Forums

Forums
Sustainable Sidetra...
Government Schemes,...
RDSAP10 effect on e...
 
Notifications
Clear all

RDSAP10 effect on existing heat pump EPC rating?

 
Government Schemes, Regulations, Planning & Organisations
Last Post by Aaron 20 minutes ago
10 Posts
3 Users
1 Reactions
59 Views
RSS
 AF1
(@af1)
Active Member Member
Joined: 2 years ago
Posts: 9
Topic starter 12/06/2025 1:03 pm  

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

This topic was modified 24 hours ago by AF1

   
Quote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 4 years ago
Posts: 3268
12/06/2025 1:41 pm  

Good point... this slipped off my radar, and I've not really heard much about what to expect. 

Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
ReplyQuote
 Aaron
(@aaron)
Active Member Member
Joined: 4 months ago
Posts: 8
12/06/2025 4:57 pm  

Posted by: @af1
↑

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

 

RdSAP 10 represents a significant shift in how EPCs are calculated, particularly for properties with heat pumps. The revised methodology places greater emphasis on carbon emissions and gives more accurate credit to low-carbon technologies, smart heating controls, and integrated systems such as solar PV and battery storage. In theory, this should result in a notable uplift in EPC ratings for well-insulated homes with documented installations—potentially moving them from a D to a C rating. However, the practical reality is more complex. The accuracy of any EPC assessment under RdSAP 10 is heavily dependent on the quality of data input, which in turn relies on the availability of supporting evidence like installation certificates, specification sheets, and test results. Unfortunately, there is a persistent issue in the industry: many clients are reluctant to cover the cost of the additional time required for a comprehensive survey. As a result, assessors—working within limited budgets and tight timeframes—are often forced to rely on default values, which can significantly understate the true performance of the property. So while RdSAP 10 brings the potential for more accurate and favourable ratings, without proper engagement and investment from clients, much of that benefit risks being lost in practice.

 


   
ReplyQuote



 AF1
(@af1)
Active Member Member
Joined: 2 years ago
Posts: 9
Topic starter 12/06/2025 6:48 pm  

@aaron Great response, thank you. Yes I already knew that Proof of all aspects is the key. I have everything regarding Glazing, GSHP, MVHR, EWI except the cavity fill certificate so I have emailed CIGA.  I had paid £300 for an SPF report for RHI.


   
ReplyQuote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 4 years ago
Posts: 3268
12/06/2025 9:42 pm  

On the lighter side, in this brilliant spoof, the legendary Ken Bone plays both the homeowner and the EPC inspector, capturing the absurd reality many UK homeowners face when renewables clash with outdated energy assessments. From heat pumps being ignored to solar panels dismissed as “ugly,” this tongue-in-cheek sketch shines a spotlight on how EPCs often miss the mark.

This post was modified 15 hours ago by Mars

Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
ReplyQuote
 Aaron
(@aaron)
Active Member Member
Joined: 4 months ago
Posts: 8
12/06/2025 10:43 pm  

@editor  very good!! Im surprised he got the assessor into the property..

 

This is exactly why we don’t use RdSAP—it’s designed for speed and simplicity, not accuracy. We carry out all our assessments using full SAP software. It takes more time and effort, and yes, it does cost more—but the results are significantly more accurate and reflective of the building’s actual performance. When you're making decisions that affect long-term energy use and compliance, it's worth doing it properly.


   
👍
1
ReplyQuote
 AF1
(@af1)
Active Member Member
Joined: 2 years ago
Posts: 9
Topic starter 13/06/2025 8:08 am  

@aaron What is the cost of a full SAP and will it bring the rating up in a property with GSHP, MVHR, DG, Full loft insu and 100mm Phenolic EWI?


   
ReplyQuote
 Aaron
(@aaron)
Active Member Member
Joined: 4 months ago
Posts: 8
13/06/2025 8:42 am  

@af1 prices will vary depending on size and complexity of the building.  Starting at around £300


   
ReplyQuote
 AF1
(@af1)
Active Member Member
Joined: 2 years ago
Posts: 9
Topic starter 13/06/2025 8:59 am  

@aaron will it bring the rating up in a property with GSHP, MVHR, DG, Full loft insu and 100mm Phenolic EWI?


   
ReplyQuote



 Aaron
(@aaron)
Active Member Member
Joined: 4 months ago
Posts: 8
13/06/2025 12:18 pm  

@af1 if all of those features (GSHP, MVHR, double glazing, full loft insulation, and 100mm phenolic EWI) weren’t in place at the time of the last EPC, then yeah, you should see a significant jump in the rating when it’s reassessed.


   
ReplyQuote
Forum Jump:
  Previous Topic

Currently viewing this topic 2 users ( AF1, Aaron ) .

Recently viewed by users: Morgan 31 minutes ago, Richard24738 44 minutes ago, Mars 54 minutes ago, JamesPa 15 minutes ago.

Share:

Join Us!

Trusted Installers

Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.

✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available

👉 Find your installer now!

Latest Posts