Change of Use Guide

Check planning decisions, approved plans, conditions and evidence of the actual activities. Changes within a use class may not require permission, but conditions and other restrictions can alter the position.

Mixed uses, live-work premises and buildings with more than one planning unit require careful analysis. Do not choose the preferred future use class first and assume the existing building fits the route.

C3 generally covers dwellinghouses. C4 covers small houses in multiple occupation for between three and six residents living as more than one household and sharing facilities. Larger HMOs generally fall outside those classes as sui generis uses, subject to assessment of the facts.

A C3-to-C4 permitted development right can be removed by an Article 4 direction. Planning use and housing licensing are separate: a lawful C4 use does not itself provide an HMO licence or establish that a room meets licensing standards.

C2 covers specified residential institutional uses, including certain care-related accommodation. Whether a particular supported-living arrangement is C2, C3 or another use is fact-sensitive, including the nature of care and the way residents occupy the premises.

Obtain specialist planning advice for the real operating model. Relabelling a shared house as supported accommodation does not automatically change its lawful use or remove licensing and building-control duties.

Some changes from eligible commercial uses to dwellings can fall under specific permitted development classes, such as Class MA for qualifying Class E premises, with prior approval and detailed conditions. Do not assume every shop, office or café qualifies.

Check the current legislation for exclusions, lawful-use history, Article 4 restrictions and the prior approval matters applicable to the proposal. External alterations may require separate permission. Building regulations, adequate living conditions, fire safety and access must still be resolved.

Assess refuse, cycle parking, access, noise, ventilation, daylight, drainage and services alongside the proposed occupation. For conversions, structure, sound insulation and fire compartmentation can be major feasibility issues.

If the business model or intended occupancy changes during design, reassess both planning and licensing before signing a lease, purchasing or starting work. A permission for one operating model should not be assumed to authorise another.