Northumberland Park, Greater London
Glazed rear extension in Northumberland Park
For homes in Northumberland Park, a glazed rear extension is often the simplest way to gain space without moving. Full-height glass, slim frames and big rooflights for the most open rear room. We take it from survey to completion certificate.
Northumberland Park and its postcode districts N9, N17 and N18 are part of our Greater London coverage. If your garden in Northumberland Park 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 Northumberland Park?
A glazed rear extension in Northumberland Park is priced at £3,640–£6,240 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a glazed rear extension in Northumberland Park?
The planning route for a glazed rear extension in Northumberland Park is set by England's householder rules and your council.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part 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 Northumberland Park like to extend?
Period terraces in Northumberland Park 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 Northumberland Park 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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 Northumberland Park
From Northumberland Park, the nearest places we also cover are Tottenham (0.4 miles) and Tottenham Hale (0.7 miles).
- Glazed rear extension in Tottenham
- Glazed rear extension in Tottenham Hale
- Glazed rear extension in Edmonton
- Glazed rear extension in Walthamstow
- Glazed rear extension in Southgate
Other work in Northumberland Park:
FAQ
Glazed rear extension questions in Northumberland Park
What postcode areas do you cover around Northumberland Park?
Including N9, N17 and N18, and the surrounding Greater London area.
Can you match the brick or stone on my Northumberland Park house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
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.
How much does a glazed rear extension cost in Northumberland Park?
As a guide, £3,640–£6,240 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £43,500–£75,000 at that rate. Your written price follows the survey.
Do you handle building control in Northumberland Park?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.