Brighton, East Sussex
Glazed rear extension in Brighton
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Brighton 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.
Brighton and its postcode districts BN1, BN2, BN3 and BN41 are part of our East Sussex coverage. If your garden in Brighton 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 Brighton?
For Brighton we work from the South East England rate: £3,140–£5,380 per square metre of new floor, including VAT, standard specification. 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 Brighton?
Planning for a glazed rear extension in Brighton follows the English householder rules.
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 Brighton like to extend?
Commuter semis and detached houses make up much of Brighton, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a glazed rear extension in Brighton 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.
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 Brighton
Neighbouring places we cover include Hove (1.2 miles) and Portslade (3.5 miles).
- Glazed rear extension in Hove
- Glazed rear extension in Portslade
- Glazed rear extension in Rottingdean
- Glazed rear extension in Shoreham-by-Sea
- Glazed rear extension in Peacehaven
Other work in Brighton:
FAQ
Glazed rear extension questions in Brighton
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.
What postcode areas do you cover around Brighton?
Including BN1, BN2, BN3 and BN41, and the surrounding East Sussex area.
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.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
How much does a glazed rear extension cost in Brighton?
As a guide, £3,140–£5,380 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £37,500–£64,500 at that rate. Your written price follows the survey.
Do you handle building control in Brighton?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.