Kempston, Bedfordshire
Glazed rear extension in Kempston
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Kempston 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.
Kempston sits in Bedfordshire, with postcode districts including MK42. Glass-led rear extensions in Kempston 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 Kempston?
Guide prices for a glazed rear extension in Kempston 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 |
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 Kempston?
The planning route for a glazed rear extension in Kempston 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 Kempston like to extend?
Kempston mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here.
How a glazed rear extension in Kempston 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
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 Kempston
From Kempston, the nearest places we also cover are Kempston Hardwick (1.8 miles) and Bedford (1.9 miles).
- Glazed rear extension in Kempston Hardwick
- Glazed rear extension in Bedford
- Glazed rear extension in Ampthill
- Glazed rear extension in Flitwick
- Glazed rear extension in Sandy
Other work in Kempston:
FAQ
Glazed rear extension questions in Kempston
How long does a rear extension take to build in Kempston?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
Does glass need planning permission?
The same rules apply as any rear extension; glass does not change the depth or height limits.
Do you handle building control in Kempston?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
What postcode areas do you cover around Kempston?
Including MK42, and the surrounding Bedfordshire area.
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.