Northwich, Cheshire
Glazed rear extension in Northwich
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Northwich 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 Northwich (CW9) as part of our Cheshire work. If your garden in Northwich 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 Northwich?
A glazed rear extension in Northwich is priced at £2,630–£4,510 per square metre including VAT as a guide, before kitchen fit-out and fees. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £31,500–£54,000 |
| 4 m wide × 6 m deep (24 m²) | £63,000–£108,500 |
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 Northwich?
Here is how the rules in England apply to a glazed rear extension in Northwich.
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. 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 Northwich like to extend?
Stone and brick terraces are common around Northwich. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier. Glass-led rear extensions in Northwich are planned around which way the garden faces, because that decides the glass specification.
How a glazed rear extension in Northwich 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.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Glazed rear extensions near Northwich
Close by, we work in Winsford, about 4.7 miles away, and Middlewich, about 5.5 miles away.
- Glazed rear extension in Winsford
- Glazed rear extension in Middlewich
- Glazed rear extension in Knutsford
- Glazed rear extension in Lymm
- Glazed rear extension in Warrington
Other work in Northwich:
FAQ
Glazed rear extension questions in Northwich
What postcode areas do you cover around Northwich?
Including CW9, and the surrounding Cheshire area.
Is the site visit in Northwich 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 you handle building control in Northwich?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
How much does a glazed rear extension cost in Northwich?
As a guide, £2,630–£4,510 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £31,500–£54,000 at that rate. Your written price follows the survey.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.