From £21,848
We offer Concept Design ideas for you to see what your room, house, office space can look like.
From £22,064
RJB Construction and Joinery is a trusted extension builder serving customers in LS21 and the surrounding area. Contact us to today to get a compet...

A flat roof extension ranges from the cheapest of £21,848 (CB Concept Design based in LS20) to the dearest of £22,064 (RJB Construction and Joinery based in LS20), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in LS21 by posting a job with HaMuch. We'll send it to extension builders in LS21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Shipley | £29 | £226 |
| Build A Flat Roof Extension near Pudsey | £30 | £226 |
| Build A Flat Roof Extension near Bingley | £30 | £228 |
| Build A Flat Roof Extension near Harrogate | £29 | £225 |
| Build A Flat Roof Extension near Bradford | £29 | £224 |
| Build A Flat Roof Extension near Chapeltown | £30 | £232 |
| Build A Flat Roof Extension near Leeds | £31 | £236 |
| Build A Flat Roof Extension near Keighley | £30 | £226 |
| Build A Flat Roof Extension near Beeston | £31 | £236 |
| Build A Flat Roof Extension near Morley | £31 | £239 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,456

Two storey extension - £87,934

Build a timber frame extension - £25,956

Build a swimming pool - £80,956

Single storey extension - £54,120

Side return extension - £41,005

Install an RSJ - £2,156

Outbuilding - £9,956

Build a Mansard loft conversion - £51,956

Loft conversion - £33,338

Build a kitchen extension - £41,956

Hip to gable loft conversion - £41,956

Granny annexe - £86,956

Garden office - £9,956

Convert a Garage - £15,956

Garage - £18,456

Build a flat roof extension - £21,956

Build a dormer loft conversion - £41,956

Concrete foundations - £6,206

Convert a bungalow loft - £28,956

Convert a basement - £37,005