Daventry, Northamptonshire
Kitchen-diner rear extension in Daventry
Kitchen-diner rear extension in Daventry: an open-plan kitchen, dining and family room that opens straight onto the garden. We measure the house, show you what the rules allow, price it in writing and build it.
Daventry and its postcode districts NN11 are part of our Northamptonshire coverage. For Daventry kitchens we plan the extraction route and the island drainage before the slab is poured, so nothing has to be chased in later.
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 kitchen-diner rear extension cost in Daventry?
In Daventry, our guide for a kitchen-diner rear extension is £1,840–£3,010 per square metre including VAT for a standard specification. East Midlands prices sit a little below our West Midlands baseline.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £22,000–£36,000 |
| 4 m wide × 5 m deep (20 m²) | £37,000–£60,000 |
| 4 m wide × 6 m deep (24 m²) | £44,000–£72,000 |
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 kitchen-diner rear extension in Daventry?
The planning route for a kitchen-diner rear extension in Daventry is set by England's householder rules and your council.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
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 Daventry like to extend?
Red-brick terraces and semis are typical of Daventry. Coal-mining legacy areas in parts of the East Midlands can need a Coal Authority check before foundations are designed. A kitchen-diner is often the reason people in Daventry extend: the back kitchen in red-brick terraces and semis is rarely big enough for a table.
How a kitchen-diner rear extension in Daventry 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.
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.
Kitchen-diner rear extensions near Daventry
Close by, we work in Rugby, about 9.0 miles away, and Northampton, about 11.7 miles away.
- Kitchen-diner rear extension in Rugby
- Kitchen-diner rear extension in Northampton
- Kitchen-diner rear extension in Royal Leamington Spa
- Kitchen-diner rear extension in Banbury
- Kitchen-diner rear extension in Brackley
Other work in Daventry:
FAQ
Kitchen-diner rear extension questions in Daventry
Do I need planning permission for a rear extension in Daventry?
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 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.
Can I have underfloor heating?
Yes. Wet underfloor heating in the new screed is the usual choice, often with the old room's radiators kept or replaced.
What postcode areas do you cover around Daventry?
Including NN11, and the surrounding Northamptonshire area.
Do you handle building control in Daventry?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
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.