Highgate, Greater London
Rear extension planning drawings in Highgate
Measured survey, design options, planning drawings and the application, handled for you. We design, get the approvals for and build rear extensions in Highgate and the surrounding area, with one contract from the first survey to building control sign-off.
We cover Highgate (N6, NW3 and NW5) as part of our Greater London work. Rear extension applications in Greater London 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 Highgate?
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. 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 rear extension in Highgate?
The planning route for a rear extension in Highgate 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 Highgate like to extend?
Period terraces in Highgate 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 Highgate comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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 Highgate
Close by, we work in Archway, about 1.1 miles away, and Belsize Park, about 1.4 miles away.
- Rear extension planning drawings in Archway
- Rear extension planning drawings in Belsize Park
- Rear extension planning drawings in Chalk Farm
- Rear extension planning drawings in Kilburn
- Rear extension planning drawings in Holloway
Other work in Highgate:
FAQ
Rear extension planning drawings questions in Highgate
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.
Is the site visit in Highgate free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do I need an architect?
You need accurate drawings by someone who knows householder planning; we provide them.
Do you handle building control in Highgate?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
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.
Can you match the brick or stone on my Highgate house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.