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This technical support section gives BER assessors support and guidance across a range of BER related topics.

Building fabric

Building fabric inputs in DEAP take account of elements including fabric insulation and thermal bridging.

Technical Support for building fabric

Space heating

Key considerations for space heating in a dwelling when calculating energy use in DEAP.

Technical support for space heating

Heat pumps

Support and guidance to help when calculating the efficiency of a domestic heat pump system for DEAP.

Technical support for heat pumps

Hot water

Technical support to help you best represent domestic hot water systems in a BER assessment.

Technical support for hot water


Support to help you publish a BER to NAS, including a guide to the different types of status codes.

Technical support for publishing

Documentary evidence

Best practice for quality and compliance with data protection when collecting documentary evidence for a BER.

Best practice for documentary evidence

Advisory report

The BER Advisory Report provides guidance about upgrades that could improve the BER rating of the property.

About the report

Building Regulations

Information about Part L Building Regulation compliance for dwellings in DEAP assessments.

Technical support for building regulation