Green Building Store is now 21°

Self-build House, Monmouthshire

PERFORMANCE double glazed timber windows and doors from 21° were recently chosen for a new-build detached 4 bedroom project in Monmouthshire.

The clients had previously lived in a cold and draughty house but wanted to move to a warmer house with low running costs and lower environmental impact. In addition to using PERFORMANCE double glazed timber windows and doors, the project also featured SIPS (structural insulated panel system) with added internal insulation. Triple glazing was used in the home’s music room for its acoustic benefits. Renewable technologies such as solar thermal and PV were also used in the project.

21°s PERFORMANCE timber windows and doors were chosen after a lot of research and looking around at a range of companies.

We liked what PERFORMANCE had to offer – the combination of appearance, price, environmental performance and service “ “We have been really pleased with the windows & doors they are really lovely. We get a lot of comments and interest in them from visitors coming to the house. The house has been incredibly warm and cheap to run – with our heating and hot water costs coming in at £250 a year.


21° also installed the windows and doors and the clients were pleased with the quality of the fitting work provided and aftercare in dealing with any teething problems.

We are really happy with the windows & doors and are continually recommending them to people.


Project details



Life changing homes