Hi all! I've got a question regarding calculating the u-value for a new kitchen extension.
I am looking to build a single storey pitched roof extension onto a single storey house. It will have bi-fold doors and roof lights.
There will be 2 existing windows removed to create the openings to connect to the existing kitchen room, so it will effectively be one single room.
My question is... for the U-Value calculation, can I include the existing kitchen floor area in the total floor area calculation? Or do I only use the extension floor area?
You can only use the extension floor area unless you do a SAP which will consider the whole house. In simple terms the rule the glazing should not exceed 25% of the extension floor area but you can add any existing glazing covered/removed as part of the extension to the allowance. You could also investigate an area weighted U value calculation or failing that a SAP if these do not work.
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