BY BAND GUIDE
EPC Rating D 2026: Grants & Upgrades You Can Get
An EPC rating of D means your home is slightly below average efficiency but sits in a sweet spot for grant eligibility.
Check eligibilityLast updated May 2026
An EPC rating of D means your home is slightly below average efficiency but sits in a sweet spot for grant eligibility.
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In short
An EPC rating of D means your home is slightly below average efficiency but sits in a sweet spot for grant eligibility. You can access ECO4 (fully funded upgrades if you're on qualifying benefits), the Boiler Upgrade Scheme (£7,500 off a heat pump), and Warm Homes: Local Grant funding. Most D-rated homes can reach band C for £2,000 to £8,000 depending on what's needed.
Reviewed against primary sources
Last reviewed: 16 May 2026 · Next review due: 14 August 2026
About 27% of homes in England sit at band D. See our guide on solid wall insulation upgrades for more detail. See our guide on EPC rating C monthly costs for more detail. That's roughly 6.5 million properties, making it the second most common rating after C, according to the English Housing Survey.
So if your certificate says D, you're not in trouble. You're in the middle of the pack. Your home scores somewhere between 55 and 68 on the SAP scale, which means it's losing more heat than it should but isn't in the dire territory of E, F, or G. Your energy bills are probably £200 to £400 per year higher than they'd be if you were sitting at band C, though that number shifts depending on your heating system, insulation levels, and whether your walls are solid or cavity.
Here's what your D rating actually tells you in practical terms:
| What it means | What it doesn't mean |
|---|---|
| Your home leaks more heat than average | Your home is unsafe or uninhabitable |
| You're paying more than you need to on energy | You need to upgrade immediately |
| You qualify for most government grant schemes | Your home can't be improved affordably |
| A landlord would need to improve to E minimum | You'll struggle to sell the property |
The real story with band D is that you're close to C. Often one or two upgrades will push you over the line, and those upgrades tend to be the cheapest ones on the list. For a full breakdown of every band and what it means, our guide to EPC ratings explained covers the lot.
Three live schemes. That's what you've got to work with right now.
ECO4 is the big one for lower-income households. If you're receiving benefits like Universal Credit, Pension Credit, or Child Tax Credit, ECO4 can fully fund insulation, heating upgrades, and other efficiency measures. It runs until December 2026, so the window is narrowing. We'll cover eligibility in detail below.
The Boiler Upgrade Scheme is open to everyone regardless of income. It knocks £7,500 off the cost of an air source heat pump, £7,500 off a ground source heat pump, and £5,000 off a biomass boiler. You don't need to be on benefits. You just need a home with an existing fossil fuel heating system. The scheme runs until 2030 under the Warm Homes Plan.
Warm Homes: Local Grant is the newest addition and works differently from council to council. Some local authorities are offering insulation packages, others are funding heating replacements, and a few are doing both. Amounts vary, which is frustrating but also means it's worth checking what your specific council is offering. Our Warm Homes Plan guide breaks down how the local grant works and how to find your council's scheme.
And then there's one that's gone. The Great British Insulation Scheme closed in March 2026. If you've seen it mentioned on other sites as still available, that information is out of date. It previously offered up to £3,000 towards insulation but is no longer accepting applications.
So your practical options come down to: ECO4 if you're on qualifying benefits, BUS if you want a heat pump, and Warm Homes: Local Grant regardless of income but subject to what your council is running.
£300 to £600. That's what loft insulation top-up costs, and for many D-rated homes, it's enough to jump one full band.
Not every D-rated home needs the same work, obviously. But the EPC certificate itself gives you a clue. Page three of your certificate lists recommended improvements in order of cost-effectiveness, with estimated savings for each. Start there.
The upgrades that move D-rated homes to C most often:
Loft insulation top-up. If you've got less than 100mm up there (common in homes insulated in the 1980s), topping up to 270mm costs £300 to £600 and typically adds 5 to 10 SAP points. That alone can push a mid-range D into C territory.
Cavity wall insulation. If your home has unfilled cavity walls, this is the single biggest efficiency gain available. £800 to £1,500 for a typical semi, and it can add 10 to 15 SAP points. Our cavity wall insulation guide covers the process and what to expect.
Heating controls upgrade. Adding a room thermostat, TRVs on radiators, and a programmer if you don't have one. £200 to £400. Modest SAP improvement but cheap.
Boiler replacement. Swapping a G-rated boiler for an A-rated condensing boiler adds 5 to 10 SAP points. Cost is £2,000 to £3,500 without a grant. If you're considering a heat pump instead, our boiler grants guide covers every funding route.
