Canvey Island house extensions
More space without moving: we plan and build extensions across Canvey Island, with one team for the drawings, the council and the build.
- Postcode districtsSS7, SS8
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Where we work near Canvey Island
Our survey diary covers Canvey Island, including SS7, SS8. Neighbouring towns we cover include Benfleet (2 miles), Hadleigh (2 miles), Rayleigh (5 miles), Southend-on-Sea (6 miles), Basildon (6 miles). For homes towards Kent, Gillingham is around 9 miles away.
Approvals for an extension in Canvey Island
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 Canvey Island home?
The East of England mixes market-town terraces, inter-war semis and modern estates. Clay soils are common in parts of the region, which can affect foundation design.
Depending on the plot, double-storey extensions and single-storey rear extensions are often the strongest options, with bungalow extensions worth considering where there is room.
Guide prices for Canvey Island
Use these Canvey Island 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 | £47,000 – £59,500 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Double-storey extensions | 32 m² | £61,000 – £80,000 |
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
Extension types and starting prices
- Side extensions · from £23,000
- Kitchen extensions · from £28,500
- Utility and boot room extensions · from £14,500
- Double-storey extensions · from £40,000
- Glass box extensions · from £31,500
- Orangery extensions · from £31,500
- Wraparound extensions · from £38,000
- Porch extensions · from £4,200
- Planning permission for extensions · from £350
- Home office extensions · from £16,500
- Bedroom extensions · from £27,500
- Flat roof extensions · from £22,000
- Bungalow extensions · from £27,500
- Pitched roof extensions · from £23,500
- Extension plans and drawings · from £1,250
- Extensions over a garage · from £25,000
- Timber frame extensions · from £22,000
- Building regulations for extensions · from £950
- Annexe extensions · from £58,000
- Conservatory replacement extensions · from £21,000
- Single-storey rear extensions · from £22,000
- Side return extensions · from £19,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Canvey Island
How much does an extension cost in Canvey Island?
Using our East of England factor (×1.06), a standard-spec single-storey extension of 20 m² is a guide £43,000 to £55,500 including VAT, and a 32 m² two-storey extension £61,000 to £80,000. 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.
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.
How long does an extension take in Canvey Island?
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 Canvey Island
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.