From £21,784
NICK SMITH BUILDERS is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for your wor...
From £22,040
Been in the trade for over 30 yrs and take pride in my work. Fully insured and references both trade and private available
From £22,184
Stubbington Roofing Ltd. is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for you...
From £22,000
We are experts in cavity wall insulation, cavity wall insulation removal, loft insulation, loft boarding, room in roof insulation, chemical damp pr...
From £21,976
O NEILL CONSTRUCTION LTD is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for you...
From £22,192
Trusted and professional extension builder in PO15. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...
From £21,928
Relax... you have found a reliable extension builder in PO15. MA Builders is a friendly and reliable company based in PO15 who consider no job as t...
From £21,984
Trusted and professional extension builder in PO15. Experienced in all extension buildering work and keeping within budget and on quote. DAVE HARRI...
From £21,920
We were incorporated in 2015 and have been providing a level of service to our clients that is unparalleled, using knowledge built from 20+ years w...
From £22,304
Thermic Homes is an energy-saving home improvement company operating out of the south coast of England. Our mission is to create warmer homes for t...

A flat roof extension ranges from the cheapest of £21,784 (NICK SMITH BUILDERS based in PO15) to the dearest of £22,304 (Thermic Homes based in PO16), 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 PO15 by posting a job with HaMuch. We'll send it to extension builders in PO15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Fareham | £35 | £250 |
| Build A Flat Roof Extension near Locks Heath | £33 | £240 |
| Build A Flat Roof Extension near Lee-on-the-Solent | £35 | £249 |
| Build A Flat Roof Extension near Hedge End | £34 | £244 |
| Build A Flat Roof Extension near Gosport | £35 | £246 |
| Build A Flat Roof Extension near Portsmouth | £36 | £250 |
| Build A Flat Roof Extension near Waterlooville | £36 | £250 |
| Build A Flat Roof Extension near Southampton | £34 | £243 |
| Build A Flat Roof Extension near Horndean | £35 | £253 |
| Build A Flat Roof Extension near Eastleigh | £34 | £244 |
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 - £17,531

Two storey extension - £88,047

Build a timber frame extension - £26,031

Build a swimming pool - £81,031

Single storey extension - £55,624

Side return extension - £41,851

Install an RSJ - £2,231

Outbuilding - £10,031

Build a Mansard loft conversion - £52,031

Loft conversion - £34,043

Build a kitchen extension - £42,031

Hip to gable loft conversion - £42,031

Granny annexe - £87,031

Garden office - £10,031

Convert a Garage - £16,031

Garage - £18,531

Build a flat roof extension - £22,031

Build a dormer loft conversion - £42,031

Concrete foundations - £6,281

Convert a bungalow loft - £29,031

Convert a basement - £37,851