From 24 March 2027, solar panels on new builds in England will be mandatory under the Future Homes Standard — but the rules only apply to newly constructed homes, not yours. So why does this matter to existing homeowners? Because it quietly shifts the resale maths in ways most people haven't thought through yet.
Are solar panels mandatory on new builds from 2027?
Yes, in almost all cases. The Future Homes Standard, published in March 2026, introduces a new requirement under Part L of the Building Regulations in England. From 24 March 2027, new homes must generate enough on-site renewable electricity to cover the equivalent of roughly 40% of their ground floor area in solar PV panels — which, in practice, means rooftop solar on virtually every plot. Exceptions are limited to roofs with substantial, unavoidable shade overhead; cost, aesthetics, or roof complexity are not valid grounds for exemption.
To put that in concrete terms: the Standard effectively mandates a 4–5kWp solar system on a typical three-bedroom home — roughly 8–10 panels per property. That is a genuinely useful installation, not a token gesture. The old rules allowed developers to fit minimal arrays to tick energy targets; the new ones close that loophole entirely.
It is worth noting that the Future Homes Standard applies to England only. Building regulations are devolved, so Scotland, Wales, and Northern Ireland have their own frameworks and timetables.
What does the Future Homes Standard mean for my existing house?
Nothing in law — the Standard does not require you to retrofit anything. Existing homes stay under the regulations they were built under, and there is no obligation to add solar or replace your boiler. But here is the practical reality that matters to any homeowner thinking about a future sale.
By the early 2030s, the bulk of new-build stock coming onto the market will arrive with rooftop solar, a heat pump, and often a battery as standard. That changes what a well-specified older home looks like to a buyer comparing their options. Right now, solar on an existing home is a differentiator. In a few years, the absence of it risks becoming a drawback — at least in the eyes of energy-conscious buyers, mortgage lenders, and EPC assessors.
Will not having solar panels hurt my home's resale value after 2027?
Possibly — and the evidence is already pointing that way before the mandate kicks in. A 2024 peer-reviewed study by Swansea University, analysing roughly five million UK property transactions, found that homes with solar panels sold for between 6.1% and 7.1% more on average than comparable homes without them. On a typical UK home, that translates to a meaningful premium at the point of sale.
The EPC angle matters too. Solar panels typically push a home up by one or two EPC bands — most commonly from D to C — and that band shift has its own value. Rightmove research found that moving from EPC band D to C adds roughly 3% to average UK house prices in some regions, with larger effects recorded elsewhere. Buyers on portals like Rightmove and Zoopla can now filter listings by EPC band, which means a D-rated property is invisible to a portion of the buyer pool before they even see your listing.
The mortgage market is reinforcing this trend. Several major lenders already offer preferential rates — or cashback — for homes rated EPC C or above. A buyer comparing two similar properties may find that the solar-equipped one unlocks better borrowing terms, which directly affects what they can afford to offer.
To be straight with you: the premium from solar is not guaranteed, it is not uniform, and it varies by location, system size, and condition. Our guide on whether solar panels add value to your home in the UK covers this in more detail, including when the sums are less convincing. There are also homes where retrofit solar is genuinely not worth it — a heavily shaded north-facing roof, a property you plan to sell in two years before payback kicks in, or a very low electricity bill. We will come back to those caveats.
Two deadlines landing at once: the VAT window closes when the mandate begins
Here is an underappreciated collision of timing. The Future Homes Standard comes into force on 24 March 2027. The 0% VAT rate on residential solar installations — confirmed under HMRC VAT Notice 708/6 — is currently due to expire on 31 March 2027, after which the rate is expected to revert to 5%. As of September 2026, the government has not indicated any intention to extend the zero rate beyond that date, according to the House of Commons Library.
What that means in practice: if you install solar before the end of March 2027, you currently pay 0% VAT on the full supply-and-fit package — panels, inverter, battery, labour, and scaffolding. After April 2027, you are likely looking at 5% on top of the installation cost. On a typical install costing £8,000–£12,000, that is a real cash difference.
The 0% VAT rate is already baked into every quote you receive from a reputable installer today, so you do not need to claim it separately — it just shows up in the price. Our guide on 0% VAT on solar panels and the March 2027 deadline has the full detail on what qualifies and what does not.
What does electricity actually cost right now — and why does it matter for payback?
