Seaham, County Durham
Two-storey rear extension in Seaham
For homes in Seaham, a two-storey rear extension is often the simplest way to gain space without moving. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We take it from survey to completion certificate.
We cover Seaham (SR7) as part of our County Durham work. Two-storey rear extensions suit semi-detached houses in Seaham best, where the extra bedroom matters as much as the bigger kitchen.
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 two-storey rear extension cost in Seaham?
For Seaham we work from the North East England rate: £1,620–£2,430 per square metre of new floor, including VAT, standard specification. 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 × 5 m footprint, two floors (30 m²) | £48,500–£73,000 |
| 4 m × 6 m footprint, two floors (48 m²) | £78,000–£116,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a two-storey rear extension in Seaham?
Whether your two-storey rear extension in Seaham needs a planning application depends on its size, your house and any local restrictions.
England's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
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 Seaham like to extend?
Terraces and semis are typical around Seaham. On terraces a single-storey rear extension across the back yard is usually the practical choice; semis often have room for more. In County Durham we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
How a two-storey rear extension in Seaham comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
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.
Two-storey rear extensions near Seaham
From Seaham, the nearest places we also cover are Ryhope (2.4 miles) and Hetton-le-Hole (4.4 miles).
- Two-storey rear extension in Ryhope
- Two-storey rear extension in Hetton-le-Hole
- Two-storey rear extension in Houghton-le-Spring
- Two-storey rear extension in Sunderland
- Two-storey rear extension in Peterlee
Other work in Seaham:
FAQ
Two-storey rear extension questions in Seaham
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.
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.
Can it be built on a terraced house?
Sometimes, but the upper floor is harder to get through planning on a terrace because of the effect on neighbours. A single-storey extension with a loft conversion is often an easier route.
What postcode areas do you cover around Seaham?
Including SR7, and the surrounding County Durham area.
Is the site visit in Seaham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Seaham?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.