Side extension in Croydon: Planning Permission Guide
A complete guide to building a side extension in Croydon, covering permitted development rules, costs, and professional requirements.
Check if your side extension qualifiesSide extensions in Croydon at a glance
approved *
application fee
weeks typical
Based on 14 decided applications in Croydon over 12 months (14 granted, 0 refused). * Limited data — treat as indicative.
Croydon is a large and diverse south London borough with conservation areas around Croydon Minster, Addington Village, Coulsdon, South Norwood, and Waddon. The south of the borough borders Green Belt and the Surrey Hills AONB (National Landscape), triggering Article 2(3) designated land rules in the Biggin Hill and Kenley fringe. Article 4 Directions restrict specific rights in some conservation areas including parts of Shirley, Coulsdon, and Upper Norwood. Flood zones apply along the Wandle valley.
Want your personalised odds?
Approval probability, 5 nearest comparables, refusal reasons — for your specific address.
Recent side extension decisions in Croydon
The 5 most recent decided applications. Addresses redacted to postcode area.
Demolition of existing garage; erection of single storey side extension with steps
Erection of a two storey side extension with hipped roof and single storey side extensions, loft conversion including one dormer, porch o…
Erection of front rooflights and a rear rooflight, rear dormer window, infill side extension, alterations to two storey rear projection, …
Conversion and extension of existing loft space above existing side extension to form an en-suite bathroom and dressing room and associat…
Erection of single-storey front extension, single/two-storey side and rear wraparound extension (in place of the existing side extension,…
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 London
Side extension costs in London 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 Croydon. For personalised approval odds and nearby comparables, get the full report above.
Free 2-min check