Opinion · Energy & Home
The Home Upgrade Payback Index 2026: what actually pays back, and what the industry oversells
The most heavily advertised home upgrades in Britain have some of the worst payback periods. The best-value one costs under £800, and nobody is knocking on your door to sell it.
Every week we watch what the UK is buying and ask the same unglamorous question: is it actually worth the money? For big-ticket home upgrades, the honest answer tends to embarrass the people selling them. Rank the upgrades British households pour money into by how fast they pay for themselves, and the order comes out almost backwards from how hard each one gets marketed.
The upgrades with vans, billboards and cold-callers behind them, like double glazing, big solar-and-battery packages and external wall cladding, mostly sit near the bottom. The ones that quietly return 30 to 40 per cent a year sit at the top. No salesperson will ever ring you about those, because there isn’t enough margin in a roll of loft insulation to pay for a sales team.
So we built the ranking the industry won’t. Below is the Look Into Home Upgrade Payback Index 2026: eleven common upgrades, ordered by simple payback period, using sourced 2026 UK costs, current grants and realistic annual savings. It is the map the brochures leave out.
| # | Upgrade | Typical cost | Grant | Saving / yr | Payback | Return* | Verdict |
|---|---|---|---|---|---|---|---|
| 1 | Loft insulation | £400–£800 | GBIS† | £195–£320 | ~2–3 yrs | ~40% | Elite |
| 2 | Draught-proofing | £150–£300 | none | £50–£100 | ~3 yrs | ~33% | Elite |
| 3 | EV home charger (7kW)‡ | £900–£1,400 | £350‡ | £600–£1,000 | ~1–2 yrs | high‡ | Strong |
| 4 | Cavity wall insulation | £1,000–£2,200 | GBIS† | £230–£395 | ~5 yrs | ~20% | Strong |
| 5 | Air source heat pump (replacing a dying boiler) | £500–£6,500 after £7,500 grant |
£7,500 | £100–£700 | near-immediate to 7 yrs | varies | Strong |
| 6 | Solar PV, 4kW (no battery) | £5,500–£7,000 | 0% VAT | ~£600 | ~10 yrs | ~10% | Strong |
| 7 | Solar + battery (4kW + 5kWh) | £10,000–£14,000 | 0% VAT | ~£800 | ~13–15 yrs | ~7% | Conditional |
| 8 | New gas boiler | £2,000–£4,500 | none | efficiency only | n/a | n/a | Necessity |
| 9 | Double glazing (whole house) | £4,000–£6,000 | none | £140–£175 | ~25–35 yrs | ~3% | Comfort, not cash |
| 10 | External solid wall insulation | £10,000–£18,000 | grant-led | £270–£435 | ~20–45 yrs | ~2.5% | Grant-only |
| 11 | Stairlift (straight / curved) | £2,300 / £5,500 | DFG§ | quality of life | n/a | n/a | Different logic |
*Return = estimated annual saving as a percentage of typical installed cost, a rough return-on-cost rather than a formal IRR. †GBIS = Great British Insulation Scheme; eligibility depends on property and income. ‡EV charger savings apply only if you already drive an electric car and charge at home instead of on public rapid chargers; the £350 grant is limited to renters and flat-owners. §DFG = Disabled Facilities Grant, means- and needs-tested. All figures are midpoints of sourced 2026 UK market ranges. See methodology and sources below.
The one-line takeaway
In 2026 the best-value home upgrade in Britain is loft insulation. It pays back roughly ten times faster than the double glazing advertised on every other billboard. As a rule, the cheaper and more boring the job, the better the maths.
The upgrades nobody advertises are the ones that win
Look at the top of the index. Loft insulation, draught-proofing, cavity wall insulation. They have three things in common: they are cheap, they are dull, and nobody has ever interrupted your dinner to sell you one. That last point is doing most of the explaining.
A roll of loft insulation costs £400 to £800, knocks £195 to £320 a year off a typical heating bill, and pays for itself inside three years. Call it a 40 per cent annual return, running for as long as the insulation sits up there doing nothing. Your bank will never offer you anything close. But the margin for an installer is measured in tens of pounds, so no industry exists to nag you about it, and most people never get round to it.
