Marlow, Buckinghamshire
Two-storey rear extension in Marlow
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Marlow and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Marlow is covered from our Buckinghamshire round, including SL7. Two-storey rear extensions suit semi-detached houses in Marlow best, where the extra bedroom matters as much as the bigger kitchen.
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 Marlow?
Guide prices for a two-storey rear extension in Marlow 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 Marlow?
Here is how the rules in England apply to a two-storey rear extension in Marlow.
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. 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 Marlow like to extend?
Around Marlow 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 two-storey rear extension in Marlow 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.
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.
Two-storey rear extensions near Marlow
We also build two-storey rear extensions in nearby Maidenhead (4.0 miles) and High Wycombe (4.3 miles).
- Two-storey rear extension in Maidenhead
- Two-storey rear extension in High Wycombe
- Two-storey rear extension in Burnham
- Two-storey rear extension in Henley-on-Thames
- Two-storey rear extension in Beaconsfield
Other work in Marlow:
FAQ
Two-storey rear extension questions in Marlow
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 long does a rear extension take to build in Marlow?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
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 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.
What postcode areas do you cover around Marlow?
Including SL7, and the surrounding Buckinghamshire area.