Aylesbury, Buckinghamshire
Rear extension planning drawings in Aylesbury
Rear extension planning drawings in Aylesbury: measured survey, design options, planning drawings and the application, handled for you. We measure the house, show you what the rules allow, price it in writing and build it.
Aylesbury sits in Buckinghamshire, with postcode districts including HP19, HP20 and HP21. Rear extension applications in Buckinghamshire 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 Aylesbury?
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 Aylesbury?
Here is how the rules in England apply to a rear extension in Aylesbury.
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. 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 Aylesbury like to extend?
Commuter semis and detached houses make up much of Aylesbury, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a rear extension in Aylesbury 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 Aylesbury
We also build rear extensions in nearby Tring (6.8 miles) and Thame (8.4 miles).
- Rear extension planning drawings in Tring
- Rear extension planning drawings in Thame
- Rear extension planning drawings in Leighton Buzzard
- Rear extension planning drawings in Berkhamsted
- Rear extension planning drawings in Chesham
Other work in Aylesbury:
FAQ
Rear extension planning drawings questions in Aylesbury
Is the site visit in Aylesbury free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.
Can I see the design in 3D?
Yes; we produce simple 3D views so you can judge the size and light.
Do you handle building control in Aylesbury?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
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.