EPC Improvement Checker
See which home improvements will boost your EPC rating. Compare the cost versus increase in property value.
Current EPC Rating
39
out of 100
Potential New Rating
100
+90 points
Total Investment
£29,600
Annual saving: £1,850
Payback: 16.0 years
Recommended Improvements (by Cost-Effectiveness)
Loft Insulation to 270mm
+15 EPC pointsUpgrade loft insulation from 0mm to 270mm
Cost
£500
Annual Saving
£150
Payback
3.3 yrs
ROI
30%
Upgrade to Smart Heating Controls
+5 EPC pointsInstall smart thermostat and TRVs for precise heating control
Cost
£400
Annual Saving
£80
Payback
5.0 yrs
ROI
20%
Cavity Wall Insulation
+12 EPC pointsFill cavity walls with insulation (one-time, permanent)
Cost
£1,200
Annual Saving
£120
Payback
10.0 yrs
ROI
10%
Replace Old Boiler with High-Efficiency
+8 EPC pointsInstall new condensing boiler (90%+ efficiency)
Cost
£2,500
Annual Saving
£200
Payback
12.5 yrs
ROI
8%
Install 5kW Solar Panel System
+15 EPC pointsInstall solar PV system with battery storage potential
Cost
£10,000
Annual Saving
£600
Payback
16.7 yrs
ROI
6%
Install Air Source Heat Pump
+25 EPC pointsReplace boiler with heat pump (requires grants consideration)
Cost
£10,000
Annual Saving
£500
Payback
20.0 yrs
ROI
5%
Modern Double/Triple Glazing
+10 EPC pointsReplace single glazing with high-performance windows
Cost
£5,000
Annual Saving
£200
Payback
25.0 yrs
ROI
4%
Quick Wins (under £500)
- ✓Upgrade to Smart Heating Controls (5.0 yr payback)
Medium (£500-5000)
- ▪Loft Insulation to 270mm (3.3 yr payback)
- ▪Cavity Wall Insulation (10.0 yr payback)
- ▪Replace Old Boiler with High-Efficiency (12.5 yr payback)
Major (£5000+)
- ●Install 5kW Solar Panel System (16.7 yr payback)
- ●Install Air Source Heat Pump (20.0 yr payback)
- ●Modern Double/Triple Glazing (25.0 yr payback)
💰 Grants & Support Available
BUS Grant (Boiler Upgrade Scheme)
£7,500 towards heat pump installation. Check eligibility on gov.uk
Local Authority Grants
Many councils offer insulation and heating grants. Contact your local authority
Energy Company Obligation (ECO)
Some energy suppliers offer free/discounted insulation. Ask your provider
Tax Relief
Energy-efficient improvements may qualify for 5% VAT rate instead of 20%
💡 Improvement Strategy
- Start with loft insulation: Fastest payback, biggest impact
- Add cavity wall insulation: Permanent benefit, no disruption
- Upgrade windows: Improves comfort and appearance too
- Replace old boiler: Consider heat pump for green credentials
- Invest in controls: Smart controls save money with less investment
- Add solar later: Combine with other upgrades for best savings
What Lifts Your EPC Rating Fastest
EPCs in England and Wales score from A (92+) to G (1-20), with most existing UK homes sitting at D or E. The cheapest, fastest gains come from the basic envelope: loft insulation to 270 mm depth, cavity wall insulation if uninsulated, and modern double glazing. Loft insulation alone takes a typical D-rated house up by 10 to 15 EPC points and costs around £500. Cavity walls add another 10 to 15 points for £400 to £700.
The big-ticket items (heat pumps, solar, full external wall insulation) move ratings further but at much higher cost. The checker ranks improvements by cost-effectiveness, not just by absolute EPC gain, so you see what the next cheapest move is rather than the most dramatic. For most semi-detached homes built between 1975 and 1995 (the defaults here), four or five basic measures lift a low D into a high C, which is the threshold many landlord regulations target.
Why C Matters for Landlords
Properties rented in England and Wales must have an EPC of E or higher under MEES (Minimum Energy Efficiency Standards). Government proposals have repeatedly floated raising the bar to C for new tenancies, and although the timeline keeps slipping, the direction is clear. Landlords who plan to keep a portfolio for 5+ years are wise to lift each property to C now rather than scrambling later when installer demand spikes prices.
Owner-occupiers face fewer hard rules but still benefit. Mortgage lenders increasingly offer green mortgages with discounted rates for higher-rated properties. Buyers also notice; surveys show that EPC-A and B properties sell for 2 to 5 percent more than equivalent D or E homes. For the running cost side once improvements are in, [Home Energy Cost Calculator](/home-energy-cost-calculator) shows the new monthly bill.
Frequently Asked Questions
How can I improve my EPC rating?
In rough order of cost-effectiveness: loft insulation to 270 mm, cavity wall insulation, low-energy lighting throughout, modern thermostat or smart heating controls, double or triple glazing, modern condensing boiler or heat pump, then solar panels. The first four often cost less than £2,000 combined and lift a typical D-rated house by 15 to 25 EPC points.
How much does it cost to go from D to C?
Typically £1,500 to £4,000 in measures, depending on the property's starting point. A pre-1975 cavity wall house with no insulation can hit C for under £1,500 with loft and cavity wall work. A 1930s solid-wall semi with single glazing might need £8,000 to £15,000 in fabric upgrades to clear C.
Do I need to upgrade my EPC if I am a landlord?
Yes for England and Wales. The current minimum for both new and renewing tenancies is E. The Government has proposed raising this to C for new tenancies (potentially 2028 onwards) and for all tenancies later. Properties below the minimum can be let only with a registered exemption.
How long does a new EPC take to organise?
About 2 to 5 working days from booking. The assessor visits for around 30 to 60 minutes, takes measurements and photos, then files the report on the central register within 28 days. Cost in 2026 is typically £60 to £120 plus VAT.
Related Tools
Insulation Savings Calculator
Calculate how much you'll save by adding loft insulation, wall insulation, or pipe insulation to your home.
Home Energy Cost Calculator
Calculate your estimated annual energy costs based on property size, appliances, and fuel prices.
Double Glazing Payback Calculator
Find out if upgrading to triple glazing or replacing single glazing with double glazing will pay for itself.