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 Wrap-Around Extension in Crawley?
A wrap-around extension combines a side and rear extension into one L-shaped structure. This creates a large open-plan space but must comply with the PD rules for both side and rear extensions simultaneously.
Planning in Crawley
83%
of planning applications granted
93%
decided within the statutory or agreed time
26%
of householder applications decided within 8 weeks
In the four quarters to 2026 Q1, Crawley decided 218 planning applications. 122 of these were householder projects such as extensions, loft conversions and outbuildings, of which 82% were granted.
Planning statistics: MHCLG planning application statistics, the four quarters to 2026 Q1. Conservation area and Article 4 data: planning.data.gov.uk, © Historic England / Crown copyright. Open Government Licence v3.0.
Important: Additional Restrictions May Apply in Crawley
Crawley has 13 conservation areas. These include Brighton Road Conservation Area, Dyers Almshouses Conservation Area, Forestfield and Shrublands Conservation Area, Gossops Green Neighbourhood Centre Conservation Area, Hazelwick Road Conservation Area, High Street Conservation Area. If your property is in a conservation area, some or all permitted development rights may be restricted. For example, you may need planning permission for changes that would normally be permitted, including alterations to the roof, cladding, or extensions visible from a public highway.
Crawley has 19 recorded Article 4 directions. Article 4 directions remove specific permitted development rights in defined areas. If your property is covered by an Article 4 direction, you may need planning permission for work that would normally be permitted. Contact Crawley planning department to check whether an Article 4 direction applies to your property.
Check with Crawley planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for a Wrap-Around Extension
Whether a wrap-around extension falls under permitted development depends on the specifics, as it must comply with PD rules for both side and rear extensions at the same time. In practice, many wrap-around extensions exceed PD limits and require a planning application.
Conditions
- 1Must satisfy both side extension and rear extension PD conditions simultaneously
- 2Side component must not exceed half the width of the original house
- 3Rear component must not exceed 3m (semi/terraced) or 4m (detached) depth under standard PD
- 4Materials must match the existing dwelling
- 5Cumulative additions must not cover more than half the curtilage
Size and Dimension Limits
- Side: must not exceed half the original house width
- Rear: 3m (semi/terraced) or 4m (detached) under standard PD
- Maximum height: 4m
- Eaves: 3m if within 2m of a boundary
When Permitted Development Does Not Apply
- Often exceeds PD limits due to cumulative impact, requiring a full planning application
- Must not cover more than half the curtilage (total of all extensions and outbuildings)
- Not permitted development in designated areas for the side element
- Previous extensions and outbuildings count towards the cumulative limits
What About Building Regulations?
Building regulations approval is likely required
Building Regulations approval required covering all structural, thermal, ventilation, drainage, fire safety, and electrical requirements. The junction between side and rear elements requires careful structural detailing.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Crawley building control or use an approved inspector.
How to Apply in Crawley
If you need planning permission for your wrap-around extension, you can apply through Crawley's planning department or via the national Planning Portal.
If your project is permitted development and you want written confirmation, you can apply for a Lawful Development Certificate (LDC) from Crawley. This provides proof that your project does not need planning permission, which can be helpful when selling your property.
What Happens If I Build Without Permission?
Enforcement is a significant risk for wrap-around extensions built without permission, as they are highly visible and substantially alter the dwelling. The council can require demolition. Mortgage lenders and buyers' solicitors will scrutinise these carefully.
Frequently Asked Questions
Do I need planning permission for a wrap-around extension in Crawley?
Does a wrap-around extension in Crawley need building regulations?
How do I apply for planning permission in Crawley?
How long does planning permission take in Crawley?
What percentage of planning applications does Crawley approve?
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