Croydon house extensions
Looking to extend your home in Croydon? Start here: extension types, guide prices for Croydon, the planning rules that apply and how a project runs.
- Postcode districtsCR0, CR7, CR9, SE19, SE25, SM6
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Planning rules in Croydon
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Which extension suits a Croydon home?
Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.
Depending on the plot, glass box extensions and wraparound extensions are often the strongest options, with kitchen extensions worth considering where there is room.
Croydon extension prices at a glance
Use these Croydon guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
Covering Croydon and nearby
Postcode districts we cover around Croydon include CR0, CR7, CR9, SE19, SE25, SM6. We also work in nearby South Croydon (1 mile), South Norwood (2 miles), Upper Norwood (2 miles), Norbury (2 miles), Wallington (3 miles). Just over the Surrey border, Banstead is about 6 miles away.
All extension types we build in Croydon
- Pitched roof extensions · from £28,500
- Bedroom extensions · from £33,500
- Bungalow extensions · from £34,000
- Side extensions · from £28,500
- Glass box extensions · from £39,000
- Annexe extensions · from £71,500
- Conservatory replacement extensions · from £26,000
- Utility and boot room extensions · from £18,000
- Planning permission for extensions · from £450
- Double-storey extensions · from £49,000
- Orangery extensions · from £39,000
- Extensions over a garage · from £31,000
- Flat roof extensions · from £27,000
- Side return extensions · from £23,000
- Wraparound extensions · from £46,500
- Extension plans and drawings · from £1,550
- Home office extensions · from £20,500
- Single-storey rear extensions · from £27,000
- Kitchen extensions · from £35,000
- Timber frame extensions · from £27,000
- Porch extensions · from £5,200
- Building regulations for extensions · from £1,150
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Croydon
How much does an extension cost in Croydon?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Croydon, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do you cover all of Croydon?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Book a free site visit in Croydon
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.