Four policies, one gap
Britain's plans to clean up its buildings have all slipped. Here is what that costs.
Britain has halved its greenhouse gas emissions since 1990. They fell again in 2025, by 1.8%, to 407 million tonnes. Almost all of that long run progress came from one place: changing how we make electricity. Coal has gone, wind and solar have grown, and that job is largely done.
The next stage is harder, because it happens inside people's homes and workplaces. It is also where Britain has fallen furthest behind. When the Climate Change Committee, the government's independent adviser, reported to Parliament in June 2026, its message was that the country needs to almost double the speed at which it cuts emissions, and that the biggest single gap now sits in buildings.
Four government policies are meant to close that gap. They aim at four different groups: the firms that build new houses, the people who rent property out, households who cannot afford to upgrade, and, in one case, nobody at all. Every one of them has been delayed. Because they lean on each other, those delays do not simply add up. They multiply.
What actually needs fixing
Emissions from buildings did fall a little in 2025, by 1.9 million tonnes, or 2.4% once you allow for how cold the winter was. But the Committee's reading is that this happened because heating got expensive after a second global energy price shock in four years, so people used less of it. Nothing structural changed. That is not a saving you can count on repeating.
Heat pumps show the same picture. A heat pump is an electric heating system that moves warmth into a house rather than burning fuel to create it, which is why it can deliver several units of heat for every unit of electricity it uses. Around 52,000 went into existing homes in 2025. The government wants 450,000 a year by 2030. Fewer than two homes in every hundred have one. And there are fewer than 30,000 qualified heat pump installers in the country, against more than 130,000 gas engineers.
Britain has a legal commitment to cut emissions by a set amount by 2030. The Committee's assessment is that the country is 64 million tonnes short, and that only 44% of the cuts needed are covered by plans it considers credible. Most of the credible part comes from renewable electricity and electric cars. Buildings is where much of the rest was supposed to come from.
1. The Future Homes Standard, aimed at housebuilders
This is the rulebook for how new homes in England are built, and specifically how much energy they are allowed to use. After seven years of consultation, the final version was published on 24 March 2026.
It is a strong standard. New homes must produce at least 75% less carbon than homes built to the rules that have applied since 2013. That is a level a gas boiler simply cannot reach, so in practice every new home will need a heat pump. Solar panels are required across at least 40% of the ground floor area. Some old exemptions that had allowed a handful of plots to be built to even older standards were scrapped.
The problem is when it starts. The rules do not take effect until 24 March 2027, and there is then a further year of transition, so they do not fully apply until March 2028. Projects already in the planning system can carry on under the old standard if they are started before that date.
Industry estimates suggest at least 110,000 extra homes will be built with gas boilers in that gap. Every one of them will need converting before 2050, at far greater cost and disruption than fitting the right system during construction. There is also an incentive to get foundations into the ground before the deadline, which could push the number higher.
2. Minimum Energy Efficiency Standards, aimed at landlords
Every property that is sold or rented needs an Energy Performance Certificate, which gives it a rating from A down to G. Minimum Energy Efficiency Standards, usually shortened to MEES, are the rules that say a property cannot legally be let if its rating is too low. At the moment the floor is band E.
For rented homes, the government confirmed in January 2026 that the floor rises to band C by 1 October 2030. Roughly three million privately rented homes currently sit below that. Social landlords face a similar deadline of 1 April 2030.
For shops, offices and other commercial premises, the plan was watered down considerably on 18 June 2026. The new requirement is band B by 2031, but only for buildings larger than 1,000 square metres, and only where it is cost effective to do the work. An earlier commitment to band C by 2027 was dropped altogether, and smaller premises stay at band E with no new deadline announced. A longstanding rule also survives whereby landlords only have to spend what the energy savings would recover over seven years.
The original plan, consulted on back in 2021, covered the whole commercial rented sector: band C by 2027, then band B by 2030. What replaced it is narrower, later and applies to fewer buildings. The government estimates tenants in those larger buildings will save £360 million a year by 2031, which is real money, but a fraction of what full coverage would have delivered.
3. The Warm Homes Plan, aimed at households
Published on 21 January 2026, this is the money. The plan aims to upgrade up to five million homes and lift as many as a million families out of fuel poverty by 2030, with a new Warm Homes Agency pulling delivery together.
There are three main routes:
The Warm Homes Local Grant covers insulation, heat pumps, solar panels and batteries in full for lower income households, delivered through local councils.
The Boiler Upgrade Scheme gives any homeowner in England or Wales £7,500 towards a heat pump, with no means testing. From 21 July 2026 that rises to £9,000 for homes off the gas grid that currently burn oil or LPG. Since April 2026 you no longer need insulation work recommended on your certificate before you can apply.
A loan scheme offering low or zero interest finance for solar panels, batteries and heat pumps starts phasing in from 2027.
