LANDLORD KNOWLEDGE
What does it cost to improve an EPC rating?
Published installation benchmarks are a starting point. The cost of reaching a rating depends on your property and the combination of works.
Installation benchmarks, not a quotation
Energy Saving Trust's retrofit guide gives these installation averages for a semi-detached home. They are not our prices, a promise of EPC points or a complete project budget.
| Measure | Published benchmark |
|---|---|
| Loft insulation, 0–270 mm | £750 |
| Cavity wall insulation | £2,200 |
| Solid wall insulation | £12,000–£15,000 |
| Solar panels | £7,600 |
| Heating controls | £600 |
| Air source heat pump | £12,000 |
| A-rated double glazing | £4,800 |
Source: Energy Saving Trust — Retrofit explained, checked 4 October 2026. The source excludes potential funding discounts. Its figures are examples, not minimum/maximum prices for your home.
What changes the price?
Floor area, access, scaffold, existing condition, moisture remediation, electrical work, finish quality and location can change the quotation. Clarify VAT treatment, permissions, assessment fees and making good. A loft top-up is a different job from removing contaminated insulation and starting again.
Do not add the table up and call it a plan
You may not need all these measures. Some are alternatives. The best-value combination must be suitable for the property and assessed against the target. A low installation cost is only useful if it addresses the actual weakness.
Keep the policy cap separate from your budget
A cap is a regulatory concept with evidence and exemption rules. It is not a grant, a standard quotation or a guarantee of what a property can achieve. Use the sourced policy guide to understand the current Government framework.