House Extension Calculations

THE BRIEF

We were instructed to complete House Extension Calculations on this proposed extension in Charlbury
These consisted of L1B Design and As-Built SAP Calculations

House Extension Calculations

THE PROCESS

To achieve compliance, the proposed extension must improve the performance of the dwelling
Our assessors specified a low U-Value Design and the installation of an efficient heating system

THE RESULTs

SAP RESULTS

≤ 29.41

Notional Dwelling Emission Rate (DER)

≤ 116.04

Notional Dwelling Fabric Energy Efficiency (DFEE)

28.89

Proposed Dwelling Emission Rate (DER)

116.03

Proposed Dwelling Fabric Energy Efficiency (DFEE)

PASS

PASS

Compliant

The proposed dwelling is more efficient than the notional dwelling therefore compliant with the Part L Building Regulations

Please refer to our Myth Busters for SAP Calculations here for common misconceptions

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