What information is needed for a SAP calculation?
A practical drawing and specification checklist for design-stage and as-built assessments.
Read articleKnowledge & guidance
Direct answers for
better design decisions.
Concise guidance for architects, builders, developers and homeowners working through domestic energy and Building Regulations requirements.
When does an extension need an area-weighted U-value calculation?
When the method may help, what it compares and why it is not a universal glazing workaround.
Read articleSAP calculation vs EPC: what is the difference?
How the design assessment, as-built calculation and new-dwelling certificate relate.
Read articleWhat is a Part O overheating assessment?
The purpose of Part O and the design decisions that commonly affect overheating risk.
Read articleWhen should Part O be considered during design?
Why overheating should be tested before elevations and opening strategies are fixed.
Read articleWhat information is needed for a Part G water calculation?
The fitting data that turns a provisional sanitaryware schedule into a defensible calculation.
Read articleUnderstanding U-values in Building Regulations projects
What a U-value represents—and why the real construction build-up matters.
Read articleWhy thermal bridging matters in SAP calculations
How junction assumptions affect heat loss and why details should be coordinated early.
Read articleA Building Regulations energy-compliance checklist for designers
Nine coordination checks before a domestic project is sent for assessment.
Read articlePrimary sources
Official guidance
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