Muswell Hill, Greater London
Glazed rear extension in Muswell Hill
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Muswell Hill 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.
Muswell Hill sits in Greater London, with postcode districts including N2, N8 and N10. Glass-led rear extensions in Muswell Hill are planned around which way the garden faces, because that decides the glass specification.
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 Muswell Hill?
For Muswell Hill we work from the London rate: £3,640–£6,240 per square metre of new floor, including VAT, standard specification. 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 Muswell Hill?
The planning route for a glazed rear extension in Muswell Hill is set by England's householder rules and your council.
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. 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 Muswell Hill like to extend?
Period terraces in Muswell Hill sit alongside flats, and the difference matters: houses usually keep permitted development rights, while flats and maisonettes need planning permission for any rear extension.
How a glazed rear extension in Muswell Hill 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
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 Muswell Hill
From Muswell Hill, the nearest places we also cover are Hornsey (0.9 miles) and Crouch End (1.1 miles).
- Glazed rear extension in Hornsey
- Glazed rear extension in Crouch End
- Glazed rear extension in Wood Green
- Glazed rear extension in Archway
- Glazed rear extension in Friern Barnet
Other work in Muswell Hill:
FAQ
Glazed rear extension questions in Muswell Hill
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
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.
Do you handle building control in Muswell Hill?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Muswell Hill free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.