Extending your home in Dartford
More space without moving: we plan and build extensions across Dartford, with one team for the drawings, the council and the build.
- Postcode districtsDA1, DA2, DA9
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Dartford home?
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.
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.
Do extensions in Dartford need planning permission?
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).
Dartford and surrounding towns
We cover Dartford and the postcode districts DA1, DA2, DA9. We also work in nearby Swanley (4 miles), Gravesend (7 miles), Strood (12 miles), Sevenoaks (12 miles), Rochester (13 miles). For homes towards Greater London, Bexley is around 3 miles away.
Dartford extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Dartford they are adjusted by ×1.12, the factor we use across South East England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
Every extension type in Dartford
- Porch extensions · from £4,450
- Bedroom extensions · from £29,000
- Building regulations for extensions · from £1,000
- Planning permission for extensions · from £350
- Utility and boot room extensions · from £15,500
- Wraparound extensions · from £40,000
- Timber frame extensions · from £23,500
- Double-storey extensions · from £42,500
- Extension plans and drawings · from £1,300
- Glass box extensions · from £33,500
- Extensions over a garage · from £26,500
- Annexe extensions · from £61,500
- Conservatory replacement extensions · from £22,000
- Side return extensions · from £20,000
- Flat roof extensions · from £23,500
- Side extensions · from £24,500
- Bungalow extensions · from £29,000
- Pitched roof extensions · from £24,500
- Home office extensions · from £17,500
- Orangery extensions · from £33,500
- Kitchen extensions · from £30,000
- Single-storey rear extensions · from £23,500
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Dartford
How much does an extension cost in Dartford?
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.
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.
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 Dartford?
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 Dartford
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.