We send your job to ALL Barry extension builders
Available extension builders in Barry reply
Select an affordable extension builder
From £87,240
Lewis Jones
Member since October 2026
Barry, CF62
We are polite, punctual and respectful small construction business. We take pride in all our work.
The Philog Paving Services is an established extension buildering business in Barry. We come highly recommended and provide competitive quotes for ...
Experienced extension builder ready to quote for your work. Chapman Builders is the best extension builder in Barry. No obligation free quotes and ...
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in Barry. No obligation free quot...
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 Barry and the surrounding area. Contact us to today to get a competitive qu...
Trusted and professional extension builder in Barry. Experienced in all extension buildering work and keeping within budget and on quote. Elite Bui...
Robert Lewis
RDL BUILDING SERVICES LTD is a trusted extension builder serving customers in Barry and the surrounding area. Contact us to today to get a competit...
Barry, CF62
Relax... you have found a reliable extension builder in Barry. DPC BUILDERS is a friendly and reliable company based in Barry who consider no job a...
Barry, CF62
Blueprint Construction & Development Ltd is a trusted extension builder serving customers in Barry and the surrounding area. Contact us to today to...

Building a granny annexe ranges from £86,200 (Penarth Loft Conversions Ltd based in CF64) to £87,600 (Blueprint Construction & Development Ltd based in CF62), 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 Barry by posting a job with HaMuch. We will send it to extension builders in Barry who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Barry | £33 | £223 |
| Granny Annexe near Penarth | £35 | £224 |
| Granny Annexe near Vale of Glamorgan | £29 | £217 |
| Granny Annexe near Cardiff | £34 | £223 |
| Granny Annexe near Church Village | £34 | £214 |
| Granny Annexe near Caerphilly | £33 | £208 |
| Granny Annexe near Bridgend | £32 | £200 |
| Granny Annexe near Pontypridd | £33 | £211 |
| Granny Annexe near Rhondda | £31 | £206 |
| Granny Annexe 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 - £17,270

Two storey extension - £87,654

Build a timber frame extension - £25,770

Build a swimming pool - £80,770

Single storey extension - £50,392

Side return extension - £38,908

Install an RSJ - £1,970

Outbuilding - £9,770

Build a Mansard loft conversion - £51,770

Loft conversion - £31,590

Build a kitchen extension - £41,770

Hip to gable loft conversion - £41,770

Granny annexe - £86,770

Garden office - £9,770

Convert a Garage - £15,770

Garage - £18,270

Build a flat roof extension - £21,770

Build a dormer loft conversion - £41,770

Concrete foundations - £6,020

Convert a bungalow loft - £28,770

Convert a basement - £34,908