From £18,572
Watford, WD25
Hello I am Emilian , the proud owner of Eeoc Ltd, A little about me With many happy and returning customers over the last 14 years, y...
From £19,004
We are experienced and skilled landscapers, covering a wide range of landscape gardening, driveway installations and groundworks. With over 15 year...
From £17,380
Relax... you have found a reliable extension builder in WD25. Crown Building is a friendly and reliable company based in WD25 who consider no job a...
From £17,612
J Pellow & Son Ltd are here to help customers who need an Extension Builder in WD25. We offer a competitive rate to complete all your extension bui...
From £17,636
Garston, WD25
Experienced extension builder ready to quote for your work. Murati Building LTD is the best extension builder in WD25. No obligation free quotes an...
From £17,508
Our building services company Conversion Property and Electrical Services has 17 years of experience in the industry. We have been helping customer...
From £17,412
Experienced extension builder ready to quote for your work. Progressive Design London is the best extension builder in WD25. No obligation free quo...
From £17,644
Primrose Projects is an established and experienced local extension builder in WD25. Please contact us for a free, no obligation quote and competit...
From £17,772
Relax... you have found a reliable extension builder in WD25. Tonybuild is a friendly and reliable company based in WD25 who consider no job as too...
From £17,764
Need an Extension Builder in WD25? EMA Contractors has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...

Underpinning ranges from £17,380 (Crown Building based in WD24) to £19,004 (BMS Landscaping & Paving LTD based in WD24), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in WD25 by posting a job with HaMuch and we will send it to extension builders in WD25.
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 - £17,830

Two storey extension - £88,496

Build a timber frame extension - £26,330

Build a swimming pool - £81,330

Single storey extension - £61,608

Side return extension - £45,217

Install an RSJ - £2,530

Outbuilding - £10,330

Build a Mansard loft conversion - £52,330

Loft conversion - £36,848

Build a kitchen extension - £42,330

Hip to gable loft conversion - £42,330

Granny annexe - £87,330

Garden office - £10,330

Convert a Garage - £16,330

Garage - £18,830

Build a flat roof extension - £22,330

Build a dormer loft conversion - £42,330

Concrete foundations - £6,580

Convert a bungalow loft - £29,330

Convert a basement - £41,217