Extensions in Sandown: design, planning and build
More space without moving: we plan and build extensions across Sandown, with one team for the drawings, the council and the build.
- Postcode districtsPO36, PO37
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Sandown
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).
Areas we cover around Sandown
Postcode districts we cover around Sandown include PO36, PO37. The same team covers Ryde (5 miles), Newport, Isle of Wight (7 miles), Cowes (10 miles), all within easy reach.
Which extension suits a Sandown home?
The South East has a broad mix of 1930s semis, post-war estates, newer developments and period cottages, and many houses have enough garden for a generous rear extension.
The types we would usually look at first for a home in Sandown are double-storey extensions, single-storey rear extensions and orangery extensions, depending on the garden and how the house is laid out.
What extensions cost in Sandown
Prices on this page use our South East England factor of ×1.12, 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) |
|---|---|---|
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
Choose an extension type
- Flat roof extensions · from £23,500
- Extension plans and drawings · from £1,300
- Wraparound extensions · from £40,000
- Bungalow extensions · from £29,000
- Side extensions · from £24,500
- Porch extensions · from £4,450
- Home office extensions · from £17,500
- Timber frame extensions · from £23,500
- Building regulations for extensions · from £1,000
- Annexe extensions · from £61,500
- Kitchen extensions · from £30,000
- Double-storey extensions · from £42,500
- Glass box extensions · from £33,500
- Extensions over a garage · from £26,500
- Side return extensions · from £20,000
- Single-storey rear extensions · from £23,500
- Conservatory replacement extensions · from £22,000
- Planning permission for extensions · from £350
- Bedroom extensions · from £29,000
- Utility and boot room extensions · from £15,500
- Pitched roof extensions · from £24,500
- Orangery extensions · from £33,500
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 draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
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 Sandown
How much does an extension cost in Sandown?
Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.
How long does an extension take in Sandown?
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.
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 Sandown, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Sandown
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.