Worcester Park house extensions
Planning an extension in Worcester Park? Compare extension types, see guide prices adjusted for Worcester Park and book a free site visit.
- Postcode districtsKT3, KT4, SM3
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Popular extension prices in Worcester Park
Every figure below is a guide for Worcester Park, 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) |
|---|---|---|
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| 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 |
Do extensions in Worcester Park need planning permission?
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 Worcester Park 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.
The types we would usually look at first for a home in Worcester Park are kitchen extensions, glass box extensions and side return extensions, depending on the garden and how the house is laid out.
Where we work near Worcester Park
Across KT3, KT4, SM3, we can visit, measure and advise. Neighbouring towns we cover include New Malden (2 miles), Morden (2 miles), Surbiton (2 miles), Hook (3 miles), Sutton (3 miles). Ewell, in Surrey, is roughly 2 miles from Worcester Park and also on our list.
All extension types we build in Worcester Park
- Wraparound extensions · from £46,500
- Planning permission for extensions · from £450
- Utility and boot room extensions · from £18,000
- Pitched roof extensions · from £28,500
- Porch extensions · from £5,200
- Extension plans and drawings · from £1,550
- Single-storey rear extensions · from £27,000
- Double-storey extensions · from £49,000
- Kitchen extensions · from £35,000
- Bedroom extensions · from £33,500
- Annexe extensions · from £71,500
- Glass box extensions · from £39,000
- Orangery extensions · from £39,000
- Conservatory replacement extensions · from £26,000
- Bungalow extensions · from £34,000
- Side return extensions · from £23,000
- Timber frame extensions · from £27,000
- Side extensions · from £28,500
- Building regulations for extensions · from £1,150
- Home office extensions · from £20,500
- Flat roof extensions · from £27,000
- Extensions over a garage · from £31,000
Free site visit
We visit your Worcester Park home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Worcester Park
How much does an extension cost in Worcester Park?
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.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
How long does an extension take in Worcester Park?
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Worcester Park
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.