1 review
From £16,192
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £16,392
Need an Extension Builder in WD3? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £16,280
Member since August 2026
Relax... you have found a reliable extension builder in WD3. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in WD3 who cons...
From £16,192
Need an Extension Builder in WD3? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many years...
From £16,280
Trusted and professional extension builder in WD3. Experienced in all extension buildering work and keeping within budget and on quote. DC Build & ...
From £16,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,152
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £16,304
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £16,424
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £15,920
NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...

Garage conversions in WD3 typically range from £15,920 (Nisup Building Services based in HA8) to £16,424 (LALI BUILDERS based in NW10), but the only way to get an accurate cost for your specific project is to get quotes.
Post a job with HaMuch and we'll send it to extension builders in WD3 who will be happy to help.
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 - £17,745

Two storey extension - £88,367

Build a timber frame extension - £26,245

Build a swimming pool - £81,245

Single storey extension - £59,896

Side return extension - £44,254

Install an RSJ - £2,445

Outbuilding - £10,245

Build a Mansard loft conversion - £52,245

Loft conversion - £36,045

Build a kitchen extension - £42,245

Hip to gable loft conversion - £42,245

Granny annexe - £87,245

Garden office - £10,245

Convert a Garage - £16,245

Garage - £18,745

Build a flat roof extension - £22,245

Build a dormer loft conversion - £42,245

Concrete foundations - £6,495

Convert a bungalow loft - £29,245

Convert a basement - £40,254