Seaham, County Durham
Glazed rear extension in Seaham
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Seaham 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.
We cover Seaham (SR7) as part of our County Durham work. If your garden in Seaham 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 Seaham?
A glazed rear extension in Seaham is priced at £2,520–£4,320 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 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 Seaham?
The planning route for a glazed rear extension in Seaham is set by England's householder rules and your council.
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. 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.
How a glazed rear extension in Seaham 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.
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 Seaham
We also build glazed and glass-box rear extensions in nearby Ryhope (2.4 miles) and Hetton-le-Hole (4.4 miles).
- Glazed rear extension in Ryhope
- Glazed rear extension in Hetton-le-Hole
- Glazed rear extension in Houghton-le-Spring
- Glazed rear extension in Sunderland
- Glazed rear extension in Peterlee
Other work in Seaham:
FAQ
Glazed rear extension questions in Seaham
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.
Is the site visit in Seaham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
How long does a rear extension take to build in Seaham?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
What postcode areas do you cover around Seaham?
Including SR7, and the surrounding County Durham area.
Do I need planning permission for a rear extension in Seaham?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.