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We're getting an extension built over the garage to extend the living space and we're trying to optimise for natural lighting. The design introduces more than the 25% of the extended floor space in new glass so we're told by the building regs people that we need to get SAP calculations done. Can anyone advise as to what the scope of those SAP calcs should cover and do I also need a new EPC certificate or does that come with it? I don't quite understanding if the evaluation needs to be done for the entire house or limited to just the space in which we're making changes to. I want to make sure I'm asking for quotes for what I actually need.

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