Home extensions in Ampthill
From a small utility to a two-storey addition, we take on house extensions throughout Ampthill, starting with a free visit and a planning check.
- Postcode districtsMK45
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Do extensions in Ampthill 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 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).
Choosing the right extension in Ampthill
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, wraparound extensions and single-storey rear extensions are often the strongest options, with bungalow extensions worth considering where there is room.
Ampthill and surrounding towns
Postcode districts we cover around Ampthill include MK45. Nearby, we also take on projects in Kempston (6 miles), Bedford (8 miles), Dunstable (10 miles), Leighton Buzzard (10 miles), Luton (11 miles). For homes towards Buckinghamshire, Bletchley is around 10 miles away.
What extensions cost in Ampthill
Use these Ampthill guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
Extension types and starting prices
- Single-storey rear extensions · from £22,000
- Utility and boot room extensions · from £14,500
- Planning permission for extensions · from £350
- Wraparound extensions · from £38,000
- Flat roof extensions · from £22,000
- Porch extensions · from £4,200
- Bungalow extensions · from £27,500
- Bedroom extensions · from £27,500
- Side extensions · from £23,000
- Pitched roof extensions · from £23,500
- Timber frame extensions · from £22,000
- Glass box extensions · from £31,500
- Conservatory replacement extensions · from £21,000
- Building regulations for extensions · from £950
- Kitchen extensions · from £28,500
- Extension plans and drawings · from £1,250
- Home office extensions · from £16,500
- Side return extensions · from £19,000
- Annexe extensions · from £58,000
- Double-storey extensions · from £40,000
- Orangery extensions · from £31,500
- Extensions over a garage · from £25,000
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
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 Ampthill
How much does an extension cost in Ampthill?
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 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.
Do I need planning permission for an extension in Ampthill?
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 Ampthill
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.