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SAP / RDSAP Assessment

A SAP (Standard Assessment Procedure) or RDSAP (Reduced Data SAP) assessment calculates the energy performance of a dwelling. SAP is used for new builds; RDSAP for existing dwellings. The results feed into the EPC and demonstrate Part L compliance.

Building Regulations Part L, SAP 10.2Valid: One-off (per build/assessment)

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What it covers

Fabric heat loss calculations
Heating system efficiency
Renewable energy contributions
Target Emission Rate (TER) vs Dwelling Emission Rate (DER)
Energy cost predictions

Who needs a SAP Assessment?

New build developers

Self-builders

EPC assessors

Building Control

Manage your SAP Assessment with CertBox

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Upload your SAP Assessment to CertBox against the right property.

Track expiry dates

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Frequently asked questions about SAP Assessment

What is the difference between SAP and RDSAP?

SAP uses detailed construction data (for new builds where you know exact specifications). RDSAP uses assumptions and visual inspection (for existing buildings where exact data isn't available). Both produce the same type of energy rating.

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