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Mechanical Services
Building services and mechanical installations designed for performance, reliability and long-term efficiency across education, healthcare, commercial and industrial sectors.
Welcome to
Dominic O'Connor Ltd
Engineering. Better.
Mechanical services and decarbonisation solutions for education, healthcare, commercial and industrial buildings across Ireland.
Mechanical Services
Decarbonisation
Maintenance
Who We Are
Engineering Expertise.
Engineering Expertise.
Practical Solutions.
Founded in 1999, Dominic O'Connor Ltd has grown from a Midlands mechanical contractor into a nationwide engineering business, delivering over 500 projects across education, healthcare, commercial and industrial sectors.
We combine deep technical expertise with a straightforward, no-nonsense approach — getting mechanical systems installed, upgraded and maintained properly, on programme, in live and demanding environments.
Learn More About Us →
What We Do
Our Core Services
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Decarbonisation
Future-proofing buildings through energy-efficient upgrades, heat pump installations, retrofitting and low-carbon solutions that reduce running costs and emissions.
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Maintenance
Planned and reactive maintenance services that keep mechanical systems performing at their best, minimising downtime and extending asset life.
Our Work
Featured Projects
A selection of recent mechanical and decarbonisation projects delivered for public bodies, main contractors and direct clients.
Why Choose Us
Trusted By Clients Across Ireland
25+
Experience
Over 25 years delivering mechanical services across Ireland's built environment.
500+
Delivery
A consistent track record of on-programme delivery in live, operational environments.
CIBSE
Expertise
Accredited engineers across HVAC, medical gases, BMS and renewable heating systems.
100%
Partnership
Long-term relationships with main contractors, public bodies and direct clients.
Decarbonisation
Supporting Ireland's Decarbonisation Journey
As a Pathfinder Programme partner, we deliver heat pump retrofits, fabric upgrades and low-carbon heating solutions that measurably reduce energy use and emissions in schools and public buildings.
- Pathfinder Programme participant
- Proven energy use reductions
- Low-carbon heating solutions
- Building performance improvements