Building services in Sunbury-on-Thames
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 Sunbury-on-Thames
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £2,200–£3,250 per m² of floor area |
| Double-storey extensions | £1,850–£2,800 per m² of floor area (both floors) |
| 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 |
| Structural alterations and knock-throughs | £5,000–£10,500 for a typical knock-through with steel beam |
| Porches | £7,250–£18,000 from a 3 m² porch to a small front extension |
We start from a UK-wide guide and adjust it for the South East, where labour and materials are typically about 12% above average.
Planning permission in Sunbury-on-Thames
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 Sunbury-on-Thames
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.
Projects in Sunbury-on-Thames (KT12 and TW16) are surveyed in person before we quote, so the price reflects your actual property. Sunbury-on-Thames has a population of around 28,000.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Permissions sorted
Applications, building control and neighbour arrangements, all before the start date.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions from homeowners in Sunbury-on-Thames
How much does a loft conversion cost in Sunbury-on-Thames?
A rear dormer loft conversion in Sunbury-on-Thames typically costs £54,000–£76,000 for a typical rear dormer with en-suite, including VAT.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
How much does an extension cost in Sunbury-on-Thames?
A single-storey extension in Sunbury-on-Thames 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.
Do I need planning permission for an extension in Sunbury-on-Thames?
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.
Do you work in Sunbury-on-Thames?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Sunbury-on-Thames, including postcodes KT12 and TW16.