Change of Use Planning Permission Explained

General guidance for property owners and landlords in England. Last reviewed: 12 September 2026

General information, not a decision on any specific property. Confirm your position with your local planning authority before starting work. See our AI Disclaimer.

What counts as a "change of use"

Planning law groups property uses into categories (use classes) — for example, different classes cover residential dwellings, houses in multiple occupation, and various commercial and business uses. Moving a property from one use class to a genuinely different one is generally a "material change of use" and normally requires planning permission, even where no building work takes place at all.

Common change-of-use scenarios

• House to flats — converting a single dwelling into self-contained flats is a material change of use requiring planning permission, on top of Building Regulations for fire separation, sound insulation and means of escape between units.
• House to HMO — a small HMO (typically up to six unrelated occupants sharing facilities) can in some areas fall under permitted development, but many local authorities have removed this right via an Article 4 direction covering some or all of their district. A separate HMO licence from the council may also be required, independent of planning.
• Commercial to residential — some office-to-residential and other commercial-to-residential changes are allowed under a specific permitted development route, but this operates through a prior approval process (the council assesses specific matters such as flooding, contamination and noise) rather than being automatic, and some building types and locations are excluded entirely.
• Change within a single use class — moving between uses that fall within the same use class does not normally need planning permission, since it is not treated as a material change at all.

Building Regulations are a separate question

Even where a change of use doesn't need planning permission (or already has it), Building Regulations still apply to any physical works involved — and changing a building's use can itself trigger Building Regulations requirements (for example around fire safety and access) even without structural alteration.

What this means in practice

Change of use rules depend on the specific existing and proposed use classes involved, local Article 4 directions, and (for some routes) a formal prior approval process with its own assessment criteria — general categories aren't enough to determine the position for a specific property.

See also: HMO planning permission, Permitted development rights explained and Do you need a party wall agreement?