Verified answer: GOV.UK states that Approved Document B recommends smoke alarms in new dwellinghouses to at least Grade D2, Category LD3 under BS 5839-6, while separate rental regulations place alarm duties on landlords.
What does the official source say?
- Approved Document B guidance for England recommends smoke alarms in new dwellinghouses in accordance with BS 5839-6 to at least Grade D2, Category LD3.
- The Smoke and Carbon Monoxide Alarm regulations create separate duties for relevant rented accommodation.
- The applicable requirement depends on the nation within the UK, building use, project type and the rules adopted for that property.
What does this mean for smoke alarm selection in United Kingdom?
Do not specify a device for a UK project from a generic “UK compliant” claim. Confirm whether the project is in England, Scotland, Wales or Northern Ireland, then verify the required alarm grade, category, power arrangement, interconnection and evidence accepted by the responsible authority.
What should a buyer verify before ordering?
- The exact destination jurisdiction, building type and adopted code or regulation.
- The model number, detection technology, power source, battery life, audible output and interconnection behaviour.
- The complete certificate and test-report scope, including product variant, issuing body, edition and validity.
- Required marking, instructions, language, traceability, installation and maintenance information.
- Written confirmation from the responsible authority, approved professional, importer or certification body where required.
Primary source
Publisher: GOV.UK
Source status: Approved Document B FAQ updated 21 February 2025; checked 26 October 2026
Official page: https://www.gov.uk/guidance/approved-document-b-fire-safety-frequently-asked-questions
Editorial method: Wanlin Fire paraphrased the official material, separated regulatory facts from product-selection guidance, and linked the original source for verification. Last editorial review: 26 October 2026.