St Leonards-on-Sea, East Sussex
Kitchen-diner rear extension in St Leonards-on-Sea
An open-plan kitchen, dining and family room that opens straight onto the garden. If you live in St Leonards-on-Sea and want to know what a kitchen-diner rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
St Leonards-on-Sea and its postcode districts TN34, TN37 and TN38 are part of our East Sussex coverage. For St Leonards-on-Sea kitchens we plan the extraction route and the island drainage before the slab is poured, so nothing has to be chased in later.
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 kitchen-diner rear extension cost in St Leonards-on-Sea?
In St Leonards-on-Sea, our guide for a kitchen-diner rear extension is £2,130–£3,470 per square metre including VAT for a 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 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a kitchen-diner rear extension in St Leonards-on-Sea?
Whether your kitchen-diner rear extension in St Leonards-on-Sea needs a planning application depends on its size, your house and any local restrictions.
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 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 St Leonards-on-Sea like to extend?
Commuter semis and detached houses make up much of St Leonards-on-Sea, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a kitchen-diner rear extension in St Leonards-on-Sea 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.
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.
Kitchen-diner rear extensions near St Leonards-on-Sea
We also build kitchen-diner rear extensions in nearby Hastings (1.5 miles) and Bexhill-on-Sea (3.3 miles).
- Kitchen-diner rear extension in Hastings
- Kitchen-diner rear extension in Bexhill-on-Sea
- Kitchen-diner rear extension in Hailsham
- Kitchen-diner rear extension in Eastbourne
- Kitchen-diner rear extension in Seaford
Other work in St Leonards-on-Sea:
FAQ
Kitchen-diner rear extension questions in St Leonards-on-Sea
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.
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.
Do you fit the kitchen?
Yes, whether you buy it yourself or we supply it. We take the measurements from the built shell, not the drawings.
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.
What postcode areas do you cover around St Leonards-on-Sea?
Including TN34, TN37 and TN38, and the surrounding East Sussex area.
Is the site visit in St Leonards-on-Sea free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.