Croxley Green, Hertfordshire
Glazed rear extension in Croxley Green
Thinking about a glazed rear extension in Croxley Green? Full-height glass, slim frames and big rooflights for the most open rear room. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Croxley Green is covered from our Hertfordshire round, including WD1, WD3 and WD18. 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 Croxley Green?
A glazed rear extension in Croxley Green is priced at £2,970–£5,090 per square metre including VAT as a guide, before kitchen fit-out and fees. East of England prices run slightly above our West Midlands baseline; clay soils near trees are the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £35,500–£61,000 |
| 4 m wide × 6 m deep (24 m²) | £71,000–£122,000 |
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 Croxley Green?
Planning for a glazed rear extension in Croxley Green follows the English householder rules.
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 Croxley Green like to extend?
Croxley Green mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here. If your garden in Croxley Green faces south, expect us to talk about overhangs and solar-control glass before frame colours.
How a glazed rear extension in Croxley Green 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.
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.
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 Croxley Green
From Croxley Green, the nearest places we also cover are Batchworth (0.6 miles) and Rickmansworth (1.2 miles).
- Glazed rear extension in Batchworth
- Glazed rear extension in Rickmansworth
- Glazed rear extension in Northwood
- Glazed rear extension in West Watford
- Glazed rear extension in Watford
Other work in Croxley Green:
FAQ
Glazed rear extension questions in Croxley Green
Do you handle building control in Croxley Green?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Croxley Green free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
Can you match the brick or stone on my Croxley Green house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How long does a rear extension take to build in Croxley Green?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.