House extensions in Maidstone
Every type of house extension in Maidstone, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsME14, ME15, ME16, ME17, ME18, ME20
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Maidstone extension prices at a glance
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) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
Choosing the right extension in Maidstone
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, wraparound extensions and orangery extensions are often the strongest options, with double-storey extensions worth considering where there is room.
Approvals for an extension in Maidstone
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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).
Maidstone and surrounding towns
Across ME14, ME15, ME16, ME17, ME18, ME20, we can visit, measure and advise. Nearby, we also take on projects in Chatham (8 miles), Rochester (8 miles), Gillingham (9 miles), Strood (9 miles), Sittingbourne (11 miles). Just over the Essex border, Grays is about 17 miles away.
Choose an extension type
- Single-storey rear extensions · from £23,500
- Glass box extensions · from £33,500
- Conservatory replacement extensions · from £22,000
- Building regulations for extensions · from £1,000
- Kitchen extensions · from £30,000
- Wraparound extensions · from £40,000
- Extensions over a garage · from £26,500
- Home office extensions · from £17,500
- Utility and boot room extensions · from £15,500
- Double-storey extensions · from £42,500
- Planning permission for extensions · from £350
- Bungalow extensions · from £29,000
- Side extensions · from £24,500
- Porch extensions · from £4,450
- Extension plans and drawings · from £1,300
- Annexe extensions · from £61,500
- Flat roof extensions · from £23,500
- Side return extensions · from £20,000
- Pitched roof extensions · from £24,500
- Bedroom extensions · from £29,000
- Timber frame extensions · from £23,500
- Orangery extensions · from £33,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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 Maidstone
How much does an extension cost in Maidstone?
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 Maidstone?
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 Maidstone?
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 cover all of Maidstone?
Yes, including the surrounding parts of Kent. Site visits are free and there is no obligation.
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.
Book a free site visit in Maidstone
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.