Milton Keynes, Buckinghamshire
Kitchen-diner rear extension in Milton Keynes
An open-plan kitchen, dining and family room that opens straight onto the garden. If you live in Milton Keynes and want to know what a kitchen-diner rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Milton Keynes is covered from our Buckinghamshire round, including MK3, MK4, MK5 and MK6. A kitchen-diner is often the reason people in Milton Keynes extend: the back kitchen in inter-war semis and 1960s estates is rarely big enough for a table.
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 Milton Keynes?
In Milton Keynes, our guide for a kitchen-diner rear extension is £2,130–£3,470 per square metre including VAT for a standard specification. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £25,500–£41,500 |
| 4 m wide × 5 m deep (20 m²) | £42,500–£69,500 |
| 4 m wide × 6 m deep (24 m²) | £51,000–£83,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a kitchen-diner rear extension in Milton Keynes?
Whether your kitchen-diner rear extension in Milton Keynes needs a planning application depends on its size, your house and any local restrictions.
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.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
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 Milton Keynes like to extend?
Around Milton Keynes the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.
How a kitchen-diner rear extension in Milton Keynes 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
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.
Kitchen-diner rear extensions near Milton Keynes
From Milton Keynes, the nearest places we also cover are Newport Pagnell (3.5 miles) and Bletchley (3.5 miles).
- Kitchen-diner rear extension in Newport Pagnell
- Kitchen-diner rear extension in Bletchley
- Kitchen-diner rear extension in Leighton Buzzard
- Kitchen-diner rear extension in Buckingham
- Kitchen-diner rear extension in Ampthill
Other work in Milton Keynes:
FAQ
Kitchen-diner rear extension questions in Milton Keynes
Do you handle building control in Milton Keynes?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can you match the brick or stone on my Milton Keynes house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Where does the cooker extraction go?
Through the new wall or roof, ducted to outside. Recirculating hoods are possible but less effective.
What postcode areas do you cover around Milton Keynes?
Including MK3, MK4, MK5, MK6, MK10 and MK13, and the surrounding Buckinghamshire area.
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.
How much does a kitchen-diner rear extension cost in Milton Keynes?
As a guide, £2,130–£3,470 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £25,500–£41,500 at that rate. Your written price follows the survey.