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The HEMline blogger
The Home Energy Model (HEM) is a new way of measuring the energy performance and predicted running costs of dwellings in the United Kingdom.
Once HEM is officially launched by the UK Government, the HEMline Blogger will offer hints and tips to explain what it is and how to use it. You'll find posts to help assessors of all levels from novice experimenters to seasoned, accredited assessors.

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FHS Launch - Impact on EPCs
With the Future Homes Standard set to go live across England next March, housebuilders will need to design in PV panels and install heat pumps to the vast majority of new buildings.
That’s going to have a positive impact on Energy Performance Certificates... for now.

Jon Ponting
Apr 92 min read


EPC Reform postponed until 2027
Last week, the UK Government (representing England and Wales), and the Scottish Government both released statements saying EPCs will remain unchanged until late 2027.
To recap, the way Energy Performance Certificates look, how results are graded, and the way they are calculated, are all changing. When it happens, it will be the biggest refresh to EPCs since their creation in 2008.

Jon Ponting
Mar 232 min read


Scotland Heat In Buildings Bill
Property owners in Scotland need to start planning for how to renovate homes they both rent out, AND live in.
Proposals and timeframes for MEES differ from England and Wales, but the key objectives remain the same – to reduce energy use and carbon emissions generated by our homes.

Jon Ponting
Feb 232 min read


New EPC Targets for Social Housing
The new Minimum Energy Efficiency Standards (MEES) for social housing in England will go live from April 2030.
Landlords must ensure all homes comply by this deadline.
If a property scores A-C using a current EPC, that's OK.
If a property scores A-C under the fabric metric of the new EPC (available from the end of 2026), that's OK.
For properties with a D, E, F or G rating, the landlord will need to make improvements to the energy performance.

Jon Ponting
Feb 42 min read


2030 Changes to Minimum Energy Efficiency Standards
The new Minimum Energy Efficiency Standards (MEES) go live from October 2030.
Landlords must ensure all rentals comply by this deadline.
If a property scores A-C using a current EPC, that's OK.
If a property scores A-C under the fabric metric of the new EPC (available from the end of 2026), that's OK.
For properties with a D, E, F or G rating, the landlord must spend up to £10,000 making fabric and service improvements outlined in the EPC recommendations.

Jon Ponting
Jan 302 min read


EPC Reform: The End of rdSAP10 (Yes, already!)
The UK Government has set out plans to replace rdSAP10 assessments with the Home Energy Model.
Domestic Energy Assessors (DEA) are still getting to grips with rdSAP10 (which was only implemented back in the summer) following years of delays.
This consultation also considers how the new EPC metrics will be defined. You’ve got until March 18th, 2026 to have your say.

Jon Ponting
Jan 282 min read


EPC Reform: England and Wales
EPC certificates in England and Wales will be changing from October 2026. There will still be an A-G rating. But the single rating is being replaced with a dashboard of information, primarily focusing on fabric performance.

Jon Ponting
Jan 263 min read


Scotland EPC Reform Confirmed - What will new EPCs look like?
EPC certificates in Scotland will be changing from October 2026. There will still be an A-G rating. But to spice things up, we’ll get three of them, each considering different factors. The main metric will be a measurement of Fabric Performance. The better your house is at keeping the heat in, the better rating it will achieve. The Heat Retention Rating (HRR) is expected to award A ratings to the most insulated homes in Scotland (<30 kWh/m2 of heat loss), and B ratings <90.

Jon Ponting
Oct 27, 20252 min read


Scotland EPC Reform Confirmed - What & When
The Scottish Government has published what EPC Reform is going to look like. SAP assessors are advised to strap in… it could be a bumpy ride! Every EPC in Scotland will need to be redone, using a more complicated assessment tool that isn’t ready yet, with a nation of re-trained SAP assessors attending training courses that haven’t been written yet, signing up to 'new enhanced accreditation scheme requirements' that don’t exist yet.

Jon Ponting
Oct 20, 20252 min read


EPC accuracy in the spotlight (again)
It was good to see Elmhurst's Stuart Fairlie in this article, raising the issue of outdated methodology that currently drives our EPC ratings.
It's after a chap installed a heat pump and PV in his house, and was given a worse Energy Performance Certificate for his troubles.

Jon Ponting
Sep 22, 20251 min read


Proposal for new look EPCs in Scotland
This consultation gives details for what the new EPC metrics may prioritise when assessors switch to the Home Energy Model. Fabric performance is likely to become the primary metric. It's highly possible that the whole of the UK will adopt a similar strategy in the coming years.

Jon Ponting
Jul 14, 20252 min read


EPC reform needed to help UK's retrofit market
House of Commons committee gives blunt but honest review of the current EPC process, and calls for reform to improve the accuracy of the information on the energy certificates.

Jon Ponting
Jun 2, 20252 min read


rdSAP10 set to arrive in June 2025
Domestic Energy Assessors are expected to switch to rdSAP10 from June 2025. This will improve the accuracy of EPC assessments.

Jon Ponting
Apr 7, 20252 min read


EPC Reform - Consultation closed
A summary of what is proposed in the UK Government's EPC Reform consultation.

Jon Ponting
Mar 3, 20254 min read


Private Renters EPC Consultation - Landlord Exemptions
The 2025 PRS MEES consultation suggests increasing the minimum energy performance of privately owned dwellings, and increasing the amount of

Jon Ponting
Feb 24, 20252 min read


Private Renters EPC Consultation - Impact on Assessors
The 2025 PRS MEES consultation suggests using new-style EPCs to judge whether a privately rented home will need upgrading for better energy

Jon Ponting
Feb 17, 20252 min read


Private Renters EPC Targets - Consultation
The 2025 PRS MEES consultation suggests increasing the minimum energy efficiency standards of privately rented homes, forcing landlords to i

Jon Ponting
Feb 10, 20252 min read
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