From £37,500
London, UB3
Relax... you have found a reliable extension builder in UB3. Millimetre HQR Limited is a friendly and reliable company based in UB3 who consider no...
From £36,900
Trusted and professional extension builder in UB3. Experienced in all extension buildering work and keeping within budget and on quote. SME Builder...
From £33,075
Hayes, UB3
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
Reliable construction and Joinery company with a track record of excellence. Skilled professionals delivering innovative solutions for over 20 year...
From £32,700
Hayes, UB3
Nirvair Builders is an established extension buildering business in UB3. We come highly recommended and provide competitive quotes for your work.
From £34,875
Trusted and professional extension builder in UB3. Experienced in all extension buildering work and keeping within budget and on quote. Elegance Co...
From £36,600
Hertfordshire, UB3
Game Planner is a trusted extension builder serving customers in UB3 and the surrounding area. Contact us to today to get a competitive quote for e...
From £36,375
Need an Extension Builder in UB3? Nexdat Ltd has been helping local clients (10 mile radius) with their extension buildering jobs for many years. G...
From £36,600
Hayes, UB3
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £35,625
Relax... you have found a reliable extension builder in UB3. SMC Building Services is a friendly and reliable company based in UB3 who consider no ...

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 UB3 by posting your job to extension builders in UB3.
"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