From £81,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SW20. No obligation free quotes...
From £81,424
Nouvell Decor is a trusted extension builder serving customers in SW20 and the surrounding area. Contact us to today to get a competitive quote for...
From £82,616
Over 20 years experience
Client focussed and driven
Personal planning and completion of work
Warranty ...
From £81,112
Trusted and professional extension builder in SW20. Experienced in all extension buildering work and keeping within budget and on quote. D Dan Cons...
From £81,424
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £81,144
ABC Building & Maintenance Contractors Ltd is a trusted extension builder serving customers in SW20 and the surrounding area. Contact us to today t...
From £81,184
Experienced extension builder ready to quote for your work. DIAL 1ST CONSTRUCTION LTD is the best extension builder in SW20. No obligation free quo...
From £81,160
Trusted and professional extension builder in SW20. Experienced in all extension buildering work and keeping within budget and on quote. PARKWAY MA...
From £81,432
Krystian Wojasiewicz is a trusted extension builder serving customers in SW20 and the surrounding area. Contact us to today to get a competitive qu...
From £81,248
C & A Contractors is a trusted extension builder serving customers in SW20 and the surrounding area. Contact us to today to get a competitive quote...

The cost of installing a swimming pool in SW20 ranges from £81,048 (J&J Building Solutions based in SW16) to £82,616 (GasHeat based in NW10), but the best way to get an idea of how much you'll spend is to get actual quotes.
Post your job on HaMuch now and we'll put you in touch with extension builders in SW20.
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 - £17,879

Two storey extension - £88,569

Build a timber frame extension - £26,379

Build a swimming pool - £81,379

Single storey extension - £62,584

Side return extension - £45,766

Install an RSJ - £2,579

Outbuilding - £10,379

Build a Mansard loft conversion - £52,379

Loft conversion - £37,305

Build a kitchen extension - £42,379

Hip to gable loft conversion - £42,379

Granny annexe - £87,379

Garden office - £10,379

Convert a Garage - £16,379

Garage - £18,879

Build a flat roof extension - £22,379

Build a dormer loft conversion - £42,379

Concrete foundations - £6,629

Convert a bungalow loft - £29,379

Convert a basement - £41,766