Southampton, Hampshire
Glazed rear extension in Southampton
We plan and build glazed and glass-box rear extensions for homeowners in Southampton. 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.
We cover Southampton (SO14, SO15, SO16 and SO17) as part of our Hampshire work. If your garden in Southampton 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 Southampton?
Guide prices for a glazed rear extension in Southampton start from our South East England rate of £3,140–£5,380 per square metre, including VAT. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £37,500–£64,500 |
| 4 m wide × 6 m deep (24 m²) | £75,500–£129,000 |
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 Southampton?
The planning route for a glazed rear extension in Southampton 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. 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 Southampton like to extend?
Commuter semis and detached houses make up much of Southampton, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a glazed rear extension in Southampton comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
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.
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 Southampton
From Southampton, the nearest places we also cover are Woolston (1.4 miles) and Portswood (1.7 miles).
- Glazed rear extension in Woolston
- Glazed rear extension in Portswood
- Glazed rear extension in Hythe
- Glazed rear extension in Totton
- Glazed rear extension in Hedge End
Other work in Southampton:
FAQ
Glazed rear extension questions in Southampton
What postcode areas do you cover around Southampton?
Including SO14, SO15, SO16, SO17, SO18 and SO19, and the surrounding Hampshire area.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Does glass need planning permission?
The same rules apply as any rear extension; glass does not change the depth or height limits.
Do I need planning permission for a rear extension in Southampton?
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.
Do you handle building control in Southampton?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Southampton free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.