Hi Seonaid. The rear of the house qualifies as open plan so the floor area is greater than the photo would make it appear. Therefore we were below the 25% threshold and no SAP was required. If you are planning a project with glazing more than the 25% it is possible to work through the specification to improve the performance elsewhere in the property as a 'trade-off'. You should then be able to show the 'trade-off' as part of your SAP calculation. I hope that helps.
I live in East London and has applied for planning permission to add a garden room to the rear of my existing extension. The plan was to project the garden room about 3 m and the Newham Authority has said they will only allow 1.5m. Any suggestions? Should I go for a pergola instead of the glass garden room?
IMBY3 Architecture & Design
Seonaid ReidOriginal Author
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