St Neots house extensions
Planning an extension in St Neots? Compare extension types, see guide prices adjusted for St Neots and book a free site visit.
- Postcode districtsPE19
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in St Neots
Use these St Neots 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) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Double-storey extensions | 32 m² | £61,000 – £80,000 |
Covering St Neots and nearby
We cover St Neots and the postcode districts PE19. Nearby, we also take on projects in Huntingdon (9 miles), Cambridge (16 miles), Peterborough (25 miles), Ely (26 miles), March (28 miles). Just over the Bedfordshire border, Bedford is about 10 miles away.
Which extension suits a St Neots home?
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, single-storey rear extensions and wraparound extensions are often the strongest options, with double-storey extensions worth considering where there is room.
Planning rules in St Neots
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).
Extension types and starting prices
- Kitchen extensions · from £28,500
- Single-storey rear extensions · from £22,000
- Utility and boot room extensions · from £14,500
- Side extensions · from £23,000
- Bedroom extensions · from £27,500
- Wraparound extensions · from £38,000
- Orangery extensions · from £31,500
- Building regulations for extensions · from £950
- Timber frame extensions · from £22,000
- Flat roof extensions · from £22,000
- Glass box extensions · from £31,500
- Extension plans and drawings · from £1,250
- Pitched roof extensions · from £23,500
- Extensions over a garage · from £25,000
- Bungalow extensions · from £27,500
- Annexe extensions · from £58,000
- Side return extensions · from £19,000
- Planning permission for extensions · from £350
- Conservatory replacement extensions · from £21,000
- Home office extensions · from £16,500
- Double-storey extensions · from £40,000
- Porch extensions · from £4,200
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
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 St Neots
How much does an extension cost in St Neots?
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 cover all of St Neots?
Yes, including the surrounding parts of Cambridgeshire. Site visits are free and there is no obligation.
Do I need planning permission for an extension in St Neots?
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.
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.
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 St Neots
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.