Windsor, Berkshire
Bungalow rear extension in Windsor
We plan and build rear extensions for bungalows for homeowners in Windsor. Single-storey rear extensions that keep everything on one level. Start with a free site visit, then a written price once the design is agreed.
Windsor sits in Berkshire, with postcode districts including SL4. For bungalows in Berkshire, a rear extension is the usual way to add space without adding stairs.
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 bungalow rear extension cost in Windsor?
For Windsor we work from the South East England rate: £2,070–£3,360 per square metre of new floor, including VAT, standard specification. 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) | £25,000–£40,500 |
| 4 m wide × 6 m deep (24 m²) | £49,500–£80,500 |
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 bungalow rear extension in Windsor?
Whether your bungalow rear extension in Windsor needs a planning application depends on its size, your house and any local restrictions.
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.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
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 Windsor like to extend?
Windsor has a mix of Victorian terraces near the centre and larger Edwardian and inter-war houses further out. Clay soils across much of the South East mean deeper foundations near trees, which we plan for at the survey.
How a bungalow rear extension in Windsor 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.
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.
Bungalow rear extensions near Windsor
Neighbouring places we cover include Slough (1.8 miles) and Egham (4.1 miles).
- Bungalow rear extension in Slough
- Bungalow rear extension in Egham
- Bungalow rear extension in Burnham
- Bungalow rear extension in Staines
- Bungalow rear extension in Stanwell
Other work in Windsor:
FAQ
Bungalow rear extension questions in Windsor
How long does a rear extension take to build in Windsor?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is the site visit in Windsor free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Is a bungalow extension cheaper?
The rates are similar per square metre; roof work can add a little.
How much does a bungalow rear extension cost in Windsor?
As a guide, £2,070–£3,360 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £25,000–£40,500 at that rate. Your written price follows the survey.
Do you handle building control in Windsor?
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 Windsor?
Including SL4, and the surrounding Berkshire area.