Building services in Blackburn
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 Blackburn
| Project | Guide range (inc VAT) |
|---|---|
| Double-storey extensions | £1,550–£2,350 per m² of floor area (both floors) |
| Kitchen extensions | £2,100–£3,200 per m² including a mid-range kitchen |
| Hip-to-gable loft conversions | £51,500–£73,500 for a hip-to-gable with rear dormer |
| Garage conversions | £17,000–£28,000 for a single integral garage |
| House renovations | £850–£1,700 per m² for a medium to full renovation |
| Orangeries | £2,250–£3,200 per m² of floor area |
Building costs in the North West run about 6% below the UK average, and the figures for Blackburn are adjusted to reflect that.
Planning permission in Blackburn
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 Blackburn
The North West has many brick terraces and inter-war semis, where kitchen extensions and dormer loft conversions add space without moving.
Projects in Blackburn (BB1) are surveyed in person before we quote, so the price reflects your actual property. Blackburn 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
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions from homeowners in Blackburn
How much does an extension cost in Blackburn?
A single-storey extension in Blackburn 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.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
Do you work in Blackburn?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Blackburn, including postcodes BB1.
How much does a loft conversion cost in Blackburn?
A rear dormer loft conversion in Blackburn typically costs £45,000–£64,000 for a typical rear dormer with en-suite, including VAT.
Do I need planning permission for an extension in Blackburn?
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.