SAP calculations typically cost between £140 and £300, depending on the size, complexity and specification of the project. Multi-unit developments often benefit from lower per-dwelling rates. Upload your drawings to receive a quotation within 15 minutes during business hours.

Floor plans, elevations, sections, a site plan and a full building specification are required. This includes the proposed construction build-ups, glazing, heating system, and any renewable technologies.

Common reasons for failing a SAP calculation include poor insulation levels, excessive glazing, thermal bridging, inefficient heating systems, high air permeability and insufficient low-carbon technology provision.

Most SAP calculations are completed within 5 working days of receiving the required drawings and specification information.

For new build dwellings, the SAP assessment is used to generate the Energy Performance Certificate (EPC). The EPC is issued following completion of the dwelling as part of the as-built SAP assessment process.

Yes. SAP calculations for extensions are assessed under different Building Regulations requirements to new build dwellings. The assessment is typically used to demonstrate compliance with Part L extension standards rather than generate a new dwelling EPC.

All SAP calculations are completed by accredited SAP assessors using approved software and are suitable for Building Control submission. Over 95% of projects achieve compliance at the first assessment stage, with practical recommendations provided where improvements are required.

Yes. SAP calculations can be updated to reflect changes to the dwelling design, construction specification, glazing, heating system or renewable technologies.

SAP calculations should be completed before construction begins to demonstrate compliance with Part L Building Regulations and identify any changes required before work starts on site.

Yes. SAP calculations are typically required when converting a building into one or more dwellings, including barn conversions, office-to-residential conversions and flat conversions.