Windsor, Berkshire
Terraced house rear extension in Windsor
Rear and side return extensions for terraces, with access through the house and two neighbours. We design, get the approvals for and build rear extensions for terraced houses in Windsor and the surrounding area, with one contract from the first survey to building control sign-off.
Windsor is covered from our Berkshire round, including SL4. On a Windsor terrace both neighbours usually need party wall notices or agreement, so we talk to them early.
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 terraced house rear extension cost in Windsor?
Guide prices for a terraced house rear extension in Windsor start from our South East England rate of £2,300–£3,700 per square metre, including VAT. 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 × 4.5 m deep (13.5 m²) | £31,000–£50,000 |
| 3 m wide × 6 m deep (18 m²) | £41,500–£66,500 |
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 terraced house rear extension in Windsor?
Planning for a terraced house rear extension in Windsor follows the English householder rules.
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.
The Party Wall etc. Act 1996 applies in England: you serve notice two months before work to a shared wall, and one month before digging foundations within 3 metres (or 6 metres for deeper foundations) of a neighbour's building. Neighbours can agree in writing; if they dissent, surveyors agree an award.
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?
Commuter semis and detached houses make up much of Windsor, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a terraced house rear extension in Windsor 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.
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.
Terraced house rear extensions near Windsor
Neighbouring places we cover include Slough (1.8 miles) and Egham (4.1 miles).
- Terraced house rear extension in Slough
- Terraced house rear extension in Egham
- Terraced house rear extension in Burnham
- Terraced house rear extension in Staines
- Terraced house rear extension in Stanwell
Other work in Windsor:
FAQ
Terraced house rear extension questions in Windsor
Is the site visit in Windsor free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Windsor?
Including SL4, and the surrounding Berkshire area.
How deep can I go on a terrace?
3 metres under permitted development in England, or up to 6 metres with prior approval outside designated land.
Can you match the brick or stone on my Windsor house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
How much does a terraced house rear extension cost in Windsor?
As a guide, £2,300–£3,700 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £31,000–£50,000 at that rate. Your written price follows the survey.