Sunbury-on-Thames, Surrey
Bungalow rear extension in Sunbury-on-Thames
Bungalow rear extension in Sunbury-on-Thames: single-storey rear extensions that keep everything on one level. We measure the house, show you what the rules allow, price it in writing and build it.
We cover Sunbury-on-Thames (KT12, TW16 and TW17) as part of our Surrey work. For bungalows in Surrey, a rear extension is the usual way to add space without adding stairs.
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 bungalow rear extension cost in Sunbury-on-Thames?
Guide prices for a bungalow rear extension in Sunbury-on-Thames start from our South East England rate of £2,070–£3,360 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) | £25,000–£40,500 |
| 4 m wide × 6 m deep (24 m²) | £49,500–£80,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a bungalow rear extension in Sunbury-on-Thames?
Planning for a bungalow rear extension in Sunbury-on-Thames follows the English householder rules.
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. 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 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 bungalow rear extension in Sunbury-on-Thames 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.
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.
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.
Bungalow rear extensions near Sunbury-on-Thames
From Sunbury-on-Thames, the nearest places we also cover are Walton-on-Thames (1.2 miles) and Shepperton (1.5 miles).
- Bungalow rear extension in Walton-on-Thames
- Bungalow rear extension in Shepperton
- Bungalow rear extension in West Molesey
- Bungalow rear extension in Hampton
- Bungalow rear extension in Hanworth
Other work in Sunbury-on-Thames:
FAQ
Bungalow rear extension questions in Sunbury-on-Thames
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.
Do I need to move out?
Rarely; the opening into the bungalow is made late in the build.
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.
What postcode areas do you cover around Sunbury-on-Thames?
Including KT12, TW16 and TW17, and the surrounding Surrey area.
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.