County Durham
Two-storey rear extensions in County Durham
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We design and build rear extensions across County Durham, from Darlington and Hartlepool to Stockton-on-Tees, covering single-storey kitchen extensions, two-storey additions, side returns and wraparounds.
In Darlington, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted. Brick terraces, colliery houses and post-war semis make up much of County Durham. Former mining areas often need a coal mining risk check before foundations are designed.
How much does a two-storey rear extension cost in County Durham?
A two-storey rear extension in County Durham is priced at £1,620–£2,430 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 × 5 m footprint, two floors (30 m²) | £48,500–£73,000 |
| 4 m × 6 m footprint, two floors (48 m²) | £78,000–£116,500 |
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 in County Durham?
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.
Where in County Durham do we work?
FAQ
Questions people ask
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
Is two-storey cheaper per square metre than single-storey?
Usually yes, because the foundations and roof are shared across twice the floor area. The total cost is higher.
Can I add an en-suite upstairs?
Yes. We plan the soil pipe route early so the bathroom sits where drainage works without boxing through the room below.
Do you cover all of County Durham?
We cover 16 towns and districts in County Durham, including Darlington, Hartlepool and Stockton-on-Tees.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.