Last reviewed: 2 April 2026 against the Ofgem BUS scheme page and the March 2026 draft installer guidance v5.
Short answer
For retrofit BUS applications, the draft Ofgem guidance says a valid EPC is no longer required for applications properly made on or after 28 April 2026.
What that does not mean
- It does not mean surveys can be lighter.
- It does not mean heat loss assumptions no longer matter.
- It does not mean the accredited installer carries less responsibility for the application.
What to check instead
| Question | Practical check |
|---|---|
| Is there still a valid EPC? | If yes, keep the reference clearly. If not, do not assume the property background is already covered elsewhere. |
| Can the survey stand on its own? | Fabric, glazing, heating, electrics, and room data should be clear enough for the office and designer to use without leaning on an EPC. |
| Does the customer have useful supporting paperwork? | Expired EPCs, utility bills, and previous records can still help background understanding even when they are not a formal requirement. |
Bottom line
The EPC rule is becoming lighter at application stage. The survey and installer judgement still carry the practical workload.
Sources
For the fuller picture, read the main BUS changes guide.