The Welsh Government published the summary of responses to its Building Regulations Part L 2025 review on 27 February 2026, the page's last updated date1. The consultation ran from 26 August 2025 to 17 November 2025 and has ended1.
The review covers the conservation of fuel and power under Part L, and the consultation also set out changes to Part F (Ventilation) and Part O (Overheating) of the Building Regulations, plus associated Approved Document guidance1. The Welsh Government described the purpose of the exercise in these terms:
"We want your views on our plans to improve energy efficiency standards in new and existing homes and buildings."
The published outcome is a summary of responses, a PDF of 1 MB1. The consultation documents issued in August 2025 remain listed alongside it: the consultation document (1 MB), Approved Document F consultation version (2 MB), Approved Document L volume 1 (2 MB), Approved Document L volume 2 (2 MB), Approved Document O (613 KB) and a consultation stage impact assessment (544 KB)1. The summary of responses document itself has not been described in the published page beyond its title and file details, and no decisions following the consultation have been reported there1.
| Item | Detail |
|---|---|
| Consultation opened | 26 August 20251 |
| Consultation closed | 17 November 20251 |
| Summary of responses published | 27 February 20261 |
| Parts in scope | Part L, Part F, Part O and associated Approved Documents1 |
Why it matters for households
Part L sets the conservation of fuel and power requirements that new and existing homes in Wales are built and renovated to, so any change to it shapes how much energy a dwelling is expected to use for heating, hot water and lighting. Because the review also takes in Part F ventilation and Part O overheating, it touches the three things that most affect how a home performs in practice: how well it holds heat, how it is ventilated, and how it avoids overheating in warmer weather. For a household, the practical effect of standards set here is felt through the fabric and services of the building rather than through bills directly, and through what is required when work is done. The Welsh rules differ from those in England, so the detail of what applies depends on where a home is. The summary of responses is the point at which the responses received are set out; it is not itself a statement of what will change1.
What happens next
No next steps have been reported on the published page beyond the summary of responses itself1. The page lists a related integrated impact assessment for the review of Part L (2025)1. Enquiries about the consultation are directed to the Welsh Government Building Regulations team1.