Extensions in Stowmarket: design, planning and build
We design and build house extensions for homes in Stowmarket and the surrounding Suffolk area, with guide prices adjusted for the region.
- Postcode districtsIP14
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Stowmarket and nearby
Our survey diary covers Stowmarket, including IP14. Nearby, we also take on projects in Ipswich (11 miles), Bury St Edmunds (13 miles), Sudbury (15 miles), Woodbridge (17 miles), Felixstowe (22 miles). For homes towards Norfolk, Thetford is around 19 miles away.
Planning and building control in Stowmarket
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).
Stowmarket extension prices at a glance
Prices on this page use our East of England factor of ×1.06, 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) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Double-storey extensions | 32 m² | £61,000 – £80,000 |
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
What works best for Stowmarket houses?
Across the East of England many houses sit on generous plots, and single-storey and wraparound extensions are a natural fit.
Depending on the plot, bungalow extensions and wraparound extensions are often the strongest options, with single-storey rear extensions worth considering where there is room.
Choose an extension type
- Kitchen extensions · from £28,500
- Glass box extensions · from £31,500
- Timber frame extensions · from £22,000
- Double-storey extensions · from £40,000
- Pitched roof extensions · from £23,500
- Bedroom extensions · from £27,500
- Orangery extensions · from £31,500
- Extensions over a garage · from £25,000
- Side return extensions · from £19,000
- Single-storey rear extensions · from £22,000
- Building regulations for extensions · from £950
- Flat roof extensions · from £22,000
- Side extensions · from £23,000
- Wraparound extensions · from £38,000
- Bungalow extensions · from £27,500
- Extension plans and drawings · from £1,250
- Annexe extensions · from £58,000
- Utility and boot room extensions · from £14,500
- Planning permission for extensions · from £350
- Porch extensions · from £4,200
- Home office extensions · from £16,500
- Conservatory replacement extensions · from £21,000
Free site visit
We visit your Stowmarket home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
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 Stowmarket
How much does an extension cost in Stowmarket?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Stowmarket, 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.
How long does an extension take in Stowmarket?
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 Stowmarket
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.