Looking For a Quality and Affordable Services?


We are a family construction business based in Castlebar, Co. Mayo. Our reputation is based on over 4o years trade experience, exceptional service and outstanding results. The team at Seamus O’Brien Builders are qualified, expert tradesmen who have a wealth of experience in all aspects of the industry.

We specialise in all areas of building and construction whether it be in the private, commercial or public sectors and we are partnered with an expert panel of subcontractors and industry professionals.





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Our areas of specialty

  • Residential New Builds
  • Refurbishments
  • Housing developments
  • Educational buildings
  • Public Buildings
  • Sporting facilities
  • Commercial Buildings
  • Religious Buildings
  • Civil Engineering works