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 Single-Storey Side Extension in Peterborough?
A single-storey extension built to the side of your property, often used to add a utility room, downstairs WC, or to widen a kitchen.
Planning in Peterborough
84%
of planning applications granted
78%
decided within the statutory or agreed time
64%
of householder applications decided within 8 weeks
In the year to December 2025, Peterborough decided 706 planning applications. 352 of these were householder projects such as extensions, loft conversions and outbuildings, of which 89% were granted.
Planning statistics: MHCLG planning application statistics, the year to December 2025. 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 Peterborough
Peterborough has 30 conservation areas. These include Ailsworth Conservation Area, Alwalton Conservation Area, Bainton Conservation Area, Barnack Conservation Area, Castor Conservation Area, City Centre 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.
Peterborough has 108 recorded Article 4 directions. These include Aberfeldy Main Street, Barnack; Aberfoyle Main Street, Barnack; Baptist Church, Church Street, Stanground; Bay Tree Cottage Stamford Road, Barnack. 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 Peterborough planning department to check whether an Article 4 direction applies to your property.
Check with Peterborough planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for a Single-Storey Side Extension
Generally permitted under Part 1, Class A. The extension must not exceed half the width of the original house and must be single storey. It should be subordinate in scale to the main dwelling.
Conditions
- 1Must not exceed half the width of the original house
- 2Maximum height of 4m
- 3Eaves height maximum 3m if within 2m of a boundary
- 4Must be set back from the principal elevation or side elevation fronting a highway
- 5Materials must be similar in appearance to the existing house
Size and Dimension Limits
- Maximum height: 4m
- Eaves height: 3m if within 2m of a boundary
- Width: must not exceed half the width of the original dwelling
When Permitted Development Does Not Apply
- Must not cover more than half the curtilage
- Does not apply in front of the principal elevation
- In designated areas (conservation areas, AONB, etc.), side extensions are not permitted development
- Does not apply to flats or maisonettes
What About Building Regulations?
Building regulations approval is likely required
Building Regulations approval required for structural work, foundations, thermal insulation (Part L), ventilation, damp proofing, and any associated electrical or drainage work.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Peterborough building control or use an approved inspector.
How to Apply in Peterborough
If you need planning permission for your single-storey side extension, you can apply through Peterborough'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 Peterborough. 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?
The council can issue an enforcement notice requiring alterations or demolition. Side extensions are visible from public areas, making enforcement more likely if they breach planning rules. Indemnity insurance may be available for older unauthorised extensions but does not guarantee protection.
Frequently Asked Questions
Do I need planning permission for a single-storey side extension in Peterborough?
Does a single-storey side extension in Peterborough need building regulations?
How do I apply for planning permission in Peterborough?
How long does planning permission take in Peterborough?
What percentage of planning applications does Peterborough approve?
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