Building services in Windsor
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Windsor
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £2,200–£3,250 per m² of floor area |
| Hip-to-gable loft conversions | £61,500–£87,500 for a hip-to-gable with rear dormer |
| Garage conversions | £20,000–£33,500 for a single integral garage |
| House renovations | £1,000–£2,000 per m² for a medium to full renovation |
| Structural alterations and knock-throughs | £5,000–£10,500 for a typical knock-through with steel beam |
| Orangeries | £2,700–£3,800 per m² of floor area |
That range is adjusted for the South East, where domestic building work typically costs around 12% above the national average.
Planning permission in Windsor
In England a single-storey rear extension is often permitted development: broadly up to 3 metres deep on a semi-detached or terraced house and 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary, and covering no more than half the garden. The larger home extension scheme allows up to 6 or 8 metres if you notify the council first and neighbours have a chance to comment. In conservation areas, National Parks and National Landscapes the larger home extension route, side extensions and cladding are not permitted development. Flats and houses whose rights have been removed need a planning application, and listed buildings need listed building consent.
Building regulations approval comes from the council’s building control service or a registered building control approver. The work is inspected at key stages, such as foundations, drainage and insulation, and a completion certificate is issued at the end.
About building in Windsor
The South East has a broad mix of housing, from Victorian terraces in the towns to post-war semis and newer estates, so extension types vary street by street.
We work across Windsor and neighbouring areas such as Slough, Egham and Staines. Postcodes we cover in Windsor include SL4. Windsor has a population of around 32,000.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions from homeowners in Windsor
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
Do you work in Windsor?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Windsor, including postcodes SL4.
Do I need planning permission for an extension in Windsor?
In England a single-storey rear extension is often permitted development: broadly up to 3 metres deep on a semi-detached or terraced house and 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary, and covering no more than half the garden. The larger home extension scheme allows up to 6 or 8 metres if you notify the council first and neighbours have a chance to comment. In conservation areas, National Parks and National Landscapes the larger home extension route, side extensions and cladding are not permitted development. Flats and houses whose rights have been removed need a planning application, and listed buildings need listed building consent.
How much does a loft conversion cost in Windsor?
A rear dormer loft conversion in Windsor typically costs £54,000–£76,000 for a typical rear dormer with en-suite, including VAT.
How much does an extension cost in Windsor?
A single-storey extension in Windsor typically costs £2,200–£3,250 per m² of floor area, and a double-storey extension £1,850–£2,800 per m² of floor area (both floors), including VAT.