If you're putting your home on the market, a better EPC rating is a real selling point. Here are the improvements that move the needle, ordered by cost.
This is the easiest improvement and often the most overlooked. Replacing halogen and incandescent bulbs with LEDs improves the EPC score modestly but reliably. A house with 20 bulbs costs maybe £40 to convert. The assessor will notice and credit it.
If you've got loft insulation, make sure the assessor can actually see it during the visit. If the loft hatch is sealed up or buried under stuff, they can't credit insulation they can't verify. Same applies to cavity wall insulation: have documentation ready if you've had it installed.
Boiler installation certificates, windows installation invoices, insulation certificates, smart heating controls. Anything that proves a more efficient system or material than the default. Without evidence, assessors have to assume the worst-case (or in some cases default values), which is often worse than reality.
If your loft has insulation but it's less than 270mm thick (the current recommended depth), topping it up is one of the most cost-effective improvements. Rolls of mineral wool insulation are inexpensive, and for many homeowners it's a DIY weekend job. Materials cost £200 to £500 for a typical house. Score impact is meaningful, especially if you're starting from a low base.
If you have an unjacketed or thinly jacketed hot water cylinder, fitting a properly thick insulating jacket is cheap (under £30) and bumps the score.
Programmable thermostats and smart heating controls (Nest, Hive, Tado, and similar) are recognised by the EPC methodology. They're a relatively low-cost upgrade if your existing controls are basic, and they provide ongoing energy savings as well as the rating bump.
Sealing gaps around doors, windows, and floorboards is cheap and effective. Brush strips, foam tape, and silicone sealant cost very little. The EPC methodology doesn't always pick up on draught-proofing as much as it should, but combined with the genuine improvement to occupant comfort, it's worth doing.
If your home has uninsulated cavity walls (common in many homes built between the 1930s and 1980s), filling the cavity is one of the highest-impact improvements available. Typical cost is £400 to £1,500, depending on house size. Score impact is significant.
Note that not all cavity walls are suitable, particularly in exposed locations or properties already showing signs of damp.
If you still have single glazing, replacing it with double glazing is a substantial improvement, although a major cost (£5,000 to £15,000+ for a whole house). Worth doing for comfort and bills as well as EPC score. For listed buildings or those in conservation areas, consider secondary glazing as an alternative that may achieve similar results without planning issues.
If your boiler is older than 15 to 20 years, replacing it with a modern condensing boiler will improve the EPC score and almost certainly reduce running costs. Cost is typically £2,500 to £4,500 installed.
Photovoltaic (PV) solar panels are recognised by the EPC methodology and can substantially improve the rating, particularly if combined with battery storage. Costs have come down considerably. A typical residential installation is £4,000 to £8,000. Beyond the EPC bump, you'll see real bill savings.
Switching from gas, oil, or electric heating to an air-source or ground-source heat pump dramatically improves the rating and qualifies for government grant support through the Home Energy Scotland scheme (interest-free loans up to £38,000 per property at time of writing). It's a big change with a long payback, but it's the direction Scotland is heading.
Cosmetic improvements have no effect on the EPC, even though they're often the first things sellers think about. The rating is purely about energy performance, not how nice the property looks.
Walls are not factored into the EPC. Painting doesn't change the rating, though it helps with photos for the listing.
Doesn't affect the rating directly. If new flooring includes underfloor insulation, that does count, but the floor finish itself doesn't.
If you're working through a list, the smart order is:
For most properties, the first three steps will move the rating up by one band, sometimes two, for relatively modest spend.
If you're not sure where to focus, the best starting point is to get a current EPC. The certificate includes the recommendations section with estimated costs and rating impacts for your specific property. You can then prioritise which improvements give you the best return for your goals.
Book a domestic EPC and we'll talk through the rating, what's affecting it, and what improvements would help most.
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