EPC Rating C: How to Get There and What It Costs

An EPC score is the government's SAP calculation of what a home costs to heat, light and supply with hot water per square metre, under standard assumptions, not your actual bills. Band C starts at 69, not at the middle of the band, so a home on 69 is band C. The English Housing Survey puts the average home in England at 68 points in 2024, and 56% of homes at band C or better, up from 26% in 2014. How the score is built up is explained in how EPC points are calculated.

Band C homes also tend to cost less to run. The median band C home's metered gas and electricity cost £1,591 a year, against £1,834 in band D, at the Ofgem cap for October to December 2026 (energy bills by EPC rating). These are different groups of homes, of different sizes, so the gap is not what one home would save by moving up a band.

Age matters because of the walls. 85% of homes built before 1919 have solid walls, which lose far more heat than filled cavity walls and are expensive to insulate. Homes built from the 1930s onwards mostly have cavity walls, and filling an empty cavity is one of the cheapest big gains, about 8 points for about £2,200. That is why the 1930s semi with cavity walls costs less than half as much as the same house with solid walls.

The 1950s and 1970s semis need only heating controls to reach 69 in our model, which is the very bottom of band C. A home that just scrapes in can slip back on a new certificate if the assessor records something differently, so filling the cavity as well, another 8 points, gives a real margin. Our model is a guide for a typical home of each age, not a prediction for yours: put in your own walls, loft, glazing and heating in the EPC calculator, or see the age guide linked in each row.

For the Victorian terrace and the solid-walled 1930s semi, the calculator picks solar panels over solid wall insulation: 8 points for £6,000 against 10 points for about £12,000. Solid wall insulation does more for comfort and bills, so if you are planning it anyway, see solid wall insulation cost.

A home with an older gas boiler, a thin loft and unfilled cavity walls has three big gaps. Our model fills them in order of cost per point: loft insulation (7 points), cavity wall insulation (8) and then the heating. A heat pump replacing a gas boiler over 15 years old adds 12 points and a new gas boiler 8; after the grant, the heat pump costs about £430 a point and the boiler about £440, which is why the calculator lists the heat pump.

The heating choice changes the total. For the 1930s semi with an older boiler, a new gas boiler in place of the heat pump still reaches band C, at 76 points instead of 80, for £6,925 in all instead of £8,625. For the Victorian mid-terrace it does not: a new boiler would leave it on 65, band D, so the heat pump is what gets it over the line. See what a heat pump would cost your home with the heat pump calculator, or a new boiler with the boiler cost calculator.

Electric heating, such as old storage heaters, is the weakest start for the rating but gains the most from a heat pump, about 20 points in our model, so the 1930s semi with electric heating reaches band C for less than the homes with an older gas boiler. Our estimate is least reliable for oil, LPG and electric heating, because a real EPC uses fixed fuel prices that our simple steps only approximate.

Points per pound is a good order for reaching a band, but not the only one. Grants can make insulation free: ECO4 pays for loft, cavity and solid wall insulation for households on qualifying benefits until 31 December 2026, and insulation, solar panels and heat pumps carry 0% VAT until 31 March 2027. Check what you qualify for with the grant checker, and how much an insulation job saves with the insulation calculator.

Do the fabric before the heating where you can. A better insulated home needs a smaller heat pump, and a smaller heat pump costs less to buy and run. The Boiler Upgrade Scheme guide explains the £7,500 grant, and heat pump cost by house type gives prices for each home.

Glazing and solid wall insulation are the dearest points. Replacing single glazing costs about £800 a point in our model, and internal solid wall insulation about £1,200. Both can still be worth doing for comfort, noise or damp, but they are rarely the cheapest way to change a letter on the certificate.

Many rented homes are there already: in 2024, 48% of privately rented homes in England were band C and 3% band A or B, according to the English Housing Survey. A home rated C or better on an EPC lodged before 1 October 2029 counts as compliant until that certificate expires, so a landlord who does the work and gets a new certificate before then is covered for up to 10 years.

In our examples, the 1930s semi that starts in band E with an older boiler reaches band C for £8,625, inside the cap. The Victorian end-terrace with an older boiler needs £11,575, more than the cap. In the landlord EPC calculator, heating controls, LED lighting and the heat pump fit within the cap, £5,575 in all, and take it to about band D; the solar panels would take it past the cap. If a home is still short after £10,000 has been spent, the landlord can register an exemption that lasts 10 years.

Two points to watch. First, grant money and other third-party funding count towards the cap, so a heat pump part paid for by the £7,500 grant may use up more of the cap than the net price in our tables. Second, the new standard puts fabric first, so the solar panels in our solid wall routes may not help with the first part of the test; the response also adds an exemption for landlords who choose not to fit solid wall insulation. Our calculators use today's rating, so treat band C in them as the target to plan for. The full rules, exemptions and grants are in our EPC guide for landlords.

• Find your current certificate on the GOV.UK EPC register. A home on 66 needs 3 points; one on 56 needs 13.
• Read the recommendations on the certificate. They are listed in order with the rating each step should reach, and our guide to what EPC recommendations cost prices them at today's rates.
• Have evidence ready for work the assessor cannot see. A cavity wall insulation guarantee is the big one: a filled cavity recorded as empty costs about 8 points in our model. Boiler details and loft depth matter too.
• Get a new EPC once the work is done, because the certificate does not update itself. An EPC costs £55 to £150 and lasts 10 years; see how much an EPC costs.

Bands and shares of homes by age: English Housing Survey 2024 live tables on energy performance (MHCLG, DA7101 and DA6201, updated 9 July 2026). Average rating, bands by tenure and the 2014 figure: English Housing Survey 2024 to 2025, chapter 2: energy efficiency (MHCLG, 29 January 2026).

Landlord rules: Improving the energy performance of privately rented homes: 2025 update, the government response and impact assessment (DESNZ, 21 January 2026), and the GOV.UK landlord guidance on the minimum energy efficiency standard.

Points and the cheapest route: our EPC calculator and landlord EPC calculator, which share one model, js/epc-plan.js. Upgrade costs: Energy Saving Trust insulation advice (May and June 2026), Energy Saving Trust windows and draught-proofing advice (May 2026) and Energy Saving Trust solar advice (August 2026); the new gas boiler from the DESNZ Boiler Upgrade Scheme 2026 to 2030 summary business case; heat pump prices from the Boiler Upgrade Scheme statistics. Bills by band from the DESNZ NEED consumption tables 2026 at the Ofgem price cap for October to December 2026. Full method on our methodology and data sources pages.