Dorking, Surrey
Single-storey rear extension in Dorking
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Dorking and want to know what a single-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Dorking is covered from our Surrey round, including KT23 and RH4. A depth of 3 to 4 metres keeps many single-storey rear extensions in Dorking within permitted development, subject to the house's planning history.
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 single-storey rear extension cost in Dorking?
For Dorking we work from the South East England rate: £2,130–£3,470 per square metre of new floor, including VAT, standard specification. 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 single-storey rear extension in Dorking?
Here is how the rules in England apply to a single-storey rear extension in Dorking.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres 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. 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 Dorking like to extend?
Dorking 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 single-storey rear extension in Dorking 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.
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.
Single-storey rear extensions near Dorking
Close by, we work in Great Bookham, about 3.7 miles away, and Leatherhead, about 4.4 miles away.
- Single-storey rear extension in Great Bookham
- Single-storey rear extension in Leatherhead
- Single-storey rear extension in Ashtead
- Single-storey rear extension in Reigate
- Single-storey rear extension in Redhill
Other work in Dorking:
FAQ
Single-storey rear extension questions in Dorking
What postcode areas do you cover around Dorking?
Including KT23 and RH4, and the surrounding Surrey area.
Do I need planning permission for a rear extension in Dorking?
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.
Do I need a structural engineer?
Yes for the beam over the new opening and usually for the foundations. Their calculations go to building control with the drawings.
Is the site visit in Dorking free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Can you match the brick or stone on my Dorking house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.