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Select your affordable KT20 extension builder
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in KT20. Experienced in all extension buildering work and keeping within budget and on quote. D B Jones ...
From £42,224
David Hunt
Kingswood, KT20
Relax... you have found a reliable extension builder in KT20. Cannon Gardens is a friendly and reliable company based in KT20 who consider no job a...
From £41,904
Experienced extension builder ready to quote for your work. Able Construction T/A is the best extension builder in KT20. No obligation free quotes ...
From £42,096
Tadworth, KT20
Relax... you have found a reliable extension builder in KT20. MSI is a friendly and reliable company based in KT20 who consider no job as too big o...
From £42,880
Need an Extension Builder in KT20? London Bespoke Build has been helping local clients (10 mile radius) with their extension buildering jobs for ma...
From £41,968
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £42,464
Pawel Zajac
At PZ Refurbishment we offer all aspects of Building, Roofing, Electrical, Joinery, Plumbing, Heating and more. We can carry out a large variety of...
From £42,352
Tadworth, KT20
AG Design And Build Limited is an established extension buildering business in KT20. We come highly recommended and provide competitive quotes for ...
From £42,024
Our family-run building services company Building and Electricals Ltd has over 40 combined years of experience in the industry. We help customers i...

In KT20, prices for dormer loft conversions range from £41,904 (Able Construction T/A based in KT20) to £42,880 (London Bespoke Build based in KT20), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in KT20. Post your job on HaMuch now and we'll put you in touch with available extension builders.
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 - £17,721

Two storey extension - £88,331

Build a timber frame extension - £26,221

Build a swimming pool - £81,221

Single storey extension - £59,416

Side return extension - £43,984

Install an RSJ - £2,421

Outbuilding - £10,221

Build a Mansard loft conversion - £52,221

Loft conversion - £35,820

Build a kitchen extension - £42,221

Hip to gable loft conversion - £42,221

Granny annexe - £87,221

Garden office - £10,221

Convert a Garage - £16,221

Garage - £18,721

Build a flat roof extension - £22,221

Build a dormer loft conversion - £42,221

Concrete foundations - £6,471

Convert a bungalow loft - £29,221

Convert a basement - £39,984