Extensions in Herne Bay: design, planning and build
We design and build house extensions for homes in Herne Bay and the surrounding Kent area, with guide prices adjusted for the region.
- Postcode districtsCT6
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Herne Bay
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).
Choosing the right extension in Herne Bay
Homes across the South East range from Victorian terraces in the older town centres to large detached houses on the edges, so the right extension type varies street by street.
The types we would usually look at first for a home in Herne Bay are double-storey extensions, orangery extensions and wraparound extensions, depending on the garden and how the house is laid out.
Herne Bay extension prices at a glance
Every figure below is a guide for Herne Bay, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
Covering Herne Bay and nearby
Across CT6, we can visit, measure and advise. We also work in nearby Whitstable (5 miles), Canterbury (7 miles), Faversham (11 miles), Margate (11 miles), Ramsgate (13 miles). Southend-on-Sea, in Essex, is roughly 21 miles from Herne Bay and also on our list.
Every extension type in Herne Bay
- Single-storey rear extensions · from £23,500
- Building regulations for extensions · from £1,000
- Flat roof extensions · from £23,500
- Kitchen extensions · from £30,000
- Conservatory replacement extensions · from £22,000
- Side extensions · from £24,500
- Annexe extensions · from £61,500
- Double-storey extensions · from £42,500
- Utility and boot room extensions · from £15,500
- Planning permission for extensions · from £350
- Orangery extensions · from £33,500
- Side return extensions · from £20,000
- Glass box extensions · from £33,500
- Timber frame extensions · from £23,500
- Bungalow extensions · from £29,000
- Porch extensions · from £4,450
- Pitched roof extensions · from £24,500
- Bedroom extensions · from £29,000
- Extensions over a garage · from £26,500
- Wraparound extensions · from £40,000
- Extension plans and drawings · from £1,300
- Home office extensions · from £17,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Herne Bay
How much does an extension cost in Herne Bay?
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.
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 Herne Bay?
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.
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 Herne Bay
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.