O.N.S. Ireland is a company based in Ireland. ONS are the biggest and best builder in county Laois. To date, the company has completed Fairgreen Village, Portlaoise (500 houses), with a pub, crèche, shops, restaurants and offices, as well as the Esker Hills (500 houses) development. Our expert division that specializes in large scale construction of residential and commercial developments – with an award winning record and over 2,500 housing units successfully completed we are the leading site development company in Ireland.