The payback calculation for solar depends heavily on the unit rate you pay for electricity. Under the current Ofgem price cap for October to December 2026, the average unit rate for electricity is around 26.32p per kWh for a typical direct debit customer (this varies by region). Every unit your panels generate is a unit you do not buy at that rate — and any surplus you export to the grid earns you money through the Smart Export Guarantee (SEG), on top of that.
A typical 3–4kWp system on a reasonably well-positioned south- or south-west-facing roof might save a 3-bedroom household somewhere in the range of £500–£900 a year on electricity bills, depending on usage patterns, location, and how much of the solar generation is consumed directly at home rather than exported. That is a worked example, not a promise — your actual saving will depend on your home. For a more detailed breakdown by house type and usage, see our guide on solar panel payback time in the UK for 2026.
When retrofit solar genuinely might not be worth it
We said we would be honest about this, so here it is. Solar panels are not the right call for every existing home. You should think carefully before proceeding if:
- Your roof is heavily shaded — by trees, a chimney, or neighbouring buildings — for most of the day. Shade dramatically reduces output, and no amount of optimism changes physics.
- Your roof faces north or near-north and there is no viable alternative pitch. East–west splits work reasonably well; true north-facing roofs rarely stack up financially.
- You plan to move within two or three years. If you will not own the home long enough to recoup a meaningful portion of the install cost through savings, the resale premium needs to carry all the weight — and while the evidence is encouraging, it is not guaranteed in every market.
- Your electricity bill is unusually low. If you are already a very light user, the saving per year is smaller and the payback period stretches out.
- Your roof needs replacing soon. It is usually worth sorting the roof first, or doing both at the same time — our guide on solar panels when re-roofing explains the options.
If none of those apply — you have a reasonable south, south-east, or south-west facing roof, a moderate-to-high electricity bill, and you are planning to stay put — then the economics are generally solid, and the Future Homes Standard mandate only strengthens the long-term case.
The honest bottom line for existing homeowners
The Future Homes Standard solar mandate does not touch your home directly. But it changes the context your home sits in. From 2027, every new home your buyer might have considered instead will come with solar fitted as standard. That matters for resale, EPC ratings, and how energy-literate buyers perceive older stock.
If you are already leaning towards solar and your roof is suitable, two things make acting before March 2027 worth considering seriously: the 0% VAT window, which closes the same week the mandate kicks in, and the fact that installer capacity is likely to tighten as the new-build supply chain ramps up to meet the FHS deadline.
If you are not sure whether your home is suitable, or you want to see what a system would actually cost and save for a house like yours, getting a few properly itemised quotes from MCS-certified local installers is the sensible first step — it costs nothing and commits you to nothing. Use our free quote form to get connected with vetted installers in your area, with no obligation and no pushy follow-up.
Frequently asked questions
Are solar panels mandatory on new builds from 2027?
Yes, in virtually all cases in England. From 24 March 2027, the Future Homes Standard requires new homes to install solar PV covering roughly 40% of the ground floor area. Only roofs with substantial, unavoidable overhead shade are exempt — cost and aesthetics are not valid reasons to skip it.
Does the Future Homes Standard force me to retrofit solar on my existing home?
No. The Future Homes Standard only applies to newly built homes. There is no legal obligation for owners of existing properties to add solar panels. What changes is the market context — as new builds arrive solar-equipped as standard, existing homes without panels may become less competitive at resale.
Will not having solar panels hurt my resale value after 2027?
It may, especially as buyer expectations shift and new-build comparisons become the norm. Peer-reviewed research from Swansea University found solar-equipped homes sold for 6.1–7.1% more than comparable properties without panels. The EPC improvement from solar also matters, since buyers can now filter property portals by energy band and some lenders offer better rates for EPC C or above.
Is there any financial reason to install solar before the FHS comes into force?
Yes — the 0% VAT rate on residential solar installations under HMRC VAT Notice 708/6 is due to expire on 31 March 2027, the same week the mandate starts. After that date, the rate is expected to revert to 5%. On a typical installation costing £8,000–£12,000, acting before the deadline could save you a meaningful sum compared to waiting.
Does the Future Homes Standard apply in Scotland and Wales?
No — the Future Homes Standard is an England-only instrument. Building regulations are devolved, so Scotland operates under Scottish Building Standards and Wales under its own framework. Both have their own trajectories toward low-carbon new homes, but on different timetables and with different specific rules.