One caution on the headline figure: published coverage cites both £13.2 billion and £15 billion, depending on whether a wider package is included. Check the government's own figure before quoting either.
The bigger change is where the money comes from. Since 2013, home upgrades have largely been funded by an obligation on energy suppliers, whose costs then landed on everyone's bills. That model is ending. The Great British Insulation Scheme closed on 31 March 2026, the ECO4 scheme finishes on 31 December 2026, and there is no successor. Funding now comes from general taxation instead, which is arguably fairer, but it means delivery depends on council capacity and Treasury budgets rather than an automatic duty on suppliers.
One piece is missing entirely. The scheme that paid for upgrades to schools, hospitals and council buildings has closed with nothing to replace it, removing close to five million tonnes of expected savings. That is one of the largest single holes anywhere in the government's climate plan.
4. The Home Energy Model, aimed at nobody
Every rating, every deadline and every grant in the three policies above depends on a calculation: how much energy does this building actually use? Since 1993 that sum has been done using a method called SAP. The Home Energy Model replaces it.
It is a genuine improvement. SAP works month by month. The new model works out energy use every half hour across the year, which is the only way to represent heat pumps, batteries, solar panels and smart controls honestly. It also changes what a certificate looks like, replacing the single letter with four separate scores: how well the building holds heat, how clean its heating system is, how well it makes use of solar and storage, and what it actually costs to run.
It has been delayed twice in two months. In February 2026 the government decoupled it from the Future Homes Standard, so the old SAP method stays in use for new builds at first. In March it pushed the new style certificates from October 2026 to the second half of 2027, with old and new running side by side until around 2029. The stated reason was making sure the model works properly before it goes live, which is a reasonable call in itself.
This is nonetheless the most consequential of the four delays, for one reason. Under the new method, a home heated by gas or oil cannot reach band C, no matter how well insulated it is. So landlords have a legal deadline of October 2030, measured by an instrument that will not exist until late 2027, under which properties that pass comfortably today may fail. Meanwhile a certificate issued under the current method before October 2029 stays valid for ten years. The rational move for a landlord is therefore to get assessed early, under the very rules the reform is meant to retire.
Why the delays multiply
Individually each slip looks survivable. Together they interlock.
Pushing the new measuring method to late 2027 leaves landlords under three years to hit a fixed 2030 deadline instead of four or five. That squeezes demand for assessors, insulation and heat pump fitters into a shorter window, in a trade already short of roughly 100,000 installers compared with the gas workforce. At the same time, the new build standard pulls solar panels and heat pumps toward housebuilders, and the Warm Homes Plan pulls the same trades toward funded retrofit. The old supplier funded schemes finish in December, so the market has to absorb that capacity in between.
This is the same pattern visible elsewhere in British infrastructure policy, in water regulation and in grid connections. The destination gets written into law. The machinery for getting there arrives late. The gap is absorbed by supply chains and by households rather than by policy.
What it means for the national targets
Parliament approved the Seventh Carbon Budget on 24 June 2026, capping emissions at 535 million tonnes across the years 2038 to 2042, roughly 87% below 1990 levels. Electrification is expected to do about 60% of the work to 2040. On heat pumps alone, that implies running at something like nine times the current rate, sustained, beginning now rather than in 2028.
None of these four policies is badly designed. The new build standard is genuinely ambitious. The new calculation method is far better than the one it replaces. MEES gives landlords a real and enforceable date. The Warm Homes Plan is the largest funded upgrade programme of the decade. The difficulty is timing and order: an ambitious 2030 target, measured by a ruler that turns up in 2027, enforced on a workforce that does not yet exist, in a market whose funding changes in December.
What to watch next
The government's outstanding response on how the new certificates will be assessed, expected later in 2026
Whether the second half of 2027 date for the new model holds, or slips a third time
The secondary legislation for commercial premises, without which band B by 2031 does not actually bind anyone
How cleanly the new grants absorb demand when ECO4 closes on 31 December
Any replacement for the public sector upgrade scheme
Whether housebuilders rush to lay foundations before the March 2028 cut off
Sources
Climate Change Committee, Progress in reducing emissions: 2026 report to Parliament, 24 June 2026
Ministry of Housing, Communities and Local Government, Approved Documents L and F and Building Circular 01/2026, 24 March 2026
Department for Energy Security and Net Zero, Minimum Energy Efficiency Standards in the non domestic Private Rented Sector: interim response, updated 18 June 2026
Department for Energy Security and Net Zero, Warm Homes Plan, 21 January 2026
GOV.UK, Standard Assessment Procedure guidance, update of 10 February 2026
Home Energy Model EPC assessment consultation, 21 January 2026, closed 18 March 2026
Hansard, Carbon Budget Order debates, June 2026