Extensions in Canterbury: design, planning and build
From a small utility to a two-storey addition, we take on house extensions throughout Canterbury, starting with a free visit and a planning check.
- Postcode districtsCT1, CT2
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Canterbury houses?
The South East has a broad mix of 1930s semis, post-war estates, newer developments and period cottages, and many houses have enough garden for a generous rear extension.
Depending on the plot, double-storey extensions and single-storey rear extensions are often the strongest options, with orangery extensions worth considering where there is room.
Where we work near Canterbury
Site visits are available across Canterbury (CT1, CT2). The same team covers Whitstable (6 miles), Herne Bay (7 miles), Faversham (9 miles), Ashford, Kent (13 miles), Folkestone (14 miles), all within easy reach. For homes towards Essex, Southend-on-Sea is around 24 miles away.
Planning rules in Canterbury
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.
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).
Popular extension prices in Canterbury
Prices on this page use our South East England factor of ×1.12, 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) |
|---|---|---|
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
Every extension type in Canterbury
- Utility and boot room extensions · from £15,500
- Side extensions · from £24,500
- Annexe extensions · from £61,500
- Planning permission for extensions · from £350
- Pitched roof extensions · from £24,500
- Glass box extensions · from £33,500
- Extension plans and drawings · from £1,300
- Home office extensions · from £17,500
- Wraparound extensions · from £40,000
- Bedroom extensions · from £29,000
- Double-storey extensions · from £42,500
- Conservatory replacement extensions · from £22,000
- Timber frame extensions · from £23,500
- Building regulations for extensions · from £1,000
- Porch extensions · from £4,450
- Side return extensions · from £20,000
- Orangery extensions · from £33,500
- Extensions over a garage · from £26,500
- Single-storey rear extensions · from £23,500
- Flat roof extensions · from £23,500
- Bungalow extensions · from £29,000
- Kitchen extensions · from £30,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
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 Canterbury
How much does an extension cost in Canterbury?
Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.
How long does an extension take in Canterbury?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Canterbury, and the guide-price tool gives a range for your own size and finish in about a minute.
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 I need planning permission for an extension in Canterbury?
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 Canterbury
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.