When you replace one of your windows with double glazing, why doesn’t the house fall down? This is because there is a lintel above the window that holds up the bricks. This lintel has to go right the way through
Insulated Lintels
Get a SAP Calculation Before You Build Anything
A customer asked me if they should get the SAP calculation completed before they started building. The answer is yes. You should have a SAP calculation while you are still at the planning stage before you start building-I would advise
Why Does My Extension Need a SAP Test?
An extension needs a SAP test if the glazing is more than a quarter of the floor area. This includes doors, windows and rooflights. If any glazing is removed from the house in order to create the extension this is