grid
- Dublin, Ireland
UTC+00:00