Dartford, Kent
Two-storey rear extension in Dartford
For homes in Dartford, a two-storey rear extension is often the simplest way to gain space without moving. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We take it from survey to completion certificate.
We cover Dartford (DA1) as part of our Kent work. In Dartford, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a two-storey rear extension cost in Dartford?
Guide prices for a two-storey rear extension in Dartford start from our South East England rate of £2,020–£3,020 per square metre, including VAT. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £60,500–£90,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £97,000–£145,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a two-storey rear extension in Dartford?
Planning for a two-storey rear extension in Dartford follows the English householder rules.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Dartford like to extend?
Commuter semis and detached houses make up much of Dartford, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a two-storey rear extension in Dartford comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Two-storey rear extensions near Dartford
Neighbouring places we cover include Bexley (2.8 miles) and Swanley (3.8 miles).
- Two-storey rear extension in Bexley
- Two-storey rear extension in Swanley
- Two-storey rear extension in Belvedere
- Two-storey rear extension in Swanscombe
- Two-storey rear extension in Chafford Hundred
Other work in Dartford:
FAQ
Two-storey rear extension questions in Dartford
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Is the site visit in Dartford free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
What postcode areas do you cover around Dartford?
Including DA1, and the surrounding Kent area.
Do you handle building control in Dartford?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.