The best home upgrade in Britain costs less than a weekend away, and the only reason you haven’t done it is that nobody makes enough money selling it to remind you.
If you do nothing else this year, start with the boring three. They are the closest thing to free money in British home improvement, and every pound you put into insulation first makes everything you add later cheaper to run.
Solar is worth it, but not for the reason it’s sold
Solar panels are one of the better big-ticket buys, and we have said so before. A 4kW system at £5,500 to £7,000 saves a typical household around £600 a year and pays for itself in about a decade, then carries on producing for another fifteen years. Over 25 years a £6,000 array can return well over £15,000 in value. That case holds up.
The trouble starts when a battery goes on the quote. Now the price is £10,000 to £14,000 and the payback drifts out to thirteen or fifteen years, right about when components start needing attention. A battery earns its keep if you want energy independence, cheaper overnight charging, or a bit of resilience when the grid drops. It earns very little if a salesperson has framed it as the way to “maximise your savings”, because usually it doesn’t. Buy the panels on the numbers. Treat the battery as a lifestyle choice.
The heat pump is really a replacement decision
Heat pumps get sold two ways, and only one of them is honest. The sales version is “switch and save”. On a standard electricity tariff a heat pump saves a typical home just £100 to £200 a year against a modern gas boiler, so ripping out a perfectly good boiler to fit one leaves you waiting a decade or more to break even.
The honest version turns on timing. After the £7,500 Boiler Upgrade Scheme grant, an air source heat pump costs most people £500 to £6,500 installed, which is roughly what a new gas boiler costs anyway. Wait until your boiler dies, and the extra you pay to go heat pump instead can be close to nothing. Put it on an overnight tariff and you are saving £400 to £700 a year from the off. Heat with oil or LPG and the sums are better again, with paybacks of two to four years. Fit one when you would be spending the money regardless, not as a mid-life swap.
Double glazing is the most oversold “money-saver” in Britain
Here is the line that will annoy the most people. Judged on energy savings alone, whole-house double glazing is close to the worst-value upgrade on this list. A full set of A-rated uPVC windows for a three-bed semi runs £4,000 to £6,000 and saves somewhere around £140 to £175 a year. That is a payback of 25 to 35 years, longer than most people stay in the house.
Double glazing has a payback period longer than most people stay in their house. If you’re buying it to cut your energy bills, you’ve been sold the wrong reason.
None of which is a reason to avoid it. New windows transform comfort, cut condensation and kill outside noise, and they add maybe 5 to 10 per cent to what the property is worth, which dwarfs the energy saving. Just be honest about the pitch. Windows are about how the house feels and what it fetches, not what happens to your gas bill. External solid wall insulation falls the same way, only making financial sense with grant funding or when you are already deep in a renovation.
Some upgrades aren’t investments at all, and that’s fine
Two entries near the bottom do not belong in the payback conversation, and it is worth saying so plainly. A new gas boiler is a necessity. You replace it because the old one failed, and the only questions are efficiency and reliability. A stairlift, about £2,300 for a straight run and around £5,500 curved, is bought for independence, and it can be part-funded by a Disabled Facilities Grant. Scoring either on “annual return” would be daft.
We list them precisely because the industry likes to blur the line, bolting a savings story onto a purchase that was never about money. A boiler keeps you safe. A stairlift keeps you free. Neither needs a payback period to justify it, and anyone who invents one for you is worth a second look.
The one rule this index gives you
If you take a single thing from all this, take this: work down the list from the top, and turn up your suspicion in proportion to how hard something is being sold to you. Insulate and draught-proof before anything else, because it is the best-value work in the house and it makes everything above it cheaper to run. Add generation if your roof suits it. Move to a heat pump when the boiler is on its way out. Buy windows, cladding and batteries for comfort, resilience and resale, with your eyes open about the bills, because the bills barely move.
The brochures have the running order upside down. You don’t have to.
