Eastbourne, East Sussex
Single-storey rear extension in Eastbourne
Single-storey rear extension in Eastbourne: ground-floor space across the back of the house, usually for a kitchen, dining or family room. We measure the house, show you what the rules allow, price it in writing and build it.
Eastbourne and its postcode districts BN20, BN21 and BN23 are part of our East Sussex coverage. A single-storey rear extension in Eastbourne is mostly built from the garden side, so the house stays usable for most of the job.
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 Eastbourne?
A single-storey rear extension in Eastbourne 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Eastbourne?
Whether your single-storey rear extension in Eastbourne needs a planning application depends on its size, your house and any local restrictions.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is 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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Eastbourne like to extend?
Commuter semis and detached houses make up much of Eastbourne, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a single-storey rear extension in Eastbourne comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
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.
Single-storey rear extensions near Eastbourne
We also build single-storey rear extensions in nearby Hailsham (6.6 miles) and Seaford (7.9 miles).
- Single-storey rear extension in Hailsham
- Single-storey rear extension in Seaford
- Single-storey rear extension in Bexhill-on-Sea
- Single-storey rear extension in Newhaven
- Single-storey rear extension in Peacehaven
Other work in Eastbourne:
FAQ
Single-storey rear extension questions in Eastbourne
Do I need planning permission for a rear extension in Eastbourne?
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.
Can you match the brick or stone on my Eastbourne house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
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.
Do you handle building control in Eastbourne?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Eastbourne free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.