From £37,500
Relax... you have found a reliable extension builder in Hayes. Millimetre HQR Limited is a friendly and reliable company based in Hayes who conside...
From £36,900
Hayes, UB3
Trusted and professional extension builder in Hayes. Experienced in all extension buildering work and keeping within budget and on quote. SME Build...
From £33,075
Need to find an Extension Builder near you for all your extension buildering work?
A S BUILDER provides a local, trusted extension builderi...
From £36,975
Hayes, UB3
Reliable construction and Joinery company with a track record of excellence. Skilled professionals delivering innovative solutions for over 20 year...
From £32,700
Nirvair Builders is an established extension buildering business in Hayes. We come highly recommended and provide competitive quotes for your work....
From £34,875
Hayes, UB3
Trusted and professional extension builder in Hayes. Experienced in all extension buildering work and keeping within budget and on quote. Elegance ...
From £36,600
Game Planner is a trusted extension builder serving customers in Hayes and the surrounding area. Contact us to today to get a competitive quote for...
From £36,375
Hayes Greater London, UB3
Need an Extension Builder in Hayes? Nexdat Ltd has been helping local clients (10 mile radius) with their extension buildering jobs for many years....
From £36,600
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £35,625
Hayes, UB3
Relax... you have found a reliable extension builder in Hayes. SMC Building Services is a friendly and reliable company based in Hayes who consider...

Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in Hayes by posting your job to extension builders in Hayes.
"Convert loftspear bed room with shower and toilet" - UB2, job posted 05/01/24
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 - £17,710

Two storey extension - £88,316

Build a timber frame extension - £26,210

Build a swimming pool - £81,210

Single storey extension - £59,208

Side return extension - £43,867

Install an RSJ - £2,410

Outbuilding - £10,210

Build a Mansard loft conversion - £52,210

Loft conversion - £35,723

Build a kitchen extension - £42,210

Hip to gable loft conversion - £42,210

Granny annexe - £87,210

Garden office - £10,210

Convert a Garage - £16,210

Garage - £18,710

Build a flat roof extension - £22,210

Build a dormer loft conversion - £42,210

Concrete foundations - £6,460

Convert a bungalow loft - £29,210

Convert a basement - £39,867