Conversions & Extensions to Existing Buildings

Conversions

Energy Calculations Limited can provide calculations required for conversions such as a single dwelling to multiple dwellings, commercial property to domestic property and conversion of an office to flats resulting in a material change of use showing compliance with Part L Building Regulations.

Maximum U-Values are required when renovating or retaining thermal elements as part of a material change of use or material alteration. Altering a house to flats or converting a barn requires this calculation. We will advise on the best method to show compliance with Part L.

The U-Value is an important aspect in building design. It represents the air-to-air transmittance of an element. This refers to how well an element resists heat loss. Limiting U-Values are required to show compliance with Part L Building Regulations. The lower the U-Value achieved the better.

Extensions

If a proposed extension has more than 25% glazing of the floor area and is not thermally separated from the main building, the extension will require a SAP report. Minimum U-Values are required for each new element.

The calculations are required to show compliance with Part L Building Regulations. The dwelling is required to show that the CO₂ emissions with the proposed extension, is no greater than the dwelling with a notional extension built to the standards required in Approved Document L.

Please do not hesitate to contact us should you require advice or assistance.