Seaham, County Durham
Bungalow rear extension in Seaham
Bungalow rear extension in Seaham: single-storey rear extensions that keep everything on one level. We measure the house, show you what the rules allow, price it in writing and build it.
Seaham sits in County Durham, with postcode districts including SR7. For bungalows in County Durham, a rear extension is the usual way to add space without adding stairs.
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 bungalow rear extension cost in Seaham?
A bungalow rear extension in Seaham is priced at £1,660–£2,700 per square metre including VAT as a guide, before kitchen fit-out and fees. North East prices are among the lowest in our range; former mining ground is the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £20,000–£32,500 |
| 4 m wide × 6 m deep (24 m²) | £40,000–£65,000 |
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 bungalow rear extension in Seaham?
The planning route for a bungalow rear extension in Seaham is set by England's householder rules and your council.
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. 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 Seaham like to extend?
Brick terraces, colliery houses and post-war semis make up much of Seaham. Former mining areas often need a coal mining risk check before foundations are designed. For Seaham bungalows we design the roof first, because the low eaves decide the height of the new room.
How a bungalow rear extension in Seaham 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.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Bungalow rear extensions near Seaham
From Seaham, the nearest places we also cover are Ryhope (2.4 miles) and Hetton-le-Hole (4.4 miles).
- Bungalow rear extension in Ryhope
- Bungalow rear extension in Hetton-le-Hole
- Bungalow rear extension in Houghton-le-Spring
- Bungalow rear extension in Sunderland
- Bungalow rear extension in Peterlee
Other work in Seaham:
FAQ
Bungalow rear extension questions in Seaham
Can you match the brick or stone on my Seaham house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How long does a rear extension take to build in Seaham?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Can a bungalow extension be fully accessible?
Yes: level thresholds, wider doors and a wet room are straightforward to design in.
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 Seaham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Seaham?
Including SR7, and the surrounding County Durham area.