Weston-super-Mare, Somerset
Rear extension planning drawings in Weston-super-Mare
Measured survey, design options, planning drawings and the application, handled for you. If you live in Weston-super-Mare and want to know what a rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Weston-super-Mare and its postcode districts BS22 and BS23 are part of our Somerset coverage. Planning applications in Weston-super-Mare go to the local planning authority covering Weston-super-Mare, and we check its local design guidance for rear extensions before drawing.
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 Weston-super-Mare?
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. These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a rear extension in Weston-super-Mare?
The planning route for a rear extension in Weston-super-Mare 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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Weston-super-Mare like to extend?
Weston-super-Mare has Victorian terraces nearer the centre and post-war semis on the edges. Sloping gardens are frequent, which affects floor levels and steps down to the patio.
How a rear extension in Weston-super-Mare 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Rear extension planning drawings near Weston-super-Mare
We also build rear extensions in nearby Yatton (7.2 miles) and Burnham-on-Sea (7.5 miles).
- Rear extension planning drawings in Yatton
- Rear extension planning drawings in Burnham-on-Sea
- Rear extension planning drawings in Clevedon
- Rear extension planning drawings in Penarth
- Rear extension planning drawings in Nailsea
Other work in Weston-super-Mare:
FAQ
Rear extension planning drawings questions in Weston-super-Mare
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.
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.
Do neighbours get consulted?
Yes for a full application: the council writes to them or puts up a site notice.
How long does a rear extension take to build in Weston-super-Mare?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
What do rear extension planning drawings cost in Weston-super-Mare?
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.
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.