Building services in Keynsham
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 Keynsham
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £2,000–£2,950 per m² of floor area |
| Double-storey extensions | £1,700–£2,550 per m² of floor area (both floors) |
| Kitchen extensions | £2,300–£3,450 per m² including a mid-range kitchen |
| Dormer loft conversions | £49,000–£69,500 for a typical rear dormer with en-suite |
| Hip-to-gable loft conversions | £56,000–£79,500 for a hip-to-gable with rear dormer |
| House renovations | £900–£1,850 per m² for a medium to full renovation |
Prices in the South West sit near the national average for this kind of work, and the range for Keynsham reflects that.
Planning permission in Keynsham
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 Keynsham
The South West mixes stone and render cottages with post-war and newer estates, and local materials matter more here when matching an extension.
Our Keynsham coverage includes postcode districts BS30 and BS31, and we also work in nearby places such as Kingswood, Mangotsfield and Bath. Keynsham has a population of around 20,000.
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 pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 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 Keynsham
Do I need planning permission for an extension in Keynsham?
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.
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 Keynsham?
A single-storey extension in Keynsham typically costs £2,000–£2,950 per m² of floor area, and a double-storey extension £1,700–£2,550 per m² of floor area (both floors), including VAT.
Do you work in Keynsham?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Keynsham, including postcodes BS30 and BS31.
How much does a loft conversion cost in Keynsham?
A rear dormer loft conversion in Keynsham typically costs £49,000–£69,500 for a typical rear dormer with en-suite, including VAT.