This page is about the survey side of the Warm Homes Plan. The short version is simple: more funding and more public interest do not make survey work lighter. They make weak assumptions more expensive.
What the Warm Homes Plan actually says
The Warm Homes Plan was published on 21 January 2026 and updated on 18 March 2026. The headline is £15 billion of public investment, with an ambition to upgrade up to 5 million homes by 2030.
That does not mean every funding route is already a live, settled product. Some parts are concrete now. Some parts are still programme design.
- Confirmed now: the plan exists, the public funding headline exists, and the government is still using live schemes such as the Boiler Upgrade Scheme and Warm Homes: Local Grant.
- Announced but still detail-heavy: wider government-backed loan routes for measures such as heat pumps, solar, and batteries.
- Important on the survey side: none of that removes the need to measure the property properly before anyone prices or installs the job.
The March 2026 Warm Homes: Local Grant statistics add useful delivery detail. DESNZ says £0.5 billion has been allocated to the scheme from April 2025 to March 2028, across 74 projects involving 271 local authorities in England.
Where surveys matter first
Policy headlines create demand. Survey reports decide whether that demand turns into clean jobs or messy callbacks.
- Heat pump jobs: you still need EPC context, heat loss, emitter checks, plant location, and electrical reality.
- Solar and battery jobs: you still need roof condition, shading, array layout, inverter and battery locations, and grid/export assumptions.
- Mixed-system jobs: once a customer is considering heat pump, solar, and battery together, one missing assumption can distort the whole quote.
- Grant or scheme jobs: the more public money involved, the less tolerance there is for vague site notes and missing evidence.
BUS, EPC, and heat pump jobs
The Warm Homes Plan did not replace the Boiler Upgrade Scheme. BUS still sits alongside it as a live scheme. On the practical side, that means installers still need to separate policy headlines from actual live grant rules.
- BUS still needs a valid EPC before a voucher application can proceed.
- A valid EPC is not a design survey. It does not settle emitter suitability, plant location, cylinder space, or electrical constraints.
- MIS 3005 design work still matters. Heat-loss inputs, room-by-room assumptions, and site facts still have to be right.
If the office is pricing from an EPC plus a phone call, it is still exposed. The Warm Homes Plan does not change that.
Planning, sound, and siting still need site facts
The current Planning Portal guidance for England still sets real conditions around siting and permitted development. As of April 2026, that guidance says:
- the installation must comply with MCS 020 or equivalent standards, and from 28 May 2026 MCS 020 will be the only permitted certification scheme
- the outdoor unit must not exceed 1.5 cubic metres on a house or 0.6 cubic metres for a block of flats
- pitched-roof installations are not permitted development
- if the unit is on a flat roof, all parts must be at least one metre from the external edge
That is why site reports still need exact proposed locations, boundary context, neighbour context, mounting arrangement, and good photography. Without that, the planning answer is guesswork dressed up as certainty.
Solar, battery, and combined-system jobs
The Warm Homes Plan leans heavily on the idea that households will combine technologies more often. That makes the survey wider, not smaller.
- Solar: roof structure, usable area, orientation, shading, cable route, inverter location, and likely export setup.
- Battery: mounting space, fire-safe location, ventilation, cable runs, consumer unit position, and whether the system is retrofit-friendly.
- Combined systems: whether the property can actually use the technologies together well, rather than simply fitting them physically.
This matters because the Warm Homes Plan technical annex uses bundled scenarios when it talks about bill savings. Those are modelling assumptions, not a promise that every house will behave the same way.
What a useful survey report should settle
If the policy environment is getting busier, the report has to get cleaner. A useful report should settle the questions the office, designer, and installer would otherwise keep reopening.
- Heat pump: heat loss, emitter route, cylinder position, outdoor unit location, electrical capacity, and any obvious planning or sound flags.
- Solar: roof details, shading, usable array zones, inverter route, and supply-side electrical context.
- Battery: plant location, connection route, isolation and access considerations, and whether the install works cleanly with the rest of the proposed system.
- Evidence: labelled photos, clear notes, measurements that can be checked later, and enough structure that the next person does not have to interpret half-finished survey thinking.
Mistakes to avoid when the policy headlines get ahead of the job
- Treating the press release as if it were a live grant handbook.
- Using the EPC as a substitute for site design work.
- Assuming planning is fine without checking siting, roof type, and boundary context.
- Quoting loans or support routes as if the product detail is already settled.
- Looking at heat pump, solar, or battery jobs in isolation when the customer is clearly moving toward a combined system.
Official reference points
- GOV.UK: Warm Homes Plan
- GOV.UK: Warm Homes Plan technical annex
- GOV.UK: Warm Homes: Local Grant statistics - March 2026
- Ofgem: Boiler Upgrade Scheme
- Planning Portal: air source heat pump planning guidance
What to do next
The Warm Homes Plan is a big policy signal. It is not a shortcut around survey work.
If anything, the stronger the funding story gets, the more important it is that the report can stand on its own: clear measurements, clear photos, clear notes, and no invented certainty where the site still needs checking.