From £22,216
, TW20
Need an Extension Builder in TW20? Keay Roofing Services Ltd has been helping local clients (10 mile radius) with their extension buildering jobs f...
From £22,160
EGPM LTD are here to help customers who need an Extension Builder in TW20. We offer a competitive rate to complete all your extension buildering jo...
From £22,464
Egham, TW20
Kandy Build and Construction Ltd is an established extension buildering business in TW20. We come highly recommended and provide competitive quotes...
From £22,432
ALPHA OMEGA BUILD LTD are here to help customers who need an Extension Builder in TW20. We offer a competitive rate to complete all your extension ...
From £22,312
From 2007 – 2015 David Rudelhoff (Founder and Director) was the Property Manager for a high profile, high net worth family. During that time, in ...
From £22,056
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,096
We have over 15 years of experience in the building trade. We are a small family run business and pride ourselves on our exceptional customer servi...
From £22,232
Need an Extension Builder in TW20? ABCXYZ has been helping local clients (10 mile radius) with their extension buildering jobs for many years. Get ...
From £22,256
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,440
Lead by designer Richard Gordon, GDC is a London and Berkshire based Design & Build firm with a vast amount of experience in both the residential a...

A flat roof extension ranges from the cheapest of £22,056 (Deep Builders Ltd based in TW18) to the dearest of £22,464 (Kandy Build and Construction Ltd based in TW20), 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 TW20 by posting a job with HaMuch. We'll send it to extension builders in TW20.
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 - £17,766

Two storey extension - £88,400

Build a timber frame extension - £26,266

Build a swimming pool - £81,266

Single storey extension - £60,328

Side return extension - £44,497

Install an RSJ - £2,466

Outbuilding - £10,266

Build a Mansard loft conversion - £52,266

Loft conversion - £36,248

Build a kitchen extension - £42,266

Hip to gable loft conversion - £42,266

Granny annexe - £87,266

Garden office - £10,266

Convert a Garage - £16,266

Garage - £18,766

Build a flat roof extension - £22,266

Build a dormer loft conversion - £42,266

Concrete foundations - £6,516

Convert a bungalow loft - £29,266

Convert a basement - £40,497