Sunbury-on-Thames, Surrey
Two-storey rear extension in Sunbury-on-Thames
For homes in Sunbury-on-Thames, a two-storey rear extension is often the simplest way to gain space without moving. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We take it from survey to completion certificate.
Sunbury-on-Thames and its postcode districts KT12, TW16 and TW17 are part of our Surrey coverage. In Surrey we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
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 two-storey rear extension cost in Sunbury-on-Thames?
Guide prices for a two-storey rear extension in Sunbury-on-Thames start from our South East England rate of £2,020–£3,020 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 × 5 m footprint, two floors (30 m²) | £60,500–£90,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £97,000–£145,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in Sunbury-on-Thames?
Whether your two-storey rear extension in Sunbury-on-Thames needs a planning application depends on its size, your house and any local restrictions.
England's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
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?
Sunbury-on-Thames has a mix of Victorian terraces near the centre and larger Edwardian and inter-war houses further out. Clay soils across much of the South East mean deeper foundations near trees, which we plan for at the survey.
How a two-storey 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
Two-storey rear extensions near Sunbury-on-Thames
Neighbouring places we cover include Walton-on-Thames (1.2 miles) and Shepperton (1.5 miles).
- Two-storey rear extension in Walton-on-Thames
- Two-storey rear extension in Shepperton
- Two-storey rear extension in West Molesey
- Two-storey rear extension in Hampton
- Two-storey rear extension in Hanworth
Other work in Sunbury-on-Thames:
FAQ
Two-storey 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.
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.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
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.
How much does a two-storey rear extension cost in Sunbury-on-Thames?
As a guide, £2,020–£3,020 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £60,500–£90,500 at that rate. Your written price follows the survey.
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.