Extending your home in Gillingham
From a small utility to a two-storey addition, we take on house extensions throughout Gillingham, starting with a free visit and a planning check.
- Postcode districtsME1, ME2, ME4, ME5, ME7, ME8
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Gillingham
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.
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).
Where we work near Gillingham
We cover Gillingham and the postcode districts ME1, ME2, ME4, ME5, ME7, ME8. The same team covers Chatham (1 mile), Rochester (2 miles), Strood (3 miles), Gravesend (8 miles), Maidstone (9 miles), all within easy reach. Just over the Essex border, Canvey Island is about 9 miles away.
Popular extension prices in Gillingham
Use these Gillingham 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) |
|---|---|---|
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
Choosing the right extension in Gillingham
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
The types we would usually look at first for a home in Gillingham are wraparound extensions, orangery extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Choose an extension type
- Double-storey extensions · from £42,500
- Home office extensions · from £17,500
- Timber frame extensions · from £23,500
- Bedroom extensions · from £29,000
- Pitched roof extensions · from £24,500
- Planning permission for extensions · from £350
- Building regulations for extensions · from £1,000
- Glass box extensions · from £33,500
- Single-storey rear extensions · from £23,500
- Utility and boot room extensions · from £15,500
- Kitchen extensions · from £30,000
- Annexe extensions · from £61,500
- Extensions over a garage · from £26,500
- Porch extensions · from £4,450
- Side return extensions · from £20,000
- Flat roof extensions · from £23,500
- Bungalow extensions · from £29,000
- Side extensions · from £24,500
- Extension plans and drawings · from £1,300
- Conservatory replacement extensions · from £22,000
- Orangery extensions · from £33,500
- Wraparound extensions · from £40,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
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 Gillingham
How much does an extension cost in Gillingham?
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.
Do I need planning permission for an extension in Gillingham?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Gillingham, 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.
How long does an extension take in Gillingham?
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.
Book a free site visit in Gillingham
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.