LED lighting throughout. This sounds trivial but the SAP calculation does count it. Replacing all halogen and old CFL bulbs with LED costs under £100 and adds 1 to 3 points. It won't transform your rating on its own, but it stacks.
Here's the honest bit: for most D-rated homes, loft insulation plus one other measure gets you to C. Total cost is typically £1,000 to £3,000 out of pocket if you're paying yourself, and potentially nothing if you qualify for ECO4.
This is where it gets interesting for D-rated homes specifically.
ECO4 targets homes rated D to G, so you're within the eligible band range. But the EPC rating alone isn't enough. You also need to be receiving a qualifying benefit. The list includes Universal Credit, Pension Credit, Income Support, income-based Jobseeker's Allowance, income-related Employment and Support Allowance, Child Tax Credit (with income under £16,190), Working Tax Credit (with income under £16,190), and Housing Benefit.
If you tick both boxes, D-rated EPC and qualifying benefit, ECO4 can fund the full cost of upgrades like loft insulation, cavity wall insulation, solid wall insulation, a new boiler, or even a first-time central heating system. The scheme is delivered through energy suppliers, who appoint approved installers to carry out the work.
One thing we see people get confused about: you don't apply to the government directly. You go through an energy supplier's ECO4 programme or through an approved installer who manages the process. Our eligibility checker can tell you in about two minutes whether you're likely to qualify.
The scheme runs until December 2026. That sounds like plenty of time, but installation slots fill up as the deadline approaches. Suppliers have targets to meet, and the closer they get to those targets, the pickier they become about which homes they'll fund. If you think you qualify, check now rather than in October.
Honestly, this one depends on your situation and we can't give you a straight answer without knowing your benefits status. But if you are on qualifying benefits, ECO4 is the most generous energy efficiency scheme running in the UK right now. Full stop.
Yes. No income test, no EPC band restriction.
The Boiler Upgrade Scheme doesn't care whether you're band D or band B. If your home currently has a fossil fuel heating system (gas boiler, oil boiler, LPG, electric storage heaters in some cases), you can get £7,500 towards an air source heat pump or ground source heat pump. The grant goes directly to your MCS-certified installer, who deducts it from your quote.
Typical costs after the grant for a D-rated home:
| System | Typical total cost | After BUS grant | You pay |
|---|---|---|---|
| Air source heat pump | £10,000 to £14,000 | Minus £7,500 | £2,500 to £6,500 |
| Ground source heat pump | £18,000 to £28,000 | Minus £7,500 | £10,500 to £20,500 |
Now, here's something worth flagging. A D-rated home with poor insulation will need a larger heat pump to maintain comfortable temperatures, which pushes the price up. Most installers will strongly recommend insulating first, then fitting the heat pump. This isn't upselling. A well-insulated home needs a smaller, cheaper heat pump that runs more efficiently and costs less to operate. The MCS installation standards actually require a heat loss assessment, and if your home leaks too much heat, the installer may refuse to fit a system that would be undersized.
So the smart sequence for a D-rated home is: insulate first (potentially free through ECO4 if you qualify), then apply for BUS. You can read more about whether heat pumps are worth the investment in our separate analysis.
The scheme runs until 2030 under the Warm Homes Plan.
Right, so you've checked your EPC and you want to improve it. Here's the order that makes financial sense for most D-rated homes.
Start with the cheap wins. Loft insulation, draught-proofing, LED lighting, and heating controls. These cost under £1,000 combined and often deliver 8 to 15 SAP points. For many D-rated homes, that's enough.
If you're still in band D after those, the next step depends on your wall type. Cavity walls? Get them filled. It's the single most cost-effective upgrade for unfilled cavity homes. Solid walls? That's a bigger project. Internal wall insulation costs £5,000 to £12,000, while external wall insulation runs £8,000 to £22,000. Neither is cheap, but both can add 15+ SAP points.
Interestingly, the EPC assessment weighs some measures more heavily than others. Hot water cylinder insulation, for instance, scores surprisingly well relative to its cost (about £20 for a jacket). If your cylinder isn't insulated, that's essentially free points.
And if you're a landlord, there's an extra reason to care. The Minimum Energy Efficiency Standards already require rental properties to be band E or above, and the government has signalled that this will tighten to band C by 2030. Getting ahead of that now, while grants are available, makes more sense than scrambling later when every landlord in the country is competing for the same installers.
Our full guide on how to improve your EPC rating ranks every upgrade by cost per SAP point gained. Worth a look before you commit to anything expensive.
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