Extending your home in Purley
Every type of house extension in Purley, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsCR0, CR2, CR5, CR8, CR9, SM6
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Purley home?
London's housing is dominated by Victorian and Edwardian terraces, many with a rear outrigger and a side return, and 1930s semis in the outer boroughs. Conservation areas are common, so the planning check comes first.
Depending on the plot, side return extensions and kitchen extensions are often the strongest options, with glass box extensions worth considering where there is room.
Planning and building control in Purley
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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Purley extension prices at a glance
Every figure below is a guide for Purley, adjusted for London build costs (×1.3) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Areas we cover around Purley
Site visits are available across Purley (CR0, CR2, CR5, CR8, CR9, SM6). Nearby, we also take on projects in Coulsdon (2 miles), South Croydon (2 miles), Wallington (3 miles), Carshalton (3 miles), Croydon (3 miles). Just over the Surrey border, Caterham is about 4 miles away.
Extension types and starting prices
- Extensions over a garage · from £31,000
- Bedroom extensions · from £33,500
- Single-storey rear extensions · from £27,000
- Kitchen extensions · from £35,000
- Annexe extensions · from £71,500
- Conservatory replacement extensions · from £26,000
- Utility and boot room extensions · from £18,000
- Porch extensions · from £5,200
- Pitched roof extensions · from £28,500
- Wraparound extensions · from £46,500
- Side extensions · from £28,500
- Side return extensions · from £23,000
- Orangery extensions · from £39,000
- Timber frame extensions · from £27,000
- Double-storey extensions · from £49,000
- Planning permission for extensions · from £450
- Bungalow extensions · from £34,000
- Home office extensions · from £20,500
- Flat roof extensions · from £27,000
- Building regulations for extensions · from £1,150
- Extension plans and drawings · from £1,550
- Glass box extensions · from £39,000
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
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Purley
How much does an extension cost in Purley?
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.
How long does an extension take in Purley?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Purley, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Purley
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.