House extensions in Walthamstow
More space without moving: we plan and build extensions across Walthamstow, with one team for the drawings, the council and the build.
- Postcode districtsE4, E10, E11, E17, E18, N17
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Choosing the right extension in Walthamstow
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, glass box extensions and kitchen extensions are often the strongest options, with side return extensions worth considering where there is room.
Guide prices for Walthamstow
We publish guide prices so you can budget before anyone visits. For Walthamstow they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
Approvals for an extension in Walthamstow
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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).
Where we work near Walthamstow
Postcode districts we cover around Walthamstow include E4, E10, E11, E17, E18, N17. The same team covers Leytonstone (2 miles), Tottenham (2 miles), Woodford Green (2 miles), Stamford Hill (3 miles), Chingford (3 miles), all within easy reach. For homes towards Essex, Waltham Abbey is around 7 miles away.
Extension types and starting prices
- Double-storey extensions · from £49,000
- Utility and boot room extensions · from £18,000
- Flat roof extensions · from £27,000
- Porch extensions · from £5,200
- Side return extensions · from £23,000
- Building regulations for extensions · from £1,150
- Extension plans and drawings · from £1,550
- Single-storey rear extensions · from £27,000
- Conservatory replacement extensions · from £26,000
- Wraparound extensions · from £46,500
- Orangery extensions · from £39,000
- Planning permission for extensions · from £450
- Kitchen extensions · from £35,000
- Pitched roof extensions · from £28,500
- Side extensions · from £28,500
- Bedroom extensions · from £33,500
- Timber frame extensions · from £27,000
- Annexe extensions · from £71,500
- Home office extensions · from £20,500
- Bungalow extensions · from £34,000
- Glass box extensions · from £39,000
- Extensions over a garage · from £31,000
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 produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Walthamstow
How much does an extension cost in Walthamstow?
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.
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 Walthamstow, and the guide-price tool gives a range for your own size and finish in about a minute.
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.
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 Walthamstow
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.