How we built the index (methodology)
Each upgrade is ranked by simple payback, meaning typical installed cost divided by estimated annual saving, using midpoints of 2026 UK market ranges. Costs assume a standard installation on a typical three-bed semi where relevant. Savings use current energy prices and lean conservative, favouring realistic figures over best-case ones. “Return” shows the annual saving as a percentage of the upfront cost. It is a rough return on cost rather than a formal internal rate of return, and it ignores maintenance, degradation and finance costs. Grants (the £7,500 Boiler Upgrade Scheme, 0% VAT on qualifying measures, the Great British Insulation Scheme, the EV Chargepoint Grant and the Disabled Facilities Grant) all carry eligibility rules that vary by property, income and location, so check the current criteria before you budget. Treat the figures as a guide for prioritising spending, not a personalised quote. Look Into is reader-supported and never paid to recommend a product or installer.
Frequently asked questions
What is the best-value home upgrade in the UK in 2026?
Loft insulation. It usually costs £400 to £800 installed, saves an estimated £195 to £320 a year, and pays for itself in two to three years, which works out at roughly a 40% annual return on the cost. Draught-proofing (£150 to £300, saving £50 to £100 a year) is close behind. Neither gets marketed hard, because there isn’t the margin to fund a sales team.
Are solar panels worth it in the UK in 2026?
Yes for most homes with a decent roof, as a long-term saving rather than a quick win. A typical 4kW system costs about £5,500 to £7,000 and saves roughly £600 a year, so it pays back in around ten years and keeps earning across a 25-year life. Add a battery and the cost jumps to £10,000 to £14,000 with payback out at thirteen to fifteen years, so batteries are more about energy independence than pure economics.
Does a heat pump actually save money versus a gas boiler?
Only modestly, and mainly if you get the timing right. After the £7,500 Boiler Upgrade Scheme grant an air source heat pump costs most homeowners £500 to £6,500, comparable to a new gas boiler. Running costs usually come in £100 to £200 a year lower on a standard tariff, or £400 to £700 lower on an overnight tariff. The economics work best when your boiler has died anyway, or if you currently heat with oil or LPG (payback of two to four years).
Is double glazing worth it for energy savings?
Not on energy savings alone. Replacing single glazing with A-rated uPVC double glazing across a three-bed semi costs £4,000 to £6,000 but saves only about £140 to £175 a year, a payback of roughly 25 to 35 years. Buy it for comfort, quiet and the 5 to 10% uplift in property value, not to cut your bills.
Which home upgrade has the worst payback period?
External solid wall insulation, at roughly 20 to 45 years on energy savings alone, and whole-house double glazing at 25 to 35 years. Both can still be worth doing for comfort, property value or as part of a bigger renovation. Just not as money-savers.
In what order should I upgrade my home?
Work down the index from the top. Do loft insulation and draught-proofing first, then cavity wall insulation, because they are the best value and they cut the running cost of everything else. Add solar if your roof suits it. Switch to a heat pump when the boiler needs replacing rather than before. Treat windows, external cladding and batteries as comfort-and-value buys, not bill-cutters.
Sources & further reading
- Look Into, Solar Panel Costs UK 2026 (system costs, savings, payback; DESNZ installation data)
- UK Home Energy, Heat Pump Costs UK 2026 (install cost, BUS grant, running-cost comparison)
- UK Home Energy, Home Insulation Costs UK 2026 (loft, cavity, solid wall, draught-proofing)
- ExpertSure, Double Glazing Cost UK 2026 (per-window and whole-house cost, Energy Saving Trust savings)
- Stairlift Price Watch, Stairlift Prices UK 2026 (straight and curved averages)
- Grants: Boiler Upgrade Scheme (£7,500), Great British Insulation Scheme, EV Chargepoint Grant (£350), Disabled Facilities Grant. See GOV.UK for current eligibility.
Look Into is reader-supported. We may earn a commission from qualifying purchases, but we are never paid to recommend a product, and our rankings are decided independently. Figures are guidance, not financial advice. Confirm current prices and grant eligibility before committing.