Home extensions in Coulsdon
From a small utility to a two-storey addition, we take on house extensions throughout Coulsdon, starting with a free visit and a planning check.
- Postcode districtsCR5, CR8
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Coulsdon
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 single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
Guide prices for Coulsdon
Every figure below is a guide for Coulsdon, 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) |
|---|---|---|
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| 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 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
Covering Coulsdon and nearby
Postcode districts we cover around Coulsdon include CR5, CR8. Neighbouring towns we cover include Purley (2 miles), Wallington (3 miles), Sutton (3 miles), Carshalton (4 miles), South Croydon (4 miles). For homes towards Surrey, Banstead is around 3 miles away.
Choosing the right extension in Coulsdon
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.
The types we would usually look at first for a home in Coulsdon are side return extensions, glass box extensions and wraparound extensions, depending on the garden and how the house is laid out.
Choose an extension type
- Building regulations for extensions · from £1,150
- Glass box extensions · from £39,000
- Extension plans and drawings · from £1,550
- Flat roof extensions · from £27,000
- Extensions over a garage · from £31,000
- Porch extensions · from £5,200
- Double-storey extensions · from £49,000
- Planning permission for extensions · from £450
- Bedroom extensions · from £33,500
- Kitchen extensions · from £35,000
- Side extensions · from £28,500
- Single-storey rear extensions · from £27,000
- Utility and boot room extensions · from £18,000
- Annexe extensions · from £71,500
- Bungalow extensions · from £34,000
- Side return extensions · from £23,000
- Wraparound extensions · from £46,500
- Home office extensions · from £20,500
- Orangery extensions · from £39,000
- Timber frame extensions · from £27,000
- Pitched roof extensions · from £28,500
- Conservatory replacement extensions · from £26,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
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 Coulsdon
How much does an extension cost in Coulsdon?
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.
Do you cover all of Coulsdon?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Coulsdon?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Book a free site visit in Coulsdon
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.