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Why do I need a SAP assessment for an extension?

20 Apr 2018 at 9:59 PM

One of the Building Regulations requirements for extensions is that the overall increase in openings (windows, doors, rooflights) is limited to 25% of the increase in floor area. This is because windows etc. usually have more heat loss than a wall, for example.

It is however possible to demonstrate that an excessive area of openings has been compensated for elsewhere in the design – and SAP Calculations are one way of achieving this.

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