How to Improve Your EPC Rating in the UK: Practical Steps
Did you get an EPC certificate recently? You might have stared at it and felt confused. There is a colourful chart. There is a letter grade. And there is a list of “recommended improvements” that is hard to understand.
You are not alone.
Once you understand your EPC, it becomes very useful. It is basically a guide to saving money on energy bills. Right now, the average UK household pays £1,641 a year on gas and electricity. That is a lot of money. Improving your EPC rating can help you spend less.
What Is an EPC Rating?
An Energy Performance Certificate rates how energy efficient your home is. The scale goes from A to G. A is the best. G is the worst. Think of it like the sticker on a new washing machine, but for your whole house.
A government-approved assessor visits your home. They look at things like insulation, heating, windows, and lighting. Then they give your home a score.
Your certificate also includes a list of recommended improvements. These are shown in order of cost-effectiveness. Most people never read this list. But it tells you exactly what to fix first. It also tells you roughly what it will cost and how much you could save.
That list is where the value is.
Where Does the Average UK Home Sit?
The average UK home has a D rating. This reflects years of under-investment in insulation and heating upgrades.
A D-rated home (55–68 points) usually has basic double glazing and some loft insulation. But it still uses gas heating. Annual energy bills are typically £1,500–£1,800.
A C-rated home costs around £1,100–£1,400 a year to run. That is a saving of up to £700 a year, just by moving up one band.
The difference gets even bigger for new builds. New-build homeowners pay around £1,574 per year on energy. Homeowners in older properties pay closer to £1,995.
Why Should You Improve Your EPC Rating?
Here are four clear reasons.
It Saves You Money Every Year
Moving from D to C can reduce your annual energy bills by £400–£800. That saving happens every year. It is not a one-off.
It Increases Your Home’s Value
Research shows that homes rated C or above sell for 5–8% more than lower-rated homes. They also sell faster.
On a £250,000 home, that is an extra £12,500–£20,000. Upgrading from F to C has been shown to add up to £56,000 in property value.
The Government Is Raising the Rules
If you are a landlord, this is important. In January 2026, the government announced that the minimum EPC standard for rented homes will rise to C by October 2030. Currently, 52% of private rented homes are below C. Failing to comply can result in fines of up to £5,000 per property.
Homeowners should also take note. The government’s Warm Homes Plan wants all homes to reach at least EPC C by 2030.
The EPC System Is Changing Soon
From October 2026, EPCs will use a new format. Instead of one letter grade, there will be four ratings:
- Energy Cost Rating
- Fabric Performance Rating
- Heating System Rating
- Smart Readiness Indicator
The new system rewards real, well-rounded improvements. Getting ahead of this change now is a smart move.
How to Improve Your EPC Rating: The Practical Steps
Here are the best EPC improvement tips. They are organised from cheapest to most expensive.
Quick Wins Under £500
These are the best place to start. They are low cost and easy to do. Together, they can add 10–20 SAP points for under £1,000. That is often enough to move up one full band.
Switch to LED Lighting (£50–£200 | 2–5 points)
Replace all halogen or old bulbs with LED bulbs. This is one of the easiest improvements you can make. It takes an afternoon. It costs very little. And it saves money on electricity straight away.
If your EPC says less than 75% of your lights are low-energy, upgrading them will improve your score.
Draught Proofing (£30–£300 | 1–3 points)
Seal gaps around windows, doors, letterboxes, and pipes. You can buy draught strips from any DIY shop for as little as £30. A professional job for the whole house costs £100–£300.
A draughty house is like trying to fill a bath with the plug out.
Hot Water Cylinder Jacket (£20–£50 | 1.5–2 points)
Do you have an old, bare hot water tank? A new insulation jacket costs just £20–£50. It takes about 15 minutes to fit. The saving on your SAP score is surprisingly high for such a cheap fix.
Twenty pounds. Fifteen minutes. Done.
Upgrade Your Heating Controls (£100–£400 | 2–8 points)
Heating controls include thermostatic radiator valves (TRVs), a room thermostat, and a timer. If your EPC flags these as missing, adding them gives a great return on investment.
TRVs on all radiators typically cost £100–£250 installed. A smart thermostat like Nest or Hive costs £150–£300 installed. Going from no controls to a full set can add 5–8 SAP points.
