Newmarket, Suffolk
Glazed rear extension in Newmarket
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Newmarket 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.
Newmarket sits in Suffolk, with postcode districts including CB8. Glass-led rear extensions in Newmarket 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 Newmarket?
Guide prices for a glazed rear extension in Newmarket start from our East of England rate of £2,970–£5,090 per square metre, including VAT. 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a glazed rear extension in Newmarket?
The planning route for a glazed rear extension in Newmarket 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 Newmarket like to extend?
Post-war semis and newer estates are typical of Newmarket, and many have room for a full-width extension. Shrinkable clay is common in the East of England, so foundations near trees and hedges are designed to NHBC-style depth guidance.
How a glazed rear extension in Newmarket 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.
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 Newmarket
We also build glazed and glass-box rear extensions in nearby Mildenhall (8.2 miles) and Haverhill (11.3 miles).
- Glazed rear extension in Mildenhall
- Glazed rear extension in Haverhill
- Glazed rear extension in Ely
- Glazed rear extension in Cambridge
- Glazed rear extension in Bury St Edmunds
Other work in Newmarket:
FAQ
Glazed rear extension questions in Newmarket
What postcode areas do you cover around Newmarket?
Including CB8, and the surrounding Suffolk area.
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.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
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 long does a rear extension take to build in Newmarket?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do you handle building control in Newmarket?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.