Swindon, Wiltshire
Glazed rear extension in Swindon
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Swindon 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.
Swindon is covered from our Wiltshire round, including SN2, SN3, SN4 and SN5. If your garden in Swindon 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 Swindon?
Guide prices for a glazed rear extension in Swindon start from our South West England rate of £2,910–£4,990 per square metre, including VAT. South West prices run slightly above our West Midlands baseline; natural stone to match the house is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £35,000–£60,000 |
| 4 m wide × 6 m deep (24 m²) | £70,000–£120,000 |
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 Swindon?
The planning route for a glazed rear extension in Swindon 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. 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 Swindon like to extend?
Swindon has Victorian terraces nearer the centre and post-war semis on the edges. Sloping gardens are frequent, which affects floor levels and steps down to the patio.
How a glazed rear extension in Swindon 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
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 Swindon
We also build glazed and glass-box rear extensions in nearby Royal Wootton Bassett (5.4 miles) and Calne (12.7 miles).
- Glazed rear extension in Royal Wootton Bassett
- Glazed rear extension in Calne
- Glazed rear extension in Cirencester
- Glazed rear extension in Wantage
- Glazed rear extension in Carterton
Other work in Swindon:
FAQ
Glazed rear extension questions in Swindon
How much does a glazed rear extension cost in Swindon?
As a guide, £2,910–£4,990 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £35,000–£60,000 at that rate. Your written price follows the survey.
Can you match the brick or stone on my Swindon house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Will a glass extension be too hot?
Not if it is designed for its orientation, with solar-control glass, shading and ventilation.
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.
Is the site visit in Swindon free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Swindon?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.