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SDS Constructions
Sean Smithers
Our building services company SDS Constructions has been established for many years and have been providing customers in Dagenham and the surroundi...
From £21,880
Can design and Construction
Erald Kanani
Member since August 2025
Barking, IG11
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Render
Experienced extension builder ready to quote for your work. Render is the best extension builder in Barking. No obligation free quotes and many hap...
Decorating Building Service
Decorating Building Service are here to help customers who need an Extension Builder in Barking. We offer a competitive rate to complete all your e...
Sevcan Construction
Relax... you have found a reliable extension builder in Barking. Sevcan Construction is a friendly and reliable company based in Barking who consid...
Kunshi Services UK Ltd
Barking, IG11
Kunshi Services UK Ltd is a trusted extension builder serving customers in Barking and the surrounding area. Contact us to today to get a competiti...
From £22,176
Fedora and sons Ltd
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in Barking and the surrounding area. Contact us to today to get a competitive ...
G HAMID CONSTRUCTION LTD
Relax... you have found a reliable extension builder in Barking. G HAMID CONSTRUCTION LTD is a friendly and reliable company based in Barking who c...
MONOLITH CONSTRUCTION LTD
Need an Extension Builder in Barking? MONOLITH CONSTRUCTION LTD has been helping local clients (10 mile radius) with their extension buildering job...
Buildem Ltd
Buildem Ltd is a trusted extension builder serving customers in Barking and the surrounding area. Contact us to today to get a competitive quote fo...
Flat roof extension cost in Barking
A flat roof extension ranges from the cheapest of £21,880 (Can design and Construction based in Ig11) to the dearest of £22,712 (Render based in IG1), 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 Barking by posting a job with HaMuch. We'll send it to extension builders in Barking.
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- Factors affecting the cost of flat roof extensions
- Advantages and disadvantages of flat roofs
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- Do you need planning permission for a flat roof extension?
- How long does a flat roof last?
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- What insulation do I need for a flat roof extension?
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Estimates for common extension builder jobs in Barking;
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 - £17,736
Two storey extension - £88,354
Build a timber frame extension - £26,236
Build a swimming pool - £81,236
Single storey extension - £59,720
Side return extension - £44,155
Install an RSJ - £2,436
Outbuilding - £10,236
Build a Mansard loft conversion - £52,236
Loft conversion - £35,963
Build a kitchen extension - £42,236
Hip to gable loft conversion - £42,236
Granny annexe - £87,236
Garden office - £10,236
Convert a Garage - £16,236
Garage - £18,736
Build a flat roof extension - £22,236
Build a dormer loft conversion - £42,236
Concrete foundations - £6,486
Convert a bungalow loft - £29,236
Convert a basement - £40,155