Request for compliance check for extension. Dwelling details.
You can make a request for an Extension compliance calculation by describing
the dwelling extension on this form and clicking the submit button. The cost
of the calculation is from £100.00 per dwelling extension. You will be invoiced for this amount and the
calculation will be sent on receipt of payment.
This calculation deals just with the extension and will check that the total rate of heat loss is not more than it would be if all elements of the extension had the values given in Table 1.
It will also check the area of openings taking into account any pre-existing openings which will no longer be exposed.
For an overglazed extension where a comparative carbon emissions calculation is required, full SAP information for the existing house will be requires (see link to SAP survey form). Cost for this is to be agreed.
The calculation can be done using Sapper 8.0x (SAP2005) or Sapper 9.0x (SAP2009).
You can go off-line to complete the details.
It may be necessary for more detailed information to be requested.