Extending your home in Haverhill
Planning an extension in Haverhill? Compare extension types, see guide prices adjusted for Haverhill and book a free site visit.
- Postcode districtsCB9
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Areas we cover around Haverhill
Across CB9, we can visit, measure and advise. We also work in nearby Newmarket (11 miles), Sudbury (13 miles), Bury St Edmunds (16 miles), Stowmarket (25 miles), Ipswich (30 miles). For homes towards Essex, Braintree is around 15 miles away.
Haverhill extension prices at a glance
Use these Haverhill 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 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
Which extension suits a Haverhill home?
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.
For many houses here, single-storey rear extensions, bungalow extensions or double-storey extensions gives the most useful space for the budget.
Approvals for an extension in Haverhill
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).
Choose an extension type
- Extensions over a garage · from £25,000
- Porch extensions · from £4,200
- Double-storey extensions · from £40,000
- Home office extensions · from £16,500
- Glass box extensions · from £31,500
- Annexe extensions · from £58,000
- Planning permission for extensions · from £350
- Flat roof extensions · from £22,000
- Timber frame extensions · from £22,000
- Orangery extensions · from £31,500
- Bedroom extensions · from £27,500
- Side return extensions · from £19,000
- Utility and boot room extensions · from £14,500
- Pitched roof extensions · from £23,500
- Single-storey rear extensions · from £22,000
- Extension plans and drawings · from £1,250
- Side extensions · from £23,000
- Conservatory replacement extensions · from £21,000
- Bungalow extensions · from £27,500
- Building regulations for extensions · from £950
- Wraparound extensions · from £38,000
- Kitchen extensions · from £28,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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 Haverhill
How much does an extension cost in Haverhill?
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.
How long does an extension take in Haverhill?
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 I need planning permission for an extension in Haverhill?
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 Haverhill
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.