EPC Rating Improvement Calculator Trending
Estimate your EPC rating and see which upgrades will improve it most. Includes costs and annual savings.
Last updated: April 2026 · Source: GOV.UK — Energy Performance Certificates
Estimated EPC Rating
56
Potential Upgrades
Loft insulation (270mm)
+8 EPC points · Saves ~£355.00/yr
£400.00
Cavity wall insulation
+12 EPC points · Saves ~£310.00/yr
£700.00
Double glazing
+10 EPC points · Saves ~£120.00/yr
£5,000.00
Smart thermostat
+3 EPC points · Saves ~£75.00/yr
£200.00
LED lighting
+2 EPC points · Saves ~£40.00/yr
£100.00
Solar panels (4kWp)
+15 EPC points · Saves ~£500.00/yr
£6,000.00
Simplified estimate — actual EPC depends on property size, age, floor area and surveyor assessment. Minimum EPC for rental properties: Band E (Band C from 2028 for new tenancies).
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
An Energy Performance Certificate (EPC) rates a property's energy efficiency from A (most efficient) to G (least efficient) on a scale of 1-100. The rating is based on the building's construction, insulation, heating system, lighting and renewable energy features. EPCs are required when selling or renting a property in England and Wales.
The assessment considers the property's fabric (walls, roof, floor, windows), heating system type and efficiency, hot water system, lighting (proportion of low-energy bulbs) and any renewable energy generation. Each factor contributes to the overall score. A typical UK home scores Band D (55-68 on the scale).
This calculator provides an estimated EPC rating based on your property's characteristics. It identifies the improvements most likely to increase your rating and estimates the cost and energy saving of each. Landlords must have a minimum EPC rating of E to let a property, with plans to raise this to C for new tenancies.
Example: 1970s 3-bed semi, gas central heating
- Cavity wall insulation: +5 points
- Loft insulation (270mm): +4 points
- Condensing boiler: +8 points (already fitted)
- Double glazing throughout: +3 points (already fitted)
- LED lighting (100%): +2 points
- Estimated rating: Band D (62/100)
Frequently Asked Questions
- What does the EPC Rating Improvement Calculator do?
- Estimate your EPC rating and see which upgrades will improve it most. Includes costs and annual savings. 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.