Northampton, Northamptonshire
Wraparound extension in Northampton
An L-shaped extension that fills the side return and runs across the back. If you live in Northampton and want to know what a wraparound extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Northampton sits in Northamptonshire, with postcode districts including NN1, NN2, NN3 and NN4. Wraparound projects around Northampton often involve two neighbours, so we start the party wall conversations early.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a wraparound extension cost in Northampton?
Guide prices for a wraparound extension in Northampton start from our East Midlands rate of £2,130–£3,490 per square metre, including VAT. East Midlands prices sit a little below our West Midlands baseline.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £47,000–£77,000 |
| L-shaped, about 30 m² of new floor | £64,000–£105,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a wraparound extension in Northampton?
Planning for a wraparound extension in Northampton follows the English householder rules.
In England the side part of a side return or wraparound must meet the side-extension rules (one storey, under 4 metres high, no more than half the width of the original house), and those rights do not apply on designated land. Because a wraparound combines a side and a rear extension, many need householder planning permission.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
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 Northampton like to extend?
Northampton has plenty of inter-war semis and bungalows, and single-storey rear extensions suit both.
How a wraparound extension in Northampton 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.
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.
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.
Wraparound extensions near Northampton
Close by, we work in Wellingborough, about 8.8 miles away, and Daventry, about 11.7 miles away.
- Wraparound extension in Wellingborough
- Wraparound extension in Daventry
- Wraparound extension in Rushden
- Wraparound extension in Kettering
- Wraparound extension in Newport Pagnell
Other work in Northampton:
FAQ
Wraparound extension questions in Northampton
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 planning permission for a rear extension in Northampton?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Will it take a lot of garden?
Less than a deep rear extension of the same area, because part of the space comes from the side passage.
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 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.
Is the site visit in Northampton free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.