Standard 2.15 applies to a “shared multi-occupancy residential building” — one where more than six people live as their main home and share kitchens or bathrooms. It applies when work needs a building warrant: a new build, a conversion to shared accommodation, or a change of use.
Building standards alone don’t make an existing HMO retrofit, though your licensing authority may ask for it — and a certified system strengthens your licence’s fire safety case either way. We confirm which applies at survey, and every HMO system we design is built to BS 8458 and documented so building control and your licensing officer both get what they need to see.