From £86,576
L E JONES BUILDER is an established extension buildering business in CF42. We come highly recommended and provide competitive quotes for your work....
From £86,528
Need an Extension Builder in CF42? A POWELL CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £86,808
Dare Fitness is an established extension buildering business in CF42. We come highly recommended and provide competitive quotes for your work.
...From £86,720
G Wager Building Maintenance is a trusted extension builder serving customers in CF42 and the surrounding area. Contact us to today to get a compet...
From £86,496
Trusted and professional extension builder in CF42. Experienced in all extension buildering work and keeping within budget and on quote. RJ CONSTRU...
From £86,896
Barlam Drylining Ltd are here to help customers who need an Extension Builder in CF42. We offer a competitive rate to complete all your extension b...
From £86,824
Need an Extension Builder in CF42? FORMWORK CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £86,576
Relax... you have found a reliable extension builder in CF42. Cwtch Property Developments is a friendly and reliable company based in CF42 who cons...
From £86,952
Trusted and professional extension builder in CF42. Experienced in all extension buildering work and keeping within budget and on quote. Complete B...
From £86,616
Excel Home Design Ltd is an established extension buildering business in CF42. We come highly recommended and provide competitive quotes for your w...

Building a granny annexe ranges from £86,496 (RJ CONSTRUCTION based in CF40) to £86,952 (Complete Building Contractors based in CF34), 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 CF42 by posting a job with HaMuch. We will send it to extension builders in CF42 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Rhondda, Cynon, Taff | £31 | £209 |
| Granny Annexe near Aberdare | £32 | £212 |
| Granny Annexe near Rhondda | £31 | £206 |
| Granny Annexe near Maesteg | £38 | £283 |
| Granny Annexe near Merthyr Tydfil | £33 | £220 |
| Granny Annexe near Pontypridd | £33 | £211 |
| Granny Annexe near Neath Port Talbot | £31 | £224 |
| Granny Annexe near Church Village | £34 | £214 |
| Granny Annexe near Bridgend | £32 | £200 |
| Granny Annexe near Pyle | £34 | £262 |
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 - £17,199

Two storey extension - £87,549

Build a timber frame extension - £25,699

Build a swimming pool - £80,699

Single storey extension - £48,984

Side return extension - £38,116

Install an RSJ - £1,899

Outbuilding - £9,699

Build a Mansard loft conversion - £51,699

Loft conversion - £30,930

Build a kitchen extension - £41,699

Hip to gable loft conversion - £41,699

Granny annexe - £86,699

Garden office - £9,699

Convert a Garage - £15,699

Garage - £18,199

Build a flat roof extension - £21,699

Build a dormer loft conversion - £41,699

Concrete foundations - £5,949

Convert a bungalow loft - £28,699

Convert a basement - £34,116