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From £23,200
Banga Decoration
Sebastian Banga
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Buci builders ltd
Robert Buci
Buci builders ltd is a trusted extension builder serving customers in Penge and the surrounding area. Contact us to today to get a competitive quot...
Greens Gardening & Landscape Property Maintenance
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
J&S WALLINGTON LIMITED
