Extending your home in Sudbury
Planning an extension in Sudbury? Compare extension types, see guide prices adjusted for Sudbury and book a free site visit.
- Postcode districtsCO10
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Where we work near Sudbury
Across CO10, we can visit, measure and advise. Nearby, we also take on projects in Haverhill (13 miles), Bury St Edmunds (14 miles), Stowmarket (15 miles), Ipswich (18 miles), Newmarket (20 miles). Just over the Essex border, Colchester is about 13 miles away.
What extensions cost in Sudbury
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) |
|---|---|---|
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
Do extensions in Sudbury need planning permission?
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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Choosing the right extension in Sudbury
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, wraparound extensions and bungalow extensions are often the strongest options, with double-storey extensions worth considering where there is room.
All extension types we build in Sudbury
- Utility and boot room extensions · from £14,500
- Side extensions · from £23,000
- Bedroom extensions · from £27,500
- Flat roof extensions · from £22,000
- Conservatory replacement extensions · from £21,000
- Building regulations for extensions · from £950
- Side return extensions · from £19,000
- Extensions over a garage · from £25,000
- Single-storey rear extensions · from £22,000
- Orangery extensions · from £31,500
- Double-storey extensions · from £40,000
- Glass box extensions · from £31,500
- Timber frame extensions · from £22,000
- Planning permission for extensions · from £350
- Pitched roof extensions · from £23,500
- Kitchen extensions · from £28,500
- Porch extensions · from £4,200
- Home office extensions · from £16,500
- Bungalow extensions · from £27,500
- Annexe extensions · from £58,000
- Wraparound extensions · from £38,000
- Extension plans and drawings · from £1,250
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Sudbury
How much does an extension cost in Sudbury?
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.
How long does an extension take in Sudbury?
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.
Do I need planning permission for an extension in Sudbury?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Book a free site visit in Sudbury
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.