East Molesey, Surrey
Semi-detached rear extension in East Molesey
We plan and build rear extensions for semi-detached houses for homeowners in East Molesey. Single or two-storey extensions for semi-detached houses, with side access and one party wall. Start with a free site visit, then a written price once the design is agreed.
East Molesey and its postcode districts KT7, KT8 and KT10 are part of our Surrey coverage. In East Molesey we measure the attached neighbour's extension at the survey, because it often sets the sensible depth for yours.
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 semi-detached rear extension cost in East Molesey?
A semi-detached rear extension in East Molesey is priced at £2,130–£3,470 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a semi-detached rear extension in East Molesey?
Here is how the rules in England apply to a semi-detached rear extension in East Molesey.
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'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.
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 East Molesey like to extend?
Commuter semis and detached houses make up much of East Molesey, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a semi-detached rear extension in East Molesey 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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.
Semi-detached rear extensions near East Molesey
Neighbouring places we cover include Hampton (1.3 miles) and West Molesey (1.3 miles).
- Semi-detached rear extension in Hampton
- Semi-detached rear extension in West Molesey
- Semi-detached rear extension in Hampton Wick
- Semi-detached rear extension in Esher
- Semi-detached rear extension in Surbiton
Other work in East Molesey:
FAQ
Semi-detached rear extension questions in East Molesey
What postcode areas do you cover around East Molesey?
Including KT7, KT8 and KT10, and the surrounding Surrey area.
Do I need planning permission for a rear extension in East Molesey?
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.
How long does a semi extension take?
10 to 16 weeks on site for a single-storey extension.
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.
Is the site visit in East Molesey free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.