Change of https://www.gov.uk/government/consultations/home-energy-model-replacement-for-the-standard-assessment-procedure-sap

Change description : 2025-10-02 12:00:00: Summary of responses and government response published. [Policy papers and consultations]

Showing diff : 2024-03-01 17:46:22.825901635 +00:00..2025-10-02 11:01:06.505924782 +00:00

OpenConsultation consultationoutcome

Home Energy Model: replacement for the Standard Assessment Procedure (SAP)

From:
Department for Energy Security and Net Zero
Published
13 December 2023
Last updated
12 MarchOctober 20242025 — See all updates
This consultation has concluded

Read the full outcome

Summary

The Home Energy Model: summary of responses received and government response

PDF, 386 KB, 47 pages

The Home Energy Model: summary of responses received and government response (accessible webpage)

HTML

Detail of outcome

The government is committed to refining the Home Energy Model (HEM) to support net zero and housing goals. HEM will go live alongside reforms to the Future Homes Standard (FHS), providing a new methodology for demonstrating compliance.

To ensure a smooth transition, both HEM and a version of SAP (the Standard Assessment Procedure, currently used to assess the energy performance of homes) will be available for a limited period. This dual running allows industry and stakeholders time to adapt, ensures continuity, and enables further validation of the new model before it becomes the sole methodology. 

In 2025, we will explore integrating HEM into Energy Performance Certificates (EPCs), aiming to improve clarity and usefulness for households and industry. 

The HEM engine will continue to be developed via the Energy Calculation as a Service (ECaaS) platform, delivering a fast, cloud-based tool available by autumn 2025 to support regulation and third-party applications. Updated technical documentation and validation reports will accompany the next release, highlighting improvements and expanded real-world testing.

Detail of feedback received

We received 120 responses to this consultation, from:

  • organisations
  • trade bodies
  • industry professionals
  • academics
  • members of the public

While not every individual point is addressed here, all feedback has been carefully analysed and has shaped our approach.

Original consultation

Summary

We're seeking views on the new Home Energy Model which will replace the Standard Assessment Procedure (SAP) for the energy rating of homes.

This consultation closesran atfrom
to

Consultation description

Update: 1 March 2024

We have extended the consultation closing date to 27 March 2024 (from 6 March).

The Standard Assessment Procedure (SAP) is the methodology currently used by the government to estimate the energy performance of homes across the United Kingdom. It is of critical importance to the delivery of our housing and climate change objectives.

The Home Energy Model will replace the SAP for the energy rating of dwellings. It is still under development and we will implement the first version alongside the Future Homes Standard in 2025.

We are consulting on the Model while it is still at a formative stage, so that industry can participate in the development process. This consultation:

  • summarises the development and validation work undertaken to date
  • invites feedback to enable further model development in advance of its introduction

We will also hold a series of engagement events throughout the consultation period: email homeenergymodel@energysecurity.gov.uk to find out more.

The consultation will be of interest across the built environment sector.

It is part of a wider government package of material relating to the Home Energy Model and the Future Homes Standard:

Technical documents:

Read our consultation privacy notice.

Documents

The Home Energy Model: making the Standard Assessment Procedure fit for a net zero future

PDF, 1.07 MB, 83 pages

The Home Energy Model: making the Standard Assessment Procedure fit for a net zero (accessible webpage)

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An evaluation of the Home Energy Model and Future Homes Standard assessment wrapper

PDF, 329 KB, 12 pages

Ways

An toevaluation respond

Respondof online

or

Emailthe to:

homeenergymodel@energysecurity.gov.ukHome Energy Model and Future Homes Standard assessment wrapper (accessible webpage)

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Updates to this page

Published 13 December 2023
Last updated 12 MarchOctober 2024 + show2025 href="#full-history">+ show all updates

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Update history

2025-10-02 12:00
Summary of responses and government response published.

2024-03-01 17:46
Consultation closing date extended to 27 March 2024.

2023-12-13 11:20
First published.