In simple terms, the earlier you appoint a SAP assessor – the greater your chance of success!
From the plans and drawings provided by the designer during the design stage the assessor inputs the data into approved software – which determines whether the proposed dwelling will comply with the requirements of the building regulations with regards to the conservation of fuel and power. The assessor is able to use the software to model different variations of the design if the initial specification doesn’t show compliance.
The assessor should then advise the designer of the shortfalls and recommend solutions as required. These modifications can then be taken into account, the design revised and appropriate SAP calculations produced for submission to building control.