Darlington, County Durham
Two-storey rear extension in Darlington
Thinking about a two-storey rear extension in Darlington? A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
We cover Darlington (DL1, DL2 and DL3) as part of our County Durham work. In County Durham we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
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 Darlington?
In Darlington, our guide for a two-storey rear extension is £1,620–£2,430 per square metre including VAT for a 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 |
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 two-storey rear extension in Darlington?
Here is how the rules in England apply to a two-storey rear extension in Darlington.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
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 Darlington like to extend?
Terraces and semis are typical around Darlington. On terraces a single-storey rear extension across the back yard is usually the practical choice; semis often have room for more.
How a two-storey rear extension in Darlington 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
Two-storey rear extensions near Darlington
Neighbouring places we cover include Newton Aycliffe (6.6 miles) and Yarm (7.9 miles).
- Two-storey rear extension in Newton Aycliffe
- Two-storey rear extension in Yarm
- Two-storey rear extension in Ingleby Barwick
- Two-storey rear extension in Stockton-on-Tees
- Two-storey rear extension in Thornaby-on-Tees
Other work in Darlington:
FAQ
Two-storey rear extension questions in Darlington
What postcode areas do you cover around Darlington?
Including DL1, DL2 and DL3, and the surrounding County Durham area.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
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.
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.
Do you handle building control in Darlington?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
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.