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Select your affordable Llanishen extension builder
The Philog Paving Services is an established extension buildering business in Llanishen. We come highly recommended and provide competitive quotes ...
Experienced extension builder ready to quote for your work. Chapman Builders is the best extension builder in Llanishen. No obligation free quotes ...
Alan Gaddarn
Very reliable honest and hard working guarantee all work clean and tidy first class work
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in Llanishen. No obligation free ...
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in Llanishen. No obligation free quotes and man...
Relax... you have found a reliable extension builder in Llanishen. Charles Marshall Contracting Ltd is a friendly and reliable company based in Lla...
Bill Coslett
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
MARWAY BUILDING LTD is a trusted extension builder serving customers in Llanishen and the surrounding area. Contact us to today to get a competitiv...
Trusted and professional extension builder in Llanishen. Experienced in all extension buildering work and keeping within budget and on quote. Elite...
Paul Knox
Trusted and professional extension builder in Llanishen. Experienced in all extension buildering work and keeping within budget and on quote. PK CO...

Building a granny annexe ranges from £86,040 (PK CONSTRUCTION based in CF14) to £86,808 (Chapman Builders based in CF5), 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 Llanishen by posting a job with HaMuch. We will send it to extension builders in Llanishen who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Cardiff | £34 | £223 |
| Granny Annexe near Caerphilly | £33 | £208 |
| Granny Annexe near Penarth | £35 | £223 |
| Granny Annexe near Risca | £32 | £218 |
| Granny Annexe near Church Village | £34 | £214 |
| Granny Annexe near Newport | £41 | £233 |
| Granny Annexe near Pontypridd | £33 | £211 |
| Granny Annexe near Barry | £33 | £218 |
| Granny Annexe near Cwmbran | £43 | £219 |
| Granny Annexe near Rhondda | £31 | £206 |
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 - £17,017

Two storey extension - £87,275

Build a timber frame extension - £25,517

Build a swimming pool - £80,517

Single storey extension - £45,336

Side return extension - £36,064

Install an RSJ - £1,717

Outbuilding - £9,517

Build a Mansard loft conversion - £51,517

Loft conversion - £29,220

Build a kitchen extension - £41,517

Hip to gable loft conversion - £41,517

Granny annexe - £86,517

Garden office - £9,517

Convert a Garage - £15,517

Garage - £18,017

Build a flat roof extension - £21,517

Build a dormer loft conversion - £41,517

Concrete foundations - £5,767

Convert a bungalow loft - £28,517

Convert a basement - £32,064