About Costello Windows

Costello Windows produces unique and beautiful A-rated products for the residential and commercial markets. We will transform your home with products that look stunning and perform to the highest standards. All our products are tested in the UK using British Standard Testing. Our window systems are designed to be aesthetically pleasing and to give a massive wow factor.


Costello Windows manufactures every facet of the final product in-house from a 13-acre factory located in Glin, County Limerick. We have been in business since 1979. Costello Windows employs a set of 50 skilled employees. We have a specific belief that quality, innovation and service are vital to success, every day we look to improve.

Costello Windows and Doors Manufacturing
Innovative Products at Costello Windows and Doors

Innovative Products

Costello Windows’ latest patented design is the Townhouse Sash Window. This window is designed in the style of a sliding sash window but opens in a different way. The Townhouse Sash Window does not slide up and down but rather the top sash opens out and the bottom sash opens in. This gives full fire escape access and ensures that the window has a compression seal.