Extending your home in Cowes
Every type of house extension in Cowes, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsPO31, PO32
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Guide prices for Cowes
Every figure below is a guide for Cowes, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
Areas we cover around Cowes
Postcode districts we cover around Cowes include PO31, PO32. Nearby, we also take on projects in Newport, Isle of Wight (4 miles), Ryde (6 miles), Sandown (10 miles).
Planning rules in Cowes
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).
What works best for Cowes houses?
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
For many houses here, wraparound extensions, orangery extensions or double-storey extensions gives the most useful space for the budget.
Every extension type in Cowes
- Utility and boot room extensions · from £15,500
- Porch extensions · from £4,450
- Building regulations for extensions · from £1,000
- Timber frame extensions · from £23,500
- Home office extensions · from £17,500
- Bungalow extensions · from £29,000
- Orangery extensions · from £33,500
- Annexe extensions · from £61,500
- Glass box extensions · from £33,500
- Single-storey rear extensions · from £23,500
- Bedroom extensions · from £29,000
- Double-storey extensions · from £42,500
- Wraparound extensions · from £40,000
- Kitchen extensions · from £30,000
- Extensions over a garage · from £26,500
- Extension plans and drawings · from £1,300
- Conservatory replacement extensions · from £22,000
- Pitched roof extensions · from £24,500
- Flat roof extensions · from £23,500
- Planning permission for extensions · from £350
- Side return extensions · from £20,000
- Side extensions · from £24,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
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 Cowes
How much does an extension cost in Cowes?
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.
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.
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.
Book a free site visit in Cowes
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.