The Future Homes Standard was laid on 24 March 2026 and takes legal effect a year later, on 24 March 2027. From that date, almost every new home built in England needs a roof-mounted solar PV array sized to roughly 40% of the building's ground floor footprint, hitting a minimum output density of about 0.22 kWp per m² — which in practice means broadly south-facing panels, pitched 30–45 degrees, without significant overshading. Developers who genuinely can't meet that on a given plot can argue an alternative approach to building control, but the default assumption is now: every new house gets solar. Higher-risk buildings above 18 metres get a later compliance date (September 2027) and are exempt from the solar clause specifically.
That's a real overnight shift. Solar has spent the last fifteen years as an optional extra — something a developer bolted on to hit a marketing headline, or a self-builder chose because they cared. From spring 2027 it's simply what a new home is, in the same bracket as double glazing or a damp-proof course. So: does a compliant new home still sell for more because it has solar? Or does the premium quietly evaporate the moment it stops being a choice?
1. The premium doesn't disappear — it relocates
The instinct that "if everyone has it, nobody pays extra for it" is basically correct, but it's answering the wrong question. The premium was never really attached to the panels. It was attached to the gap between homes that had solar and homes that didn't. Mandate solar for all new build, and that gap doesn't close inside the new-build category — it closes there and reopens somewhere else: between new build and the 29-odd million existing homes that were built before 2027 and never will have solar unless an owner chooses to retrofit it.
There's a reasonably direct precedent for this in the UK's own building regs history. Cavity wall insulation, then double glazing, then EPC-band improvements each went through the same arc: early adopter premium while a feature was rare and optional, followed by a flattening once regulation made it near-universal in new stock — at which point the value gap re-formed as a discount on the old stock that lacked it, rather than a premium on the new stock that had it. Nobody today pays a "double glazing premium" for a 2015-built house over another 2015-built house, because they're both double glazed. But there's a very real, well-documented value and mortgageability penalty on a solid-wall Victorian terrace with single glazing and an EPC of E or F. FHS solar is set up to do exactly the same thing: the premium moves from "new build with solar" vs "new build without" (a comparison that will barely exist after 2027) to "new build" vs "everything built before it."
| Comparison | Likely outcome post-2027 |
|---|---|
| New build with FHS solar vs. another new build with FHS solar | No premium — both compliant, solar is baseline |
| New build (FHS solar, mandatory) vs. new build built just before the cut-off (no solar) | Meaningful, temporary gap — a "regulatory vintage" effect until pre-2027 new stock ages out of comparison |
| New build (FHS) vs. typical existing home, pre-2020s, no solar, EPC D/E | Widening gap — reframed as a running-cost/EPC discount on the older home, not a solar premium on the new one |
| Two new builds, both FHS-compliant, one with a larger array/battery/EV-ready wiring | Small residual premium — differentiation shifts from "has solar" to "how much, and how well integrated" |
The headline "solar premium" doesn't vanish under FHS — it stops being visible within the new-build category and becomes visible again as a gap between new and old stock.
2. Heat pumps got there first — and the pattern already shows
This isn't hypothetical; it's already playing out one step ahead with heat pumps. Government policy is steering new-build low-rise homes toward heat pumps as the default heating choice through the same regulatory push (with fuller effect from 2028), and the market has already absorbed the idea that a new-build heat pump isn't a differentiator against another new build — it's the wallpaper. Buyers comparing two 2026-built three-bed semis don't pay a premium for the one with a heat pump over the one with a heat pump; they're both fine. Where the heat pump narrative still bites hard is the older-stock comparison: a house with a gas boiler and a £2,000-plus retrofit bill hanging over it, competing against new stock that never had a boiler to begin with.
Solar under FHS should track the same curve, probably faster, because unlike a heat pump a solar array is visible from the street and easy for an agent to photograph. The risk isn't that new-build solar becomes worthless as a selling point — it's that agents keep marketing it as if it's still 2024, treating "has solar" as the pitch, when by 2028 every comparable listing on Rightmove will say the same thing and it'll read as noise rather than an advantage.
3. Where the real differentiation goes next
If "has solar" stops working as a differentiator, three things plausibly take its place inside the new-build market:
Array size and orientation quality
The FHS minimum (40% of ground floor area, 0.22 kWp/m²) is a floor, not a ceiling. A developer who fits a larger array, uses higher-efficiency panels, or gets the orientation genuinely right (rather than the bare-minimum south-facing slice needed to pass Part L) can still out-generate a box-ticking neighbour by a wide margin. A north/south split roof with microinverters, for instance, still generates meaningfully less than an equivalent south-facing array — the compliance certificate won't tell a buyer that, but a year of metered data will.
Battery storage and smart export
FHS mandates the panels, not a battery, and not a smart export tariff. A new build with a sized battery and an agile-tariff-ready setup can genuinely undercut a bare-minimum-compliant neighbour on running costs, and that's a premium buyers can still be sold on — because it isn't required by law yet.
Verified, not modelled, running costs
Nearly every number a buyer sees before completion — the EPC, the SAP/HEM calculation, the developer's glossy "save £X a year" leaflet — is a model, not a measurement. Once a first cohort of FHS homes has a year or two of real bills behind them, the differentiator becomes proof: an actual annual electricity spend, an actual generation figure, rather than a compliance-derived estimate. This is exactly the same dynamic behind why a specific, concrete number cuts through in a way a percentage or a rating never does.
The perception gap is real, and it's an agent problem more than a buyer problem
Yes — there's a genuine risk that agents and developers undersell the running-cost story once solar is compulsory, precisely because "it's just a building regulation now" feels like nothing to talk about. Estate agency has always been better at describing rooms than describing bills: a fourth bedroom is easy to photograph and easy to value against comparables, whereas "this house costs £830 less a year to run" requires a conversation most agents aren't trained to have and most buyers don't ask for on a viewing.
The fix isn't a bigger sign in the window saying "solar fitted" — from 2027 that's true of the house next door too, and buyers will correctly discount it as background noise, the same way nobody remarks that a new home has smoke alarms. The fix is swapping a compliance claim for a concrete number: a real annual bill, a real generation total, a real EPC band achieved rather than modelled. A specific figure like a genuinely low combined energy bill does more to move a buyer than any amount of "meets Future Homes Standard" copy, because it's the kind of proof a compliance tick can't fake and a spreadsheet can't argue with.
The bottom line
The premium for "new home has solar" mostly disappears once solar stops being optional — but only because it was never really a premium for the panels themselves. It was a premium for being ahead of a regulatory curve that's now closing. That value doesn't vanish; it reappears as a growing valuation and mortgageability gap between new-build stock and the pre-2027 housing that makes up the vast majority of what's actually for sale in the UK, and — within the new-build category itself — as a smaller, more technical premium for homes that go meaningfully beyond the bare compliance minimum on array size, storage and verified running costs. Agents who keep selling "it's got solar" as the headline will find that line goes flat fast. The ones who start selling the actual number on the bill will be the ones still commanding attention.