EPC Rating Calculator UK | Estimate Your Energy Performance Certificate

UK 2026 · SAP Methodology

EPC Rating Calculator

Estimate your property's Energy Performance Certificate band instantly. Get personalised improvement recommendations with projected costs and savings.

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Property

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Insulation

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Windows

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Heating

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Renewables

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Property Details

Basic information about your home

Property Type Detached House Semi-Detached House Terraced House Bungalow Flat (Mid Floor) Flat (Top Floor) Flat (Ground Floor)

Year Built Before 1930 1930 – 1949 1950 – 1966 1967 – 1975 1976 – 1982 1983 – 1990 1991 – 1995 1996 – 2002 2003 – 2006 2007 – 2011 2012 – 2022 2023 or later

Total Floor Area

m²

Number of Bedrooms optional 1 Bedroom 2 Bedrooms 3 Bedrooms 4 Bedrooms 5+ Bedrooms

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Insulation

Loft, wall, floor and draught proofing

Loft / Roof Insulation None Partial (<100mm) Standard (100–200mm) Good (200–270mm) Excellent (270mm+)

Wall Insulation Solid Wall — None Solid Wall — Internal Solid Wall — External Cavity Wall — Unfilled Cavity Wall — Filled Modern / Well-Insulated

Floor Insulation None Partial Full

Draught Proofing None Partial Full

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Windows & Doors

Glazing type and external door quality

Glazing Type Single Glazed Double Glazed (pre-2002) Double Glazed (post-2002) Triple Glazed

External Doors Solid Wood (old) uPVC Composite

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Heating & Hot Water

Heating system, controls and fuel type

Main Heating System Gas Boiler (non-condensing, old) Gas Boiler (condensing, modern) Air Source Heat Pump Ground Source Heat Pump Electric Storage Heaters Electric Direct Heaters Oil Boiler (old) Oil Boiler (condensing) Biomass / Wood Burner District / Communal Heating

Heating Controls None / Manual Basic Thermostat Room Thermostat + Timer Smart Controls (Nest/Hive etc.) TRVs + Smart Controls

Hot Water System Combi Boiler (no cylinder) Hot Water Cylinder (uninsulated) Hot Water Cylinder (insulated) Immersion Heater Solar Thermal Heat Pump Hot Water

Fuel Type Mains Gas Electricity Oil LPG Biomass / Wood

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Renewables & Lighting

Green technology and efficiency upgrades

☀️ Solar PV Panels 🌡️ Solar Thermal 💡 LED Lighting (75%+) 🔋 Battery Storage 🌬️ Wind Turbine 📊 Smart Meter

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Band —

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Est. Annual Energy Bill

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CO₂ Emissions (kg/yr)

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Potential Rating

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Recommended Improvements

Improvement SAP Points Est. Cost Annual Saving

🎯 Path to Target Band

Target: Band C (69–80) Band B (81–91) Band A (92–100)

ℹ️ This calculator provides an estimate only, based on simplified SAP (Standard Assessment Procedure) methodology. An official EPC must be carried out by an accredited Domestic Energy Assessor. Results are for guidance only and not a substitute for a formal assessment. EPC certificates are valid for 10 years in the UK.

Free UK EPC Rating Estimator · Updated for 2026 · SAP Methodology

For an official certificate, contact an accredited domestic energy assessor.