We send your job to ALL TN21 extension builders
Available extension builders in TN21 reply
Select an affordable extension builder
From £17,628
Relax... you have found a reliable extension builder in TN21. CUSTOM BUILD (SUSSEX) LIMITED is a friendly and reliable company based in TN21 who co...
From £17,532
Need an Extension Builder in TN21? I R C BUILDING SERVICES has been helping local clients (20 mile radius) with their extension buildering jobs for...

Underpinning ranges from £17,532 (I R C BUILDING SERVICES based in TN21) to £17,628 (CUSTOM BUILD (SUSSEX) LIMITED based in TN21), 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 TN21 by posting a job with HaMuch and we will send it to extension builders in TN21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Wealden | £35 | £256 |
| Underpin A Building near Hailsham | £31 | £243 |
| Underpin A Building near Crowborough | £36 | £258 |
| Underpin A Building near Tunbridge Wells | £37 | £258 |
| Underpin A Building near Bexhill-on-Sea | £31 | £243 |
| Underpin A Building near Eastbourne | £32 | £245 |
| Underpin A Building near Seaford | £34 | £243 |
| Underpin A Building near Hastings | £31 | £246 |
| Underpin A Building near Haywards Heath | £35 | £256 |
| Underpin A Building near Tonbridge | £38 | £254 |
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 - £17,580

Two storey extension - £88,120

Build a timber frame extension - £26,080

Build a swimming pool - £81,080

Single storey extension - £56,600

Side return extension - £42,400

Install an RSJ - £2,280

Outbuilding - £10,080

Build a Mansard loft conversion - £52,080

Loft conversion - £34,500

Build a kitchen extension - £42,080

Hip to gable loft conversion - £42,080

Granny annexe - £87,080

Garden office - £10,080

Convert a Garage - £16,080

Garage - £18,580

Build a flat roof extension - £22,080

Build a dormer loft conversion - £42,080

Concrete foundations - £6,330

Convert a bungalow loft - £29,080

Convert a basement - £38,400