Didcot, Oxfordshire
Glazed rear extension in Didcot
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Didcot 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 Didcot (OX11) as part of our Oxfordshire work. If your garden in Didcot 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 Didcot?
A glazed rear extension in Didcot is priced at £3,140–£5,380 per square metre including VAT as a guide, before kitchen fit-out and fees. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £37,500–£64,500 |
| 4 m wide × 6 m deep (24 m²) | £75,500–£129,000 |
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 Didcot?
Here is how the rules in England apply to a glazed rear extension in Didcot.
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 Didcot like to extend?
Commuter semis and detached houses make up much of Didcot, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a glazed rear extension in Didcot 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.
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 Didcot
Close by, we work in Abingdon, about 4.6 miles away, and Wallingford, about 5.1 miles away.
- Glazed rear extension in Abingdon
- Glazed rear extension in Wallingford
- Glazed rear extension in Wantage
- Glazed rear extension in Cowley
- Glazed rear extension in Oxford
Other work in Didcot:
FAQ
Glazed rear extension questions in Didcot
How long does a rear extension take to build in Didcot?
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 planning permission for a rear extension in Didcot?
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.
Does glass need planning permission?
The same rules apply as any rear extension; glass does not change the depth or height limits.
Is the site visit in Didcot free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How much does a glazed rear extension cost in Didcot?
As a guide, £3,140–£5,380 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £37,500–£64,500 at that rate. Your written price follows the survey.
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.