Plumstead house extensions
We design and build house extensions for homes in Plumstead and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsDA16, SE2, SE18, SE28
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Do extensions in Plumstead 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 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).
Plumstead extension prices at a glance
Prices on this page use our London factor of ×1.3, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
Choosing the right extension in Plumstead
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, wraparound extensions and side return extensions are often the strongest options, with glass box extensions worth considering where there is room.
Covering Plumstead and nearby
Postcode districts we cover around Plumstead include DA16, SE2, SE18, SE28. Neighbouring towns we cover include Abbey Wood (1 mile), Welling (2 miles), Thamesmead (2 miles), Eltham (3 miles), Canning Town (3 miles). Dartford, in Kent, is roughly 6 miles from Plumstead and also on our list.
Choose an extension type
- Orangery extensions · from £39,000
- Conservatory replacement extensions · from £26,000
- Utility and boot room extensions · from £18,000
- Kitchen extensions · from £35,000
- Double-storey extensions · from £49,000
- Extensions over a garage · from £31,000
- Porch extensions · from £5,200
- Home office extensions · from £20,500
- Bedroom extensions · from £33,500
- Annexe extensions · from £71,500
- Wraparound extensions · from £46,500
- Extension plans and drawings · from £1,550
- Pitched roof extensions · from £28,500
- Planning permission for extensions · from £450
- Bungalow extensions · from £34,000
- Single-storey rear extensions · from £27,000
- Side extensions · from £28,500
- Building regulations for extensions · from £1,150
- Flat roof extensions · from £27,000
- Side return extensions · from £23,000
- Glass box extensions · from £39,000
- Timber frame extensions · from £27,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
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 Plumstead
How much does an extension cost in Plumstead?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Plumstead, 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.
Book a free site visit in Plumstead
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.