Ampthill, Bedfordshire
Glazed rear extension in Ampthill
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Ampthill 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 Ampthill (MK45) as part of our Bedfordshire work. Glass-led rear extensions in Ampthill 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 Ampthill?
Guide prices for a glazed rear extension in Ampthill 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 Ampthill?
The planning route for a glazed rear extension in Ampthill is set by England's householder rules and your council.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it 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 Ampthill like to extend?
Ampthill mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here.
How a glazed rear extension in Ampthill 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Glazed rear extensions near Ampthill
We also build glazed and glass-box rear extensions in nearby Flitwick (1.6 miles) and Kempston Hardwick (4.3 miles).
- Glazed rear extension in Flitwick
- Glazed rear extension in Kempston Hardwick
- Glazed rear extension in Kempston
- Glazed rear extension in Bedford
- Glazed rear extension in Henlow
Other work in Ampthill:
FAQ
Glazed rear extension questions in Ampthill
Do I need planning permission for a rear extension in Ampthill?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
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.
Can I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
Is the site visit in Ampthill free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Ampthill?
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 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.