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RDSAP10 effect on existing heat pump EPC rating?

 
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Government Schemes, Regulations, Training, Planning & Organisations
Last Post by Toodles 2 months ago
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Toodles
 Toodles
(@toodles)
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Joined: 3 years ago
Posts: 2378
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
(@tim441)
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Joined: 3 years ago
Posts: 369
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 2 months 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
 Toodles
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Posts: 2378
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
(@toodles)
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Joined: 3 years ago
Posts: 2378
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
 Toodles
(@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)

IMG 1377

 


This post was modified 2 months ago by Toodles

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


   
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 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
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.


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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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2824
06/11/2025 11:08 am  

What does the SAP/EPC scoring method have to say about the orientation of the solar panels?

Does it still count as 2kW if the developer has placed the six panels on a section of the roof facing north-east? 🤔 

PV Bovis

Save energy... recycle electrons!


   
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Toodles
 Toodles
(@toodles)
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Posts: 2378
06/11/2025 11:36 am  

@transparent Nothing on the south west side??? Toodles.


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


   
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Toodles
 Toodles
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Posts: 2378
06/11/2025 11:40 am  

And further more, why so few panels fitted as there is obviously space for far more? If one has gone to the effort to fit a system, I would nave thought making the most of the space would be advisable. Rewards, Toodles.


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


   
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Transparent
 Transparent
(@transparent)
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Posts: 2824
06/11/2025 11:48 am  

The house is T-shaped @toodles.

The SW side has another part of the roof at right-angles to what's visible in the photo.

PVpanelPlan

I would've put PV on that section facing SE, because it's still plenty large enough to have the six panels fitted to it.
But let's not get carried away and suggest that a national housing developer could use common sense!

 


Save energy... recycle electrons!


   
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2378
06/11/2025 12:00 pm  

@transparent Along with the right workers, they can’t buy any common sense.☹️ Toodles.


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


   
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