Margate, Kent
Semi-detached rear extension in Margate
Single or two-storey extensions for semi-detached houses, with side access and one party wall. We design, get the approvals for and build rear extensions for semi-detached houses in Margate and the surrounding area, with one contract from the first survey to building control sign-off.
Margate sits in Kent, with postcode districts including CT8, CT9 and CT11. In Margate 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 Margate?
For Margate 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 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a semi-detached rear extension in Margate?
The planning route for a semi-detached rear extension in Margate is set by England's householder rules and your council.
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.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
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 Margate like to extend?
Commuter semis and detached houses make up much of Margate, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a semi-detached rear extension in Margate 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 Margate
Close by, we work in Broadstairs, about 2.9 miles away, and Ramsgate, about 3.4 miles away.
- Semi-detached rear extension in Broadstairs
- Semi-detached rear extension in Ramsgate
- Semi-detached rear extension in Deal
- Semi-detached rear extension in Herne Bay
- Semi-detached rear extension in Canterbury
Other work in Margate:
FAQ
Semi-detached rear extension questions in Margate
Do you handle building control in Margate?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
What postcode areas do you cover around Margate?
Including CT8, CT9 and CT11, and the surrounding Kent area.
How long does a semi extension take?
10 to 16 weeks on site for a single-storey extension.
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.
Is the site visit in Margate free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Margate?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.