Shoreham-by-Sea, West Sussex
Single-storey rear extension in Shoreham-by-Sea
Thinking about a single-storey rear extension in Shoreham-by-Sea? Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Shoreham-by-Sea is covered from our West Sussex round, including BN42 and BN43. On inter-war semis and 1960s estates like those around Shoreham-by-Sea, a single-storey rear extension is usually the simplest way to fix a small back kitchen without touching the bedrooms.
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 Shoreham-by-Sea?
A single-storey rear extension in Shoreham-by-Sea 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 |
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 single-storey rear extension in Shoreham-by-Sea?
Whether your single-storey rear extension in Shoreham-by-Sea needs a planning application depends on its size, your house and any local restrictions.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Shoreham-by-Sea like to extend?
Around Shoreham-by-Sea 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 single-storey rear extension in Shoreham-by-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.
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.
Single-storey rear extensions near Shoreham-by-Sea
Neighbouring places we cover include Lancing (2.1 miles) and Portslade (2.6 miles).
- Single-storey rear extension in Lancing
- Single-storey rear extension in Portslade
- Single-storey rear extension in Worthing
- Single-storey rear extension in Hove
- Single-storey rear extension in Brighton
Other work in Shoreham-by-Sea:
FAQ
Single-storey rear extension questions in Shoreham-by-Sea
What postcode areas do you cover around Shoreham-by-Sea?
Including BN42 and BN43, and the surrounding West Sussex area.
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.
Does it add value to the house?
Nationwide's October 2025 house price research found that a 10% increase in floor area is linked to about 5% higher value on average. It is a guide, not a promise; local agents can tell you what extended homes on your street sell for.
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 Shoreham-by-Sea free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Shoreham-by-Sea?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.