Building services in Cambridge
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 Cambridge
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £2,050–£3,050 per m² of floor area |
| Kitchen extensions | £2,400–£3,600 per m² including a mid-range kitchen |
| Dormer loft conversions | £51,000–£72,000 for a typical rear dormer with en-suite |
| Garage conversions | £19,000–£32,000 for a single integral garage |
| Structural alterations and knock-throughs | £4,750–£10,000 for a typical knock-through with steel beam |
| Porches | £7,000–£17,000 from a 3 m² porch to a small front extension |
We start from a UK-wide guide and adjust it for the East of England, where labour and materials are typically about 6% above average.
Planning permission in Cambridge
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 Cambridge
Across the East of England, 1930s and post-war semis, newer estates and rural cottages all feature, each with different extension and loft options.
Our Cambridge coverage includes postcode districts CB5, CB21, CB22 and CB23, and we also work in nearby places such as Newmarket, Ely and Huntingdon. Cambridge has a population of around 150,000.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Drawings and written quote
We prepare the design and give you a written, itemised quote with inclusions and exclusions.
- 03
Permissions sorted
Applications, building control and neighbour arrangements, all before the start date.
- 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 Cambridge
Do I need planning permission for an extension in Cambridge?
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 an extension cost in Cambridge?
A single-storey extension in Cambridge typically costs £2,050–£3,050 per m² of floor area, and a double-storey extension £1,750–£2,650 per m² of floor area (both floors), including VAT.
Do you work in Cambridge?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Cambridge, including postcodes CB5, CB21, CB22 and CB23.
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 a loft conversion cost in Cambridge?
A rear dormer loft conversion in Cambridge typically costs £51,000–£72,000 for a typical rear dormer with en-suite, including VAT.