Chelsfield, Kent
Rear extension planning drawings in Chelsfield
Thinking about a rear extension in Chelsfield? Measured survey, design options, planning drawings and the application, handled for you. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Chelsfield is covered from our Kent round, including BR5 and BR6. Rear extension applications in Kent are householder applications, which councils aim to decide within about eight weeks.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
What do rear extension planning drawings cost in Chelsfield?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension, or £2,000–£3,500 for a two-storey scheme. A householder planning application in England costs £548 (£575 for applications made from 8 December 2026), and a lawful development certificate for proposed work costs half the householder fee. Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a rear extension in Chelsfield?
The planning route for a rear extension in Chelsfield is set by England's householder rules and your council.
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.
Councils aim to decide householder applications within 8 weeks of validation, and prior approval within 42 days.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Chelsfield like to extend?
Commuter semis and detached houses make up much of Chelsfield, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a rear extension in Chelsfield 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.
Rear extension planning drawings near Chelsfield
Neighbouring places we cover include Orpington (1.7 miles) and Swanley (3.3 miles).
- Rear extension planning drawings in Orpington
- Rear extension planning drawings in Swanley
- Rear extension planning drawings in Bickley
- Rear extension planning drawings in Chislehurst
- Rear extension planning drawings in Sidcup
Other work in Chelsfield:
FAQ
Rear extension planning drawings questions in Chelsfield
Is the site visit in Chelsfield free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Chelsfield house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Can I see the design in 3D?
Yes; we produce simple 3D views so you can judge the size and light.
What do rear extension planning drawings cost in Chelsfield?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension and £2,000–£3,500 for a two-storey scheme, covering the measured survey, design options and the application. The council fee is extra.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.