England & Wales · EPC improvement calculator
What band can a home like yours reach?
Other tools score improvements with a hidden formula. We answer from the real register: pick a home's type, age and current band, and see how many homes like it actually reach band C (the warmer, cheaper-to-run standard) — and what each measure was observed to do to the score.
Homes like yours that reach band C
100%
once the assessor-recommended improvements are done — based on EPC potential ratings in the register
Typical band improvement
+1.6 bands
Typical cost to reach band C
£19,200
Typical annual saving
£280/yr
What each measure does — observed, not assumed
The measures most often recommended for this cohort. Where we have it, each carries the observed median EPC (SAP) change from homes in the register reassessed before and after that single measure — the real before/after, not a points formula.
- Solar PVrecommended for 99% of these homes+12 SAP observed
- Floor insulationrecommended for 90% of these homes+1 SAP observed
- Solar water heatingrecommended for 83% of these homes−1 SAP observed
- Wall insulationrecommended for 67% of these homes+6 SAP observed
- Low-energy lightingrecommended for 49% of these homes+1 SAP observed
- Heating controlsrecommended for 26% of these homes+3 SAP observed
- Condensing boilerrecommended for 20% of these homes+4 SAP observed
- Loft / roof insulationrecommended for 18% of these homes+4 SAP observed
Based on 938,865 houses built 1930–1949 currently rated band D, from the full EPC register.
Want the number for your actual home?
These are cohort medians. Check your real EPC instead.
Enter your address and we start from the home's real certificate in the register — its own rating, the recommended improvements, and what it'd cost to make it warmer and cheaper to run — not a typical home like it.
More calculators
- Cost to reach band CThe median cost to get there, broken down by measure.
- Energy savings & paybackAnnual saving at today's prices, payback, and 10-year net.
- Heat pump calculatorSuitability, the £7,500 grant, and the running-cost case.
- Retrofit grant checkerWhich grants you may qualify for, by tenure, band and income.
- MEES exemption checkerFor landlords: whether a below-C rental qualifies for an exemption, and how to register it.
Cohort medians from the full EPC Open Data register; observed SAP changes from homes reassessed before and after a single measure. Figures are a guide for a home like yours, not a quote for a specific one. Methodology.