EPC Rating Improvement Calculator
See which energy upgrades will improve your EPC rating the most, and how much they'll cost.
Enter your current EPC rating and tick what you already have installed. The calculator ranks the remaining upgrades by EPC impact and shows cost, annual savings, and grant eligibility for each.
What do you already have installed?
Current rating
D (55–68 SAP)
Projected rating
A (92–100 SAP)
Total annual saving
£2,110
Total investment
£27,350
Upgrades recommended
7
Upgrades ranked by EPC impact
Install cost
£9,000 – £12,000
Annual saving
£300 – £650
Payback
~22.1 yrs
£7,500 BUS grant available (England/Wales)
Install cost
£600 – £1,000
Annual saving
£250 – £400
Payback
~2.5 yrs
ECO4 / GBIS may fund this fully
Install cost
£400 – £700
Annual saving
£200 – £300
Payback
~2.2 yrs
ECO4 / GBIS may fund this fully
Install cost
£4,500 – £8,000
Annual saving
£400 – £650
Payback
~11.9 yrs
Install cost
£4,000 – £9,000
Annual saving
£140 – £220
Payback
~36.1 yrs
Install cost
£2,000 – £3,000
Annual saving
£150 – £300
Payback
~11.1 yrs
Install cost
£150 – £350
Annual saving
£80 – £180
Payback
~1.9 yrs
* SAP point improvements are typical estimates based on the Standard Assessment Procedure. Actual improvements depend on your specific home and current specification. Get a formal EPC assessment to confirm your rating.