About Dominic O'Connor Ltd

Welcome To

First established in 2002, we are proud to have earned a solid reputation for providing specialist commercial and industrial engineering services to the building industry. Over the years the company has worked on many prestigious projects involving complex steam, water, air and heating installations and has established an eminent maintenance division specialising in a full range of mechanical services.

Across all aspects of the industry, the company has experience in both design and installation and is able to undertake complete management of any project from initial planning and estimation through to project completion.

Accustomed to working with most major firms, Dominic O’Connor Ltd. has become a respected and experienced provider of building services throughout the country.

As well as working on new build projects, our highly skilled team of directly employed operatives provide a full array of mechanical services to existing live buildings, such as hospitals, pharmaceutical plants, hotels and commercial buildings.

In recent years we have established ourselves as a sectoral leader in Irelands drive to reduce CO2 emmissions with the establishment of our Decarbonisation team of specialists.

Dominic O’Connor Ltd is a specialist Mechanical Services Engineering contractor with a strong track record in delivering complex commercial, healthcare, industrial and education projects across Ireland.

With extensive experience in both design and installation, the company provides a complete service from initial planning through to project completion.

Our expertise spans high-spec mechanical systems including HVAC, pipework, heating, and specialist laboratory and process installations.

Known for our quality workmanship and dependable delivery, the company has built a reputation for successfully managing technically demanding projects, particularly within live environments such as hospitals, pharmaceutical facilities and large-scale educational developments.

By combining skilled in-house teams with modern construction methods such as BIM, offsite fabrication and Lean principles, Dominic O’Connor Ltd ensures precision, efficiency and consistently high standards across every project.

Alongside our core engineering capabilities, Dominic O’Connor Ltd plays a key role in building retrofitting and decarbonisation, supporting the transition to more sustainable and energy-efficient buildings.

We deliver tailored upgrade solutions across existing infrastructure, incorporating advanced technologies and modern mechanical systems to improve performance and reduce environmental impact.

Our work includes energy retrofits in sectors such as healthcare, education and commercial buildings, where careful planning and coordination are essential to minimise disruption.

By integrating innovative approaches with practical on-site experience, the company enhances building efficiency, extends asset life and contributes to national sustainability goals.

With a strong focus on quality, innovation and continuous improvement, Dominic O’Connor Ltd is helping to shape a more sustainable built environment across Ireland.

Company History