Sunbury-on-Thames, Surrey
Kitchen-diner rear extension in Sunbury-on-Thames
An open-plan kitchen, dining and family room that opens straight onto the garden. We design, get the approvals for and build kitchen-diner rear extensions in Sunbury-on-Thames and the surrounding area, with one contract from the first survey to building control sign-off.
Sunbury-on-Thames is covered from our Surrey round, including KT12, TW16 and TW17. A kitchen-diner is often the reason people in Sunbury-on-Thames 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 Sunbury-on-Thames?
Guide prices for a kitchen-diner rear extension in Sunbury-on-Thames start from our South East England rate of £2,130–£3,470 per square metre, including VAT. 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 Sunbury-on-Thames?
Whether your kitchen-diner rear extension in Sunbury-on-Thames needs a planning application depends on its size, your house and any local restrictions.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part 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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Sunbury-on-Thames like to extend?
Around Sunbury-on-Thames 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 Sunbury-on-Thames 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.
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 Sunbury-on-Thames
Close by, we work in Walton-on-Thames, about 1.2 miles away, and Shepperton, about 1.5 miles away.
- Kitchen-diner rear extension in Walton-on-Thames
- Kitchen-diner rear extension in Shepperton
- Kitchen-diner rear extension in West Molesey
- Kitchen-diner rear extension in Hampton
- Kitchen-diner rear extension in Hanworth
Other work in Sunbury-on-Thames:
FAQ
Kitchen-diner rear extension questions in Sunbury-on-Thames
Is the site visit in Sunbury-on-Thames free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Sunbury-on-Thames?
Including KT12, TW16 and TW17, and the surrounding Surrey area.
Where does the cooker extraction go?
Through the new wall or roof, ducted to outside. Recirculating hoods are possible but less effective.
Can you match the brick or stone on my Sunbury-on-Thames house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do I need planning permission for a rear extension in Sunbury-on-Thames?
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.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.