From £22,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in RM1. No obligation free quotes ...
From £21,880
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in RM1. No obligation free quote...
From £22,064
Hyde Building Ltd are here to help customers who need an Extension Builder in RM1. We offer a competitive rate to complete all your extension build...
From £22,360
Need an Extension Builder in RM1? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering jo...
1 review
From £22,192
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £22,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £22,392
Need an Extension Builder in RM1? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £22,152
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £23,024
Buci builders ltd is a trusted extension builder serving customers in RM1 and the surrounding area. Contact us to today to get a competitive quote ...
From £22,312
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in RM1. Please contact us for a free, no obligat...

A flat roof extension ranges from the cheapest of £21,880 (CIA Construction Limited based in RM18) to the dearest of £23,024 (Buci builders ltd based in SE27), 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 RM1 by posting a job with HaMuch. We'll send it to extension builders in RM1.
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 - £17,745

Two storey extension - £88,367

Build a timber frame extension - £26,245

Build a swimming pool - £81,245

Single storey extension - £59,896

Side return extension - £44,254

Install an RSJ - £2,445

Outbuilding - £10,245

Build a Mansard loft conversion - £52,245

Loft conversion - £36,045

Build a kitchen extension - £42,245

Hip to gable loft conversion - £42,245

Granny annexe - £87,245

Garden office - £10,245

Convert a Garage - £16,245

Garage - £18,745

Build a flat roof extension - £22,245

Build a dormer loft conversion - £42,245

Concrete foundations - £6,495

Convert a bungalow loft - £29,245

Convert a basement - £40,254