Side extension in Chorley: Planning Permission Guide
A complete guide to building a side extension in Chorley, covering permitted development rules, costs, and professional requirements.
Based on 20 decided applications in Chorley over 36 months (13 granted, 7 refused).
Chorley has conservation areas around Chorley Town Centre, Astley Village, Eccleston, and Croston. Listed buildings cluster around Astley Hall (a Grade I listed 16th-century house) and around several historic village cores. The West Pennine Moors cover parts of the east of the borough. Green Belt covers substantial rural areas. Flood zones apply along the Yarrow and Douglas rivers. The borough mixes Victorian terraces with rural villages and later suburban development.
Personalised odds
5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent side extension decisions in Chorley
The 5 most recent decided applications. Addresses redacted to postcode area.
Application for a certificate of lawfulness for a proposed single storey side extension
Single storey side extension (following demolition of existing single storey side extension)
Minor non-material amendment to planning permission ref: 25/00504/FULHH (First floor side extension including balcony) to reduce the heig…
First floor side extension (retrospective)
Application for a certificate of lawfulness for a proposed rear dormer, installation of Velux roof windows to front, single storey side e…
These are borough-wide. See the 5 nearest to your address.
Get my report — £9Permitted Development Rules
Enlargement, improvement or other alteration of a dwellinghouse
GPDO 2015, Schedule 2, Part 1, Class A
Side extensions are also covered by Part 1, Class A of the GPDO. They must be single storey and cannot exceed half the width of the original house.
Key dimension limits
These are the maximum GPDO limits for a detached house with no constraints. Your actual limits depend on your property type, location, and any planning restrictions.
Enter your postcode to see the personalised limits for your side extension.
Check my limitsTypical Costs in North West England
Side extension costs in North West England depend on the width of your side return and the specification of the build.
Cost per m²
construction rate
Typical total
Based on 10–18 m²
Typically includes
Typically excludes
Costs vary depending on whether the side return is narrow or full-width.
Get a personalised cost estimate based on your actual side extension dimensions.
Get my estimateWhich Professionals Do You Need?
For a side extension, you'll typically need drawings for Building Regulations approval and may need a party wall surveyor if you share a boundary.
You'll need a party wall surveyor for this project.
A draughtsperson or architectural technician can prepare the plans needed for a single storey extension. A full architect may not be necessary.
Typical fee: £1,500–£3,500 (Plans + Building Regs)
Single storey extensions typically need structural calculations for any openings in existing walls and for foundations.
Typical fee: £500–£1,500
Your semi-detached house shares a boundary with neighbours. Extensions and loft work within 3 metres of a shared wall trigger the Party Wall Act.
Typical fee: £700–£1,500 (per neighbour)
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your side extension.
Get personalised guidanceConservation Areas & Listed Buildings
Side extensions are not permitted development in conservation areas or Areas of Outstanding Natural Beauty. You will need to apply for full planning permission.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
Check my propertyFrequently Asked Questions
Just want a quick yes/no for your side extension?
Run our free 2-minute check to see whether your project likely qualifies as permitted development in Chorley. For personalised approval odds and nearby comparables, get the £9 report.
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