This is general guidance based on standard permitted development rights in England. Rules differ for listed buildings, conservation areas, and properties with Article 4 directions. Always confirm with your local planning authority before starting work.
Do I Need Planning Permission for a Change of Use?
Changing how a building or land is used (for example, from residential to commercial, or from a dwelling to a house in multiple occupation). Most changes of use require planning permission, though some are permitted under the Use Classes Order.
The General Position
This project typically requires a formal planning application to your local council. You will need to submit plans and wait for approval before starting work.
Planning permission is usually required for a change of use. However, some changes are permitted under Part 3 of the GPDO. For example, a dwelling (Use Class C3) can be changed to a small HMO for up to 6 people (Use Class C4) without planning permission under Class L. Other changes between use classes may be permitted or may require prior approval.
Conditions and Requirements
- 1Most changes of use require a planning application
- 2C3 (dwelling) to C4 (small HMO, up to 6 people): PD under Part 3, Class L
- 3Some commercial-to-residential conversions are PD under prior approval (Class MA, formerly Class O)
- 4Prior approval applications are assessed on specific criteria (flood risk, transport, contamination, etc.)
- 5Article 4 directions can remove C3 to C4 PD rights (common in areas with high HMO concentrations)
Size and Dimension Limits
- Depends on the specific change of use; no general dimensions apply
When Permitted Development Does Not Apply
- Article 4 directions are widely used to restrict C3 to C4 changes in university towns and cities
- Prior approval for commercial-to-residential has minimum space standards and other conditions
- Some changes of use also require Building Regulations approval (especially to residential)
- The Use Classes Order defines what constitutes a material change of use
What About Building Regulations?
Building Regulations apply when a building is being converted to a different use, particularly to residential use. Covers fire safety (means of escape, fire detection, fire separation), structural adequacy, sound insulation, thermal performance, ventilation, drainage, and accessibility. The specific requirements depend on the new use.
Building regulations are separate from planning permission. You may need both, one, or neither depending on your project. Building regulations cover the safety and quality of building work, including structural integrity, fire safety, insulation, ventilation, and drainage.
How to Apply for Planning Permission
Check if you need permission
Review the permitted development rules above. If in doubt, contact your council or apply for a Lawful Development Certificate.
Prepare your application
You will need scaled drawings, a site plan, and a completed application form. An architect or planning consultant can help with this.
Submit to your local council
Applications can be submitted online via the Planning Portal or directly to your council. Select your council below for a direct link.
Wait for a decision
8 weeks for householder applications; 13 weeks for major applications. Prior approval: 56 days..
Application cost: £258 for householder; fees vary for other application types. Prior approval fees vary by category..
What Happens If I Build Without Permission?
High enforcement risk. Unauthorised changes of use are a serious planning breach. The council can serve an enforcement notice requiring the use to revert to the lawful use. For changes to residential use, there is a 4-year enforcement time limit; for other changes of use, it is 10 years. Operating a business from a residential property without permission can also attract enforcement.
Find a Architect for Your Change of Use
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Select Your Council
Choose your local council for guidance specific to your area, including links to apply and whether your council has conservation areas or Article 4 directions that could affect your project.
London
South East
South West
East of England
East Midlands
West Midlands
North East
North West
Yorkshire and the Humber
CA = has conservation areas. A4 = has Article 4 directions. These may restrict your permitted development rights.