Darlington, County Durham
Glazed rear extension in Darlington
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Darlington and want to know what a glazed rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Darlington is covered from our County Durham round, including DL1, DL2 and DL3. If your garden in Darlington faces south, expect us to talk about overhangs and solar-control glass before frame colours.
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 glazed rear extension cost in Darlington?
In Darlington, our guide for a glazed rear extension is £2,520–£4,320 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 wide × 4 m deep (12 m²) | £30,000–£52,000 |
| 4 m wide × 6 m deep (24 m²) | £60,500–£103,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a glazed rear extension in Darlington?
Whether your glazed rear extension in Darlington needs a planning application depends on its size, your house and any local restrictions.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
New fabric must meet Approved Document L (2021 edition incorporating 2023 amendments): walls 0.18, roof 0.15 and floor 0.18 W/m²K, windows 1.4 W/m²K or Band B. Under the simple route, new windows, doors and rooflights should not exceed 25% of the extension floor area plus any openings removed; more glass is possible with a whole-house calculation.
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. Glass-led rear extensions in Darlington are planned around which way the garden faces, because that decides the glass specification.
How a glazed rear extension in Darlington 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.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Glazed rear extensions near Darlington
We also build glazed and glass-box rear extensions in nearby Newton Aycliffe (6.6 miles) and Yarm (7.9 miles).
- Glazed rear extension in Newton Aycliffe
- Glazed rear extension in Yarm
- Glazed rear extension in Ingleby Barwick
- Glazed rear extension in Stockton-on-Tees
- Glazed rear extension in Thornaby-on-Tees
Other work in Darlington:
FAQ
Glazed rear extension questions in Darlington
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.
What postcode areas do you cover around Darlington?
Including DL1, DL2 and DL3, and the surrounding County Durham area.
Can I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
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.
How much does a glazed rear extension cost in Darlington?
As a guide, £2,520–£4,320 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £30,000–£52,000 at that rate. Your written price follows the survey.
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.