From £17,292
T Porter Buiding is an established and experienced local extension builder in Grangetown. Please contact us for a free, no obligation quote and com...
From £17,132
Relax... you have found a reliable extension builder in Grangetown. Charles Marshall Contracting Ltd is a friendly and reliable company based in Gr...
From £16,700
Very reliable honest and hard working guarantee all work clean and tidy first class work
From £17,260
Sharif General Builder is an established and experienced local extension builder in Grangetown. Please contact us for a free, no obligation quote a...
From £18,236
An experienced quality tradesman who is a member of the federation of master builders.
Any projects will be undertaken safely, professio...
From £17,340
MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in Grangetown. We offer a competitive rate to complete all you...
From £17,228
Neil Causon & Son is an established and experienced local extension builder in Grangetown. Please contact us for a free, no obligation quote and co...
From £17,260
Construction Jobs is an established and experienced local extension builder in Grangetown. Please contact us for a free, no obligation quote and co...
From £17,316
Eric J Ivins is a trusted extension builder serving customers in Grangetown and the surrounding area. Contact us to today to get a competitive quot...
From £16,700
35 years in the trade and there is not much we haven't come across or done from pools to extensions and we specialise in loft conversions

Underpinning ranges from £16,700 (A.Gaddarn Builders based in NP11) to £18,236 (WMP Builders based in TA9), 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 Grangetown by posting a job with HaMuch and we will send it to extension builders in Grangetown.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £34 | £219 |
| Underpin A Building near Penarth | £35 | £218 |
| Underpin A Building near Barry | £33 | £218 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Vale of Glamorgan | £29 | £217 |
| Underpin A Building near Weston-super-Mare | £33 | £253 |
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 - £17,246

Two storey extension - £87,620

Build a timber frame extension - £25,746

Build a swimming pool - £80,746

Single storey extension - £49,928

Side return extension - £38,647

Install an RSJ - £1,946

Outbuilding - £9,746

Build a Mansard loft conversion - £51,746

Loft conversion - £31,373

Build a kitchen extension - £41,746

Hip to gable loft conversion - £41,746

Granny annexe - £86,746

Garden office - £9,746

Convert a Garage - £15,746

Garage - £18,246

Build a flat roof extension - £21,746

Build a dormer loft conversion - £41,746

Concrete foundations - £5,996

Convert a bungalow loft - £28,746

Convert a basement - £34,647