Top Up Your Loft Insulation (£250–£600 | 5–10 points)
If you have no loft insulation, this should be your first priority. Adding 270mm of insulation can improve your rating by 10–15 points. That alone could move you up an entire band.
Even if you already have some insulation, it may be worth checking. Older installations are often only 100mm deep. The recommended level is 270mm.
You can buy mineral wool rolls from any DIY store. You can lay them yourself over a weekend.
Mid-Range Upgrades: £500–£3,000
Done the cheap steps? Still need more points? These improvements offer serious gains.
Cavity Wall Insulation (£400–£1,500 | 10–15 points)
If your home was built between the 1920s and 1990s, it likely has cavity walls. Filling these walls with insulation is one of the best investments you can make. It can save £295 per year for a typical semi-detached house.
The good news is that this is often fully funded through the ECO4 or Great British Insulation Scheme. Check your eligibility before you spend anything.
New Condensing Boiler (£1,000–£3,000 | 5–10 points)
If your boiler is old and your EPC flags it as inefficient, a new condensing boiler can help. It can add 5–10 EPC points.
But remember: always insulate first. A new boiler in a poorly insulated home is wasteful. Fix the fabric of the building first. Then upgrade the heating. This is called the “fabric first” approach.
Double Glazing (£3,000–£7,000 | 5–10 points)
Double glazing adds 5–10 points and makes the home feel much more comfortable. However, it is expensive. If you already have double glazing, this is probably not where your money should go.
Big Ticket Upgrades: £4,000+
These are the most powerful improvements. They cost more upfront. But they are essential if you need to jump from E to C.
Solid Wall Insulation (£4,500–£13,000 | 15–25 points)
If your home was built before the 1920s, it likely has solid walls. There is no cavity to fill. Solid wall insulation is often the only way to get big insulation gains. It can be fitted inside or outside the home. A semi-detached house can save around £330 per year after installation.
Air Source Heat Pump (£7,000–£13,000 before grant | 10–15 points)
A heat pump can significantly improve your EPC score and cut carbon emissions. But it works best in a well-insulated home. Do not install a heat pump in a draughty house. Insulate first. Then consider a heat pump.
The £7,500 Boiler Upgrade Scheme grant is currently available. And the insulation condition has recently been removed. So it is now easier to qualify than before.
Solar Panels (£5,000–£11,000 | 5–15 points)
Solar panels can improve your EPC rating by 8–15 points. After the initial cost, they reduce your energy bills significantly. Typical savings are around £360 per year. The average installation cost is around £6,100.
Quick Reference: Priority Improvement Table
| Improvement | Typical Cost | EPC Points Gained | Best For |
|---|---|---|---|
| LED lighting | £50–£200 | 2–5 | Everyone |
| Draught proofing | £30–£300 | 1–3 | Older homes |
| Hot water cylinder jacket | £20–£50 | 1.5–2 | Homes with tanks |
| Heating controls | £100–£400 | 2–8 | Missing controls |
| Loft insulation (270mm) | £250–£600 | 5–10 | Under-insulated lofts |
| Cavity wall insulation | £400–£1,500 | 10–15 | 1920s–1990s builds |
| New condensing boiler | £1,000–£3,000 | 5–10 | Old boilers (15yr+) |
| Double glazing | £3,000–£7,000 | 5–10 | Single-glazed homes |
| Solid wall insulation | £4,500–£13,000 | 15–25 | Pre-1920s solid walls |
| Air source heat pump | £7,000–£13,000 | 10–15 | Well-insulated homes |
| Solar PV panels | £5,000–£11,000 | 5–15 | Good roof orientation |
The first five measures can deliver 12–28 SAP points for under £1,500. For most D-rated homes, that is enough to reach EPC C.
What Does It Cost to Reach EPC C?
The government estimates the average cost of upgrading to EPC C is between £6,100 and £8,000 per home. However, costs vary depending on property type and age.
Not everyone needs to spend that much. Most E-rated properties can reach D for under £2,000. Many D-rated properties can reach C for £3,000–£8,000.
And if you are on a tight budget, start small. LED lighting, draught proofing, loft insulation, and a cylinder jacket combined can deliver 8–15 SAP points for under £500. That is often enough to move up one band.
Grants and Free Help Available
Many people miss out on free money. Here is what is available right now.
ECO4 Scheme (Ending December 2026)
ECO4 helps households get free insulation and heating upgrades. It covers loft insulation, cavity wall insulation, solid wall insulation, heating upgrades, and first-time central heating.
To qualify, your household usually needs to receive a benefit such as Universal Credit or Pension Credit. Your home also needs to be rated D, E, F, or G. A local authority route is also available for households in fuel poverty.
These are grants. You do not need to pay them back.
Boiler Upgrade Scheme (£7,500 Towards Heat Pumps)
This scheme offers up to £7,500 towards heat pump installation. The insulation condition has recently been removed. This makes it much easier to qualify than before.
Warm Homes Plan (New in 2026)
The Warm Homes Plan is a £13.2 billion government programme. It aims to upgrade 5 million UK homes by 2030. It offers grants for low-income households and low-interest loans for others.
To qualify for the Warm Homes Local Grant, your household income must be £36,000 or less. Or you must live in an eligible postcode or receive qualifying benefits. Your home must be privately owned and rated D–G.
For Landlords
The government has set a spending cap of £10,000 per property for landlords. This means you will not be expected to spend more than this to reach EPC C. Landlords can also access ECO4 funding and the Boiler Upgrade Scheme for rental properties.
Which Improvements Work Best for Your Property Type?
1960s–1980s Homes
These homes are often the easiest to improve. They have cavity walls ready for filling. The loft is easy to access. In many cases, cavity wall insulation plus loft top-up plus heating controls can push you from D to C for £2,000–£4,000.
Pre-1920s Solid Wall Homes
These are trickier. There is no cavity to fill. Solid wall insulation is expensive but often the only route to a big improvement.
Post-2000 Builds
These homes are already well insulated. There is less room to improve. Solar panels are usually the best option to move from B towards A.
Your Step-by-Step Plan
Follow these steps in order.
Step 1: Check your current EPC. Go to the government’s free EPC register. Find your property. Note your current score, your potential score, and every recommended improvement.
Step 2: Identify the gap. If your current rating is D 65 and your potential is C 72, you need just 7 more points. If your current rating is E 45 and your potential is C 74, you need 29 points. The plan looks very different in each case.
Step 3: Check your grant eligibility. Before spending anything, check whether you qualify for ECO4, the Boiler Upgrade Scheme, or the Warm Homes Local Grant. Free money should always come first.
Step 4: Start with low-cost wins. LED bulbs, draught proofing, cylinder jacket, heating controls, and loft insulation. Together, these can deliver 10–20 SAP points for under £1,000.
Step 5: Add mid-range measures if needed. Cavity wall insulation and a new boiler are the next step. Often one of these, combined with the low-cost measures — is enough to cross the line.
Step 6: Consider big-ticket upgrades last. Heat pumps, solid wall insulation, and solar panels are excellent. But only consider them if cheaper measures have not already got you there.
Step 7: Get a new EPC. Your EPC does not update automatically after improvements. You need to book a fresh assessment. It usually costs £60–£120.
Big Changes Are Coming: The New EPC System
This is important. The UK government has announced the biggest EPC overhaul since 2007.
The current single A–G rating will be replaced by four separate metrics. These are: Fabric Performance, Heating System, Energy Cost, and Smart Readiness. The new format is expected to launch in late 2026 or 2027.
Here is the key point. If you improve your EPC now, under the current system, you are locked in for up to 10 years. Wait too long and you may face tougher criteria under the new system.
Properties that already hold an EPC C rating before the reforms take effect will be treated as compliant until their existing EPC expires.
The Bottom Line
Your EPC is not just a piece of paper. It is a roadmap. It tells you what to fix, what it will cost, and how much you will save.
Start with the cheap improvements. Stack them together. Check for grants before you spend your own money. Only move on to expensive measures if the affordable ones are not enough.
Whether you are a homeowner who wants lower bills, or a landlord preparing for the 2030 deadline, the best time to act is now. The improvements pay for themselves. The grants will not last forever. And the new EPC system is coming soon.
That is exactly what Low Energy Supermarket is here to help with. We were founded by Mark, a Chartered Building Surveyor with over a decade of experience as a Domestic and Commercial Energy Assessor. He noticed that EPC-recommended products were often hard to find or overpriced. So we made them easy to find, affordable, and genuinely effective.
If you are ready to start ticking off your EPC recommendations, browse our range of energy efficiency products. We stock LED bulbs, draught excluders, insulation, water-saving gadgets, and more. All chosen because they work, they are affordable, and they will help you improve your EPC rating, one practical step at a time.