Building services in Hammersmith
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 Hammersmith
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £2,550–£3,750 per m² of floor area |
| Double-storey extensions | £2,150–£3,250 per m² of floor area (both floors) |
| Hip-to-gable loft conversions | £71,500–£101,500 for a hip-to-gable with rear dormer |
| House renovations | £1,150–£2,350 per m² for a medium to full renovation |
| Porches | £8,500–£21,000 from a 3 m² porch to a small front extension |
| Orangeries | £3,100–£4,400 per m² of floor area |
Prices across London are typically 30% above the UK average for this kind of work, which is reflected in the range for Hammersmith.
Planning permission in Hammersmith
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 Hammersmith
Many London boroughs have conservation areas and detailed design guides, so early design advice saves time at the planning stage.
Projects in Hammersmith (W6 and W14) are surveyed in person before we quote, so the price reflects your actual property.
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
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
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions from homeowners in Hammersmith
How much does an extension cost in Hammersmith?
A single-storey extension in Hammersmith typically costs £2,550–£3,750 per m² of floor area, and a double-storey extension £2,150–£3,250 per m² of floor area (both floors), including VAT.
Do I need planning permission for an extension in Hammersmith?
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 Hammersmith?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Hammersmith, including postcodes W6 and W14.
How much does a loft conversion cost in Hammersmith?
A rear dormer loft conversion in Hammersmith typically costs £62,500–£88,500 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.