Headstone, Greater London
Glazed rear extension in Headstone
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Headstone 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.
We cover Headstone (HA1, HA2 and HA3) as part of our Greater London 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 Headstone?
Guide prices for a glazed rear extension in Headstone start from our London rate of £3,640–£6,240 per square metre, including VAT. London prices sit at the top of our range because of labour rates, access through the house, parking suspensions and skip licences.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £43,500–£75,000 |
| 4 m wide × 6 m deep (24 m²) | £87,500–£150,000 |
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 Headstone?
Here is how the rules in England apply to a glazed rear extension in Headstone.
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 Headstone like to extend?
Much of Headstone is 1920s and 1930s semis and short terraces with longer gardens than inner London, which suit full-width single-storey rear extensions. Parking suspensions, skip licences and controlled hours on residential streets shape the programme more than the build itself.
How a glazed rear extension in Headstone 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.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Glazed rear extensions near Headstone
From Headstone, the nearest places we also cover are Wealdstone (0.6 miles) and Harrow (1.1 miles).
- Glazed rear extension in Wealdstone
- Glazed rear extension in Harrow
- Glazed rear extension in Harrow Weald
- Glazed rear extension in Harrow on the Hill
- Glazed rear extension in Pinner
Other work in Headstone:
FAQ
Glazed rear extension questions in Headstone
What postcode areas do you cover around Headstone?
Including HA1, HA2 and HA3, and the surrounding Greater London area.
Is the site visit in Headstone free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Is there a limit on how much glass I can have?
In England the simple rule is 25% of the floor area plus openings removed; more is allowed with a calculation showing the house still meets Part L.
Do I need planning permission for a rear extension in Headstone?
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.
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.
Can you match the brick or stone on my Headstone house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.