Canonbury, Greater London
Rear extension planning drawings in Canonbury
We plan and build rear extensions for homeowners in Canonbury. Measured survey, design options, planning drawings and the application, handled for you. Start with a free site visit, then a written price once the design is agreed.
Canonbury is covered from our Greater London round, including E8, N1 and N5. For Canonbury homes we start with a measured survey, then draw options before anything is submitted.
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 Canonbury?
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 Canonbury?
The planning route for a rear extension in Canonbury 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 Canonbury like to extend?
Period terraces in Canonbury sit alongside flats, and the difference matters: houses usually keep permitted development rights, while flats and maisonettes need planning permission for any rear extension.
How a rear extension in Canonbury comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Rear extension planning drawings near Canonbury
From Canonbury, the nearest places we also cover are Highbury (0.6 miles) and Islington (0.7 miles).
- Rear extension planning drawings in Highbury
- Rear extension planning drawings in Islington
- Rear extension planning drawings in Barnsbury
- Rear extension planning drawings in Holloway
- Rear extension planning drawings in Bethnal Green
Other work in Canonbury:
FAQ
Rear extension planning drawings questions in Canonbury
Can you match the brick or stone on my Canonbury house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
Do I need an architect?
You need accurate drawings by someone who knows householder planning; we provide them.
How long does a rear extension take to build in Canonbury?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do you handle building control in Canonbury?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Canonbury free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.