Reviewed 7 October 2026 · England · Regulation update
The government published Building Circular 01/2026 on 24 March 2026. Before agreeing a project specification, ask building control which requirements and transitional arrangements apply to your work.
What to check
- Whether the project is a new dwelling, an extension or work to an existing building.
- Which Approved Documents apply to its energy efficiency and ventilation.
- Whether application and commencement dates affect transitional arrangements.
- What evidence building control needs before work begins.
Publication and commencement are different dates. Do not assume that every new standard already applies to every renovation.
Official source: GOV.UK Building Circular 01/2026. Confirm project-specific requirements with your building control provider.