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RDSAP10 effect on existing heat pump EPC rating?

AF1 · 2025-06-12T12:03:41Z

Hi. RDSAP10 coming into force on 15th June 2025. Will EPC rating improve substantially for Heat Pump properties?? Maybe get from D to C?

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Toodles

(@toodles)

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26/10/2025 3:53 pm

@af1 Despite the drawings for our extension showing that insulation was to be placed between flat roof and the ceiling, because the EPC assessor could / would not investigate if there was indeed the stated insulation in the cavity, he just marked it as ‘N/A’ and ‘Poor’. Maybe the fee paid to the assessor is not felt to be adequate but they seem unwilling to spend any time on such investigative work to ascertain the truth. Regards, Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Tim441

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26/10/2025 4:25 pm

Afaik different Assessors tske a different level of interest and attitude to use of evidence.

I believe they are obliged to accept:

Building Control Certs
Fensa Certs (windows/doors)
MCS Certs (pv solar, ashp)

Evidence based on photos, material receipts, installer receipts etc is highly variable. Best clarify before appointment of assessor?

The problem will only get worse as property changes hands or comes up for recertification. How will a second or third owner prove previous works? If proven once should that be stored against the property for future?

Somehow the regs & guidance are going to need to take a common line - almost certainly involving a higher cost

This post was modified 3 hours ago by Tim441

Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV

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Toodles

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26/10/2025 4:36 pm

@tim441 In my own case, I knew the insulation filled the roof void as I had had a new plasterboard ceiling fitted a while before - the drawings were from the pack handed to me by the previous house owners. My word nor the drawings were accepted as ‘proof’ though. Regards, Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Toodles

(@toodles)

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26/10/2025 4:42 pm

Having carried out extensive work to further insulate the property with triple glazing replacing the old double, fitting solar panels and energy storage plus a solar power supplied DHW and an ASHP, I have almost been tempted to have a new assessment carried out - chances are though that the ‘score’ might have dropped! 😉 Regards, Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Toodles

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26/10/2025 5:04 pm

The guidance I was given suggested a regime that I consider fitting solar heated DHW and some solar panels; I have more than ‘leveraged’ my setup as I have added far more (8.1 kWp. of solar panels plus battery storage too as well as a Sunamp Thermino for the DHW) Then there is the heat pump - oh wait a minute … that probably means I have knocked the figure back and my ‘C’ has become a ‘D’ rather than a ‘B’!😉 Regards, Toodles. (Extract of improvement advice attached)

This post was modified 2 hours ago by Toodles

Toodles, heats his home with cold draughts and cooks food with magnets.

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Tim441

(@tim441)

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26/10/2025 5:52 pm

@toodles indeed.

the question of proof will only get harder and more inconsistent.

It will need addressing. Later owners will have less knowledge - let alone evidence.

As mentioned much earlier it's a reason I'm focused on getting an updated EPC even though existing has not expired. Working with an assessor who is open to going through it all and agreeing evidence.

It's conceivable a future regime is an improvement. But amost certainly will then be increased cost.