Washington, Tyne and Wear
Glazed rear extension in Washington
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Washington 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.
Washington is covered from our Tyne and Wear round, including NE37 and NE38. If your garden in Washington 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 Washington?
In Washington, 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a glazed rear extension in Washington?
Whether your glazed rear extension in Washington needs a planning application depends on its size, your house and any local restrictions.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres 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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Washington like to extend?
Terraces and semis are typical around Washington. 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 Washington 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.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Glazed rear extensions near Washington
From Washington, the nearest places we also cover are Chester-le-Street (3.7 miles) and The Boldons (3.9 miles).
- Glazed rear extension in Chester-le-Street
- Glazed rear extension in The Boldons
- Glazed rear extension in Felling
- Glazed rear extension in Houghton-le-Spring
- Glazed rear extension in Hebburn
Other work in Washington:
FAQ
Glazed rear extension questions in Washington
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
How much does a glazed rear extension cost in Washington?
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.
Will a glass extension be too hot?
Not if it is designed for its orientation, with solar-control glass, shading and ventilation.
How long does a rear extension take to build in Washington?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is the site visit in Washington free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Washington house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.