Durham, County Durham
Glazed rear extension in Durham
We plan and build glazed and glass-box rear extensions for homeowners in Durham. Full-height glass, slim frames and big rooflights for the most open rear room. Start with a free site visit, then a written price once the design is agreed.
Durham and its postcode districts DH1 are part of our County Durham coverage. Glass-led rear extensions in Durham are planned around which way the garden faces, because that decides the glass specification.
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 Durham?
In Durham, 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 |
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 for a glazed rear extension in Durham?
Whether your glazed rear extension in Durham 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 Durham like to extend?
Brick terraces, colliery houses and post-war semis make up much of Durham. Former mining areas often need a coal mining risk check before foundations are designed.
How a glazed rear extension in Durham 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.
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.
Glazed rear extensions near Durham
From Durham, the nearest places we also cover are Spennymoor (5.5 miles) and Chester-le-Street (5.7 miles).
- Glazed rear extension in Spennymoor
- Glazed rear extension in Chester-le-Street
- Glazed rear extension in Hetton-le-Hole
- Glazed rear extension in Houghton-le-Spring
- Glazed rear extension in Stanley
Other work in Durham:
FAQ
Glazed rear extension questions in Durham
Is the site visit in Durham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Durham?
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 I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
Can you match the brick or stone on my Durham house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
What postcode areas do you cover around Durham?
Including DH1, and the surrounding County Durham area.
Do you handle building control in Durham?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.