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From £87,128
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 £87,032
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...

Building a granny annexe ranges from £87,032 (I R C BUILDING SERVICES based in TN21) to £87,128 (CUSTOM BUILD (SUSSEX) LIMITED based in TN21), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in TN21 by posting a job with HaMuch. We will send it to extension builders in TN21 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Wealden | £35 | £256 |
| Granny Annexe near Hailsham | £31 | £243 |
| Granny Annexe near Crowborough | £36 | £258 |
| Granny Annexe near Tunbridge Wells | £37 | £258 |
| Granny Annexe near Bexhill-on-Sea | £31 | £243 |
| Granny Annexe near Eastbourne | £32 | £245 |
| Granny Annexe near Seaford | £34 | £243 |
| Granny Annexe near Hastings | £31 | £246 |
| Granny Annexe near Haywards Heath | £35 | £256 |
| Granny Annexe 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