Home extensions in Kettering
Planning an extension in Kettering? Compare extension types, see guide prices adjusted for Kettering and book a free site visit.
- Postcode districtsNN14, NN15, NN16
- Price regionEast Midlands (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Areas we cover around Kettering
Our survey diary covers Kettering, including NN14, NN15, NN16. Nearby, we also take on projects in Wellingborough (7 miles), Corby (7 miles), Rushden (9 miles), Market Harborough (10 miles), Northampton (12 miles). Oakham, in Rutland, is roughly 18 miles from Kettering and also on our list.
What works best for Kettering houses?
Homes across the East Midlands often have usable side land or a driveway beside the house, which opens up side and wraparound options.
Start by comparing conservatory replacement extensions, side extensions and single-storey rear extensions: between them they cover most of the layouts we see requested for houses like these.
Kettering extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Kettering they are adjusted by ×0.95, the factor we use across East Midlands.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
Approvals for an extension in Kettering
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.
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).
Choose an extension type
- Pitched roof extensions · from £21,000
- Kitchen extensions · from £25,500
- Planning permission for extensions · from £300
- Building regulations for extensions · from £850
- Single-storey rear extensions · from £19,500
- Extension plans and drawings · from £1,100
- Extensions over a garage · from £22,500
- Timber frame extensions · from £19,500
- Double-storey extensions · from £36,000
- Bungalow extensions · from £24,500
- Orangery extensions · from £28,500
- Porch extensions · from £3,800
- Flat roof extensions · from £19,500
- Annexe extensions · from £52,000
- Side extensions · from £20,500
- Utility and boot room extensions · from £13,000
- Bedroom extensions · from £24,500
- Home office extensions · from £15,000
- Conservatory replacement extensions · from £19,000
- Glass box extensions · from £28,500
- Side return extensions · from £17,000
- Wraparound extensions · from £34,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Kettering
How much does an extension cost in Kettering?
Using our East Midlands factor (×0.95), a standard-spec single-storey extension of 20 m² is a guide £38,500 to £49,500 including VAT, and a 32 m² two-storey extension £54,500 to £71,500. Your written price follows the survey.
How long does an extension take in Kettering?
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 Kettering?
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.
Book a free site visit in Kettering
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.