Energy Ratings

Energy Ratings

St Johns Window Centre manufacture the widest range of Energy Efficient Rated Products in Worcester.

St Johns Window Centre manufacture products that are certified within CERTASS Thermal Ratings Register ensuring you the customer get what you ordered and our manufacturing and processing systems are third party audited which we believe gives a better product than some simplified systems which allows substituting of products.


St Johns Window Centre are proud to show our CERTASS TRR labels for our Certified Rated Energy Efficient Windows.

PVCu Windows are constructed from 5 chamber Kommerling C70 Gold PVCu system with centre chamber fully reinforced with steel for maximum strength and double glazed with Pilkington EnergiKare glass units.

Windows can be made in White or Woodgrain PVCu and is the same product we have manufactured for many years with the addition of argon gas and low iron glass as standard, where they used to be an extra option.


St Johns Window Centre manufacture PVCu ‘A+’ Rated Windows.

With all the benefits of ‘B’ Rated products but with the addition of Planitherm or Pilkington KS glass which further increases the thermal performance.

During 2015 St Johns Window Centre registered a Triple Glazed Window with a A+11 rating this with our trusted 3 Chamber Outerframe which is our preferred frame with the extra weight of glass.

The First Triple glazed window to be registered with BFRC was manufactured in Worcester by St Johns Window Centre.