Building services in Darwen
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 Darwen
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £1,850–£2,750 per m² of floor area |
| Kitchen extensions | £2,100–£3,200 per m² including a mid-range kitchen |
| Dormer loft conversions | £45,000–£64,000 for a typical rear dormer with en-suite |
| Hip-to-gable loft conversions | £51,500–£73,500 for a hip-to-gable with rear dormer |
| Structural alterations and knock-throughs | £4,250–£9,000 for a typical knock-through with steel beam |
| Porches | £6,000–£15,000 from a 3 m² porch to a small front extension |
Prices across the North West are typically 6% below the UK average for this kind of work, which is reflected in the range for Darwen.
Planning permission in Darwen
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 Darwen
Terraced streets across the North West often suit rear dormers and single-storey kitchen extensions.
If your home is in Darwen or close by in Blackburn, Accrington and Chorley, a free home visit is the first step. Darwen has a population of around 33,000.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 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
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions from homeowners in Darwen
Do you work in Darwen?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Darwen, including postcodes BB3.
How much does an extension cost in Darwen?
A single-storey extension in Darwen typically costs £1,850–£2,750 per m² of floor area, and a double-storey extension £1,550–£2,350 per m² of floor area (both floors), including VAT.
Do I need planning permission for an extension in Darwen?
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 Darwen?
A rear dormer loft conversion in Darwen typically costs £45,000–£64,000 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.