Make sure your conversion/extension complies with Part L1B of the English and Welsh building regulations.
DSJ Planning and Design can guide you through the process.
You may not be aware that all conversions and extensions require some SAP input to prove that they meet the current regulations in relation to the envelope U-values and sometimes the area of glazing/openings. Very often it has to be proved that the CO2 emissions from an extended dwelling with a large glazing area are no worse than those of a dwelling plus an extension that complies with the 25% glazing allowance as stated in the Building Regulations, especially with Part L1B, the SAP calculation should be carried out before work commences and in most cases Building Control will insist on receiving a calculation before they will pass a building Regulation application. To start the work under a Building Notice can be very risky and expensive if the conversion fails compliance at the “As Built” stage.
With conversions Building Control will require an “As-Built” SAP calculation and EPC before they can provide their completion certificate.
If you are planning a New Build please visit dsjplanninganddesign.co.uk for information on our services.