From £22,240
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...

A flat roof extension ranges from the cheapest of £21,200 (Penarth Loft Conversions Ltd based in CF64) to the dearest of £22,600 (Blueprint Construction & Development Ltd based in CF62), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Barry by posting a job with HaMuch. We'll send it to extension builders in Barry.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Barry | £33 | £223 |
| Build A Flat Roof Extension near Penarth | £35 | £224 |
| Build A Flat Roof Extension near Vale of Glamorgan | £29 | £217 |
| Build A Flat Roof Extension near Cardiff | £34 | £223 |
| Build A Flat Roof Extension near Church Village | £34 | £214 |
| Build A Flat Roof Extension near Caerphilly | £33 | £208 |
| Build A Flat Roof Extension near Bridgend | £32 | £200 |
| Build A Flat Roof Extension near Pontypridd | £33 | £211 |
| Build A Flat Roof Extension near Rhondda | £31 | £206 |
| Build A Flat Roof Extension 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