Extending your home in Dereham
Looking to extend your home in Dereham? Start here: extension types, guide prices for Dereham, the planning rules that apply and how a project runs.
- Postcode districtsNR19
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Dereham
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.
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 Dereham
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.
The types we would usually look at first for a home in Dereham are bungalow extensions, wraparound extensions and double-storey extensions, depending on the garden and how the house is laid out.
Dereham and surrounding towns
Postcode districts we cover around Dereham include NR19. Nearby, we also take on projects in Wymondham (11 miles), Norwich (16 miles), Thetford (20 miles), North Walsham (22 miles), Cromer (23 miles). For homes towards Suffolk, Bury St Edmunds is around 32 miles away.
Dereham 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) |
|---|---|---|
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
Choose an extension type
- Orangery extensions · from £31,500
- Wraparound extensions · from £38,000
- Flat roof extensions · from £22,000
- Double-storey extensions · from £40,000
- Porch extensions · from £4,200
- Kitchen extensions · from £28,500
- Extensions over a garage · from £25,000
- Bedroom extensions · from £27,500
- Annexe extensions · from £58,000
- Glass box extensions · from £31,500
- Conservatory replacement extensions · from £21,000
- Pitched roof extensions · from £23,500
- Timber frame extensions · from £22,000
- Utility and boot room extensions · from £14,500
- Single-storey rear extensions · from £22,000
- Side return extensions · from £19,000
- Building regulations for extensions · from £950
- Home office extensions · from £16,500
- Extension plans and drawings · from £1,250
- Side extensions · from £23,000
- Bungalow extensions · from £27,500
- Planning permission for extensions · from £350
Free site visit
We visit your Dereham home, measure up, talk through what you want and check the planning position.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Dereham
How much does an extension cost in Dereham?
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.
Do I need planning permission for an extension in Dereham?
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.
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
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.
Book a free site visit in Dereham
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.