Home Improvement Protection
  • Wooden Windows
  • Conservatories
  • Listed Building Windows
  • 10 year guarantee

Firth (UK) Ltd is a family business specialising in the manufacture, supply and installation of windows, doors, conservatories and bespoke joinery with heritage dating back to 1935.

All of our products are manufactured to the highest standards in Sheffield by our long-standing team of craftsmen, using the finest quality timbers from sustainable sources.

We also provide a Windows for Listed Buildings service and a Replacement Windows service for buildings in a Conservation AreaSimilarly we have been involved with barn conversions and other architectural projects including school and church refurbishments.

Make your home as individual as you are. 

We are verified by Certass to ensure that we meet current UK Building Regulations and we confidently back our timber products with a 10 year manufacturing guarantee.



Wooden Windows & Doors
hardwood or softwood in a variety of styles, glazing options and finishes to suit your property

Listed Buildings & Conservation Areas
approved designs including our own slim 12mm double glazing

Our 10 Year Guarantee
On all our manufactured products, backed by Certass