About this planner
EPC Cost Planner helps owners and landlords answer one question — what is it likely to cost to improve my EPC rating to C? — without pretending a website can replace an assessor. You enter a band (and a SAP score if you have one), remove measures already fitted, and we total indicative cost ranges, show the points gap to band C, and suggest a cheapest-first order.
Sources, checked 30 Oct 2026
Single compliance date of 1 October 2030 for the new standard, dual-metric standard, cost cap raised to £10,000 with a 10-year validity period for exemptions, and homes at EPC C recognised as compliant until their certificate expires. The response is a government decision; detailed legislation still has to follow through Parliament.
Typical installed costs used for the ranges on this site: loft insulation around £900 for a semi-detached house (around £600 to top up from 120mm), cavity wall insulation around £1,500 (terraced) to £2,700 (semi-detached), and an average domestic solar panel system around £7,000 for about 3.5kWp. Figures checked via Energy Saving Trust guidance and summaries of its advice pages on 30 Oct 2026.
Band A 92-100, B 81-91, C 69-80, D 55-68, E 39-54, F 21-38, G 1-20. Band C therefore starts at 69 SAP points.
Air source heat pump typical installation around £12,000 before grant support. The Boiler Upgrade Scheme grant is £7,500 for an air source heat pump in England and Wales — check current eligibility on GOV.UK.
What is indicative, and what is not
Policy facts (the 1 October 2030 date, the £10,000 cap, band C = SAP 69-80) come from the GOV.UK and EPC sources above. Cost ranges come from Energy Saving Trust typical costs and EPC indicative costs, and are labelled indicative everywhere — your quotes will differ. The SAP point gain shown for each measure is an illustrative planning estimate created for this planner, not an official SAP figure: only SAP / Home Energy Model software in an assessor's hands can score your home. Where we could not source a defensible range — solid wall and floor insulation — we show no price at all rather than invent one.
Policy honesty note: the January 2026 government response confirms the EPC C equivalent standard for rented homes, and it also makes clear the detailed legislation still has to follow. We say that on the homepage too, not just here.
Disclaimer
Planning estimates only. Not a quote, not financial or legal advice, and not a substitute for an EPC assessment by an accredited assessor. This site has no connection with GOV.UK, the Energy Saving Trust or any installer, and takes no commission from anyone.