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Mechanical Services
Decarbonisation
Maintenance
Welcome to

Dominic O'Connor Ltd

Engineering. Better.
Delivering mechanical services, HVAC, plumbing and decarbonisation solutions across Ireland's education, healthcare, commercial and industrial sectors.
Clinical Education & Research
Doyle Shipping
Pallas Commercial
Aaran Chemicals
Rehab Group
CC Summerhill
Swords Education
UL Sports Arena
NUIG Residential
UCH Limerick

+

Years Experience

+

Projects Delivered

Nationwide

Coverage Across Ireland
Education · Healthcare · Commercial · Industrial
Sectors Served
Who We Are

Engineering Expertise.
Practical Solutions.

For over 25 years Dominic O'Connor Ltd has delivered mechanical engineering solutions that improve building performance, reliability and efficiency.
From schools and healthcare facilities to commercial and industrial environments, we combine technical expertise with practical delivery — on time, on budget, and built to last.
What We Do

Our Core Services

Mechanical Services
Building services and mechanical installations designed for performance, reliability and long-term efficiency across education, healthcare, commercial and industrial sectors.
Decarbonisation
Future-proofing buildings through energy-efficient upgrades, heat pump installations, retrofitting and low-carbon solutions that reduce running costs and emissions.
Maintenance
Planned and reactive maintenance services that keep mechanical systems performing at their best, minimising downtime and extending asset life.
Our Work

Selected Project Portfolio

Why Choose Us

Trusted By Clients Across Ireland

Experience
Established in 2002, with over 20 years of delivering mechanical engineering solutions across Ireland.
Delivery
Projects completed safely, on schedule and within budget — every time, without exception.
Expertise
Specialist mechanical engineering capability across HVAC, plumbing and decarbonisation.
Partnership
Long-term relationships built on trust, transparency and consistent quality of work.
Sustainability

Supporting Ireland's Decarbonisation Journey

We're proud to be part of Ireland's transition to net-zero buildings. From the Pathfinder Schools Programme to commercial retrofits, our team delivers the technical expertise and practical solutions that make buildings cleaner, warmer and cheaper to run.
  • Pathfinder Programme participant
  • Proven energy use reductions
  • Low-carbon heating solutions
  • Building performance improvements
Why Choose Us

Trusted By Clients Across Ireland

We are always interested in hearing from talented people who want to make a real difference in the built environment. We offer a supportive, professional environment where your skills can grow.
  • Engineers
  • Project Managers
  • Apprentices
  • Skilled Tradespeople
Accreditations:
CIBSE
Engineers Ireland
SEAI Registered
Safe-T-Cert
Pathfinder Partner
© 2026 Dominic O'Connor Ltd. All rights reserved.
Registered in Ireland · Company No. 359850