Thornaby-on-Tees, North Yorkshire
Glazed rear extension in Thornaby-on-Tees
Full-height glass, slim frames and big rooflights for the most open rear room. We design, get the approvals for and build glazed and glass-box rear extensions in Thornaby-on-Tees and the surrounding area, with one contract from the first survey to building control sign-off.
We cover Thornaby-on-Tees (TS16, TS17 and TS18) as part of our North Yorkshire work. A wide sliding door with one long rooflight, rather than a fully glazed roof, keeps a glass-led extension usable in summer.
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 Thornaby-on-Tees?
Guide prices for a glazed rear extension in Thornaby-on-Tees start from our North East England rate of £2,520–£4,320 per square metre, including VAT. 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 |
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 glazed rear extension in Thornaby-on-Tees?
The planning route for a glazed rear extension in Thornaby-on-Tees is set by England's householder rules and your council.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part 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 Thornaby-on-Tees like to extend?
Brick terraces, colliery houses and post-war semis make up much of Thornaby-on-Tees. Former mining areas often need a coal mining risk check before foundations are designed.
How a glazed rear extension in Thornaby-on-Tees 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.
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.
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 Thornaby-on-Tees
We also build glazed and glass-box rear extensions in nearby Ingleby Barwick (1.0 miles) and Stockton-on-Tees (2.5 miles).
- Glazed rear extension in Ingleby Barwick
- Glazed rear extension in Stockton-on-Tees
- Glazed rear extension in Yarm
- Glazed rear extension in Billingham
- Glazed rear extension in Middlesbrough
Other work in Thornaby-on-Tees:
FAQ
Glazed rear extension questions in Thornaby-on-Tees
Do I need planning permission for a rear extension in Thornaby-on-Tees?
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.
Is the site visit in Thornaby-on-Tees free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Is a glass box a conservatory?
No. It is built to Building Regulations as part of the house, with insulated floor and roof, so it is usable all year.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
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.
How long does a rear extension take to build in Thornaby-on-Tees?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.