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SAP 10.2 Calculator
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SAP 10.2 Calculator
Dwelling energy & CO₂ assessment — SAP 10.2 / Building Regs Part L 2021 (England)
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Import from Revit / BIM
Auto-fill areas & U-values from a gbXML model
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Active Regulation
SAP 10.2 — Standard Assessment Procedure
AD Part L Vol.1 (2021), England · effective 15 Jun 2022 · Verified 2026-06-15
CURRENT
🏠 Dwelling
Total floor area
(m²)
All storeys, internal
Storeys
Dwelling form
Detached house
Semi-detached / end-terrace
Mid-terrace
Apartment / flat
Glazing ratio
(× floor area)
≈0.18 typical
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Element areas (advanced — else derived from geometry)
🧱 Fabric U-values
W/m²K (whole element) · backstop in brackets
External wall
(≤0.26)
Roof
(≤0.16)
Ground floor
(≤0.18)
Windows / glazing
(≤1.60)
External doors
(≤1.60)
Air permeability
(≤8.0)
m³/(h·m²) @50Pa
⚙️ Services
Main heating
Mains gas boiler
Air-source heat pump
Direct electric
Heating oil
LPG
Wood pellet / biomass
Ventilation
Natural (trickle + intermittent extract)
Intermittent extract fans
Continuous mechanical extract (cMEV)
MVHR (heat recovery)
Solar PV
(kWp)
0 if none
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📋 SAP 10.2 fuel factors (Table 12)
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