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EPC Retrofit Cost Calculator
Estimate the cost of improving your property's EPC rating. Select the measures you are considering, adjust costs to match your quotes, and see the total investment and payback period.
EPC C Deadline for Rental Properties
The UK Government has confirmed that all privately rented properties in England and Wales must reach EPC band C by 2030. Non-compliance could result in fines of up to £30,000 per property. Check GOV.UK for the latest exemption guidance.
Select Retrofit Measures
Toggle measures on/off and adjust costs to match your contractor quotes. Default costs are illustrative averages.
Loft Insulation (270mm)
High impactTop up or install loft insulation to recommended 270mm depth. One of the most cost-effective improvements.
Cavity Wall Insulation
High impactFill cavity walls with insulation material. Suitable for properties built after 1920s with unfilled cavities.
Internal / Solid Wall Insulation
Very High impactInsulate solid walls internally or externally. Significant improvement but higher cost. Essential for pre-1920s properties.
Double / Triple Glazing
Medium impactReplace single-glazed windows with double or triple glazing. Reduces heat loss and improves comfort.
Draught-Proofing
Low-Medium impactSeal gaps around windows, doors, letterboxes, and floorboards. Low cost, quick improvement.
New Condensing Boiler
High impactReplace an old G-rated boiler with a modern A-rated condensing boiler. Typical lifespan 10-15 years.
Smart Heating Controls
Low-Medium impactInstall smart thermostats, TRVs, and programmable heating controls. Reduces energy waste.
Air Source Heat Pump
Very High impactReplace gas boiler with an air source heat pump. Significant carbon reduction. May require improved insulation first.
Solar PV Panels
High impactInstall rooftop solar panels to generate electricity. Reduces bills and improves EPC. Feed-in potential.
Hot Water Cylinder Insulation
Low impactInsulate the hot water tank with a British Standard jacket. Very low cost, quick win.
LED Lighting Throughout
Low impactReplace all bulbs with LED alternatives. Low cost and improves the lighting energy score on EPC.
Floor Insulation
Medium impactInsulate suspended timber floors or solid floors. Often overlooked but can make a noticeable difference.
e.g. ECO4, Great British Insulation Scheme, Boiler Upgrade Scheme, local authority grants
How much you expect to save per year on energy bills after improvements
Total Retrofit Cost
£0
Measures Selected
0 of 12
Your Cost (After Grants)
£0
Annual Energy Savings
£400/year
Simple Payback Period
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EPC Rating Scale
Available Grants & Funding
Boiler Upgrade Scheme (BUS)
Up to £7,500 towards an air source heat pump or £5,000 towards a ground source heat pump. Available to homeowners and landlords in England and Wales.
Check eligibility on GOV.UK →Great British Insulation Scheme
Free or subsidised insulation for eligible households. Covers loft insulation, cavity wall insulation, and other measures.
Check eligibility on GOV.UK →ECO4 Scheme
Energy Company Obligation funding for insulation, heating, and other energy efficiency measures. Targeted at low-income and vulnerable households.
Learn more on Ofgem →Local Authority Grants
Many local councils offer additional grants and loans for energy efficiency improvements. Check with your local authority for schemes in your area.
Find local schemes →Check Your Current EPC Rating
Look up the current EPC rating and recommendations for any property in England and Wales — free on the government register.
Check EPC on GOV.UK →Save this analysis
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Frequently Asked Questions
What EPC rating do rental properties need by 2030?
The UK Government has confirmed that all privately rented properties in England and Wales must achieve a minimum EPC rating of C by 2030. The deadline is fixed — landlords should plan improvements now as costs and contractor availability will worsen as 2030 approaches.
What is the cheapest way to improve an EPC rating?
The most cost-effective measures are typically loft insulation (£300-£600), draught-proofing (£150-£300), LED lighting (£50-£150), and hot water cylinder insulation (£20-£30). These low-cost measures can often shift a property by one EPC band without major disruption.
Can I get grants to help pay for EPC improvements?
Yes. The Boiler Upgrade Scheme offers up to £7,500 towards an air source heat pump. The Great British Insulation Scheme provides free or subsidised insulation for eligible homes. ECO4 targets lower-income households. Always check eligibility before paying full price — significant funding goes unclaimed annually.
How much does it cost to go from EPC E to EPC C?
Typical costs range from £5,000-£15,000 depending on the property type and starting condition. A semi-detached house in poor condition may require cavity wall insulation, loft insulation, and a new boiler or heat pump. A property that already has good insulation may only need a boiler upgrade or solar panels.
What happens if my rental property doesn't meet the EPC requirement?
Under the confirmed rules, landlords could face fines of up to £30,000 per property for non-compliance. An exemption register exists for properties where the maximum spend (expected around £15,000) has been reached but EPC C is still not achievable, or where improvements would damage the building's structure — confirm the exact spend cap figure on GOV.UK.
Disclaimer: This calculator provides estimates for illustrative purposes only. Results are based on simplified assumptions and should not be relied upon for financial decisions. Actual costs, returns, and outcomes will vary. Always consult a qualified professional before making property or financial decisions.
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EPC C Deadline for Landlords — What's Required and When
The government confirmed that all privately rented properties must achieve a minimum EPC rating of C by 2030. The deadline applies to all rental properties — there is no phased timeline for new versus existing tenancies. The 2030 deadline is firm. Retrofitting a whole portfolio close to the deadline is expensive and qualified contractors will be scarce — start planning now.
Currently, all rental properties must have a minimum EPC rating of E. Properties rated F or G cannot legally be let (unless an exemption applies) — landlords face fines of up to £30,000 per property.
What Improvements Move the EPC Rating Most?
Common improvements and typical point impact: loft insulation (£300-£600, +8-12 SAP points), cavity wall insulation (£500-£1,500, +6-10 points), heat pump replacing gas boiler (£7,000-£14,000 after grant, +5-15 points), double glazing replacing single (£3,000-£8,000, +4-8 points), solar panels (+10-20 points). The most cost-effective path depends on your starting EPC and property type.
Grants Available — Don't Pay Full Price
The Boiler Upgrade Scheme offers £7,500 towards an air source heat pump. The Great British Insulation Scheme and ECO4 provide free or subsidised insulation for lower-rated properties. Always check grant availability before paying full price — thousands of pounds in support goes unclaimed by landlords every year.
Exemptions and Cost Cap
Under the confirmed rules, the maximum spend required to reach EPC C is expected to be around £15,000 (confirm on GOV.UK for the final figure). Spend up to this and still can't reach C? Register for an exemption. Exemptions also apply where improvements would damage the property's structure — common with listed buildings and older stone properties.