EPC Band Comparison Calculator
Compare energy costs between EPC bands. See annual savings from upgrading your rating.
Last updated: April 2026 · Source: GOV.UK — Find an energy certificate
Moving from Band D to Band C
Save £500.00/year
10-year saving: £5,000.00
Disclaimer
This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.
How It Works
Comparing EPC ratings between properties helps you understand the relative energy costs and efficiency of different homes. A property rated Band C typically has annual energy costs £300-£600 less than a Band D property, and £600-£1,200 less than a Band E property. The exact savings depend on property size, heating system and local energy prices.
When buying a property, the EPC shows both the current rating and the potential rating if recommended improvements are made. The gap between current and potential ratings indicates how much room there is for improvement. Properties with a large gap often offer the best value because energy costs can be reduced significantly through upgrades.
This calculator compares the EPC ratings and estimated energy costs of up to three properties side by side. It shows the annual cost difference, the likely cost of upgrades to reach the potential rating, and the estimated payback period for each improvement.
Example: Comparing two properties
- Property A: Band C (72), estimated energy cost £950/year
- Property B: Band E (45), estimated energy cost £1,650/year
- Annual difference: £700
- Property B upgrade to Band C: ~£5,000 (insulation + boiler)
- Payback period for upgrades: ~7 years
- Over 10 years: Property B costs £2,000 more even after upgrades
Frequently Asked Questions
- What does the EPC Band Comparison Calculator do?
- Compare energy costs between EPC bands. See annual savings from upgrading your rating. All calculations are performed in your browser using official UK rates and thresholds.
- Does this reflect the current energy price cap?
- This calculator uses representative energy prices. The Ofgem energy price cap changes quarterly — check Ofgem's website for the latest cap level applicable to your region and payment method.
- Can I save money by switching tariff?
- Potentially yes. The energy market offers various fixed and variable tariffs. Use a comparison site authorised by Ofgem (such as Ofgem's own comparison tool) to check if switching could save you money.