House extensions in West Ham
Planning an extension in West Ham? Compare extension types, see guide prices adjusted for West Ham and book a free site visit.
- Postcode districtsE6, E7, E13, E15, E16
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in West Ham
Use these West Ham 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) |
|---|---|---|
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Covering West Ham and nearby
We cover West Ham and the postcode districts E6, E7, E13, E15, E16. Nearby, we also take on projects in Stratford (1 mile), Canning Town (1 mile), Bow (2 miles), Manor Park (2 miles), Leytonstone (2 miles). Dartford, in Kent, is roughly 10 miles from West Ham and also on our list.
Approvals for an extension in West Ham
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.
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 West Ham home?
In London, space is at a premium and gardens are often short, so side returns, wraparounds and carefully planned rear extensions tend to make the most of every metre.
The types we would usually look at first for a home in West Ham are kitchen extensions, glass box extensions and side return extensions, depending on the garden and how the house is laid out.
Choose an extension type
- Bungalow extensions · from £34,000
- Planning permission for extensions · from £450
- Home office extensions · from £20,500
- Conservatory replacement extensions · from £26,000
- Extension plans and drawings · from £1,550
- Side return extensions · from £23,000
- Glass box extensions · from £39,000
- Building regulations for extensions · from £1,150
- Orangery extensions · from £39,000
- Bedroom extensions · from £33,500
- Side extensions · from £28,500
- Pitched roof extensions · from £28,500
- Extensions over a garage · from £31,000
- Kitchen extensions · from £35,000
- Porch extensions · from £5,200
- Utility and boot room extensions · from £18,000
- Flat roof extensions · from £27,000
- Single-storey rear extensions · from £27,000
- Wraparound extensions · from £46,500
- Annexe extensions · from £71,500
- Timber frame extensions · from £27,000
- Double-storey extensions · from £49,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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 West Ham
How much does an extension cost in West Ham?
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 I need planning permission for an extension in West Ham?
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.
How long does an extension take in West Ham?
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 West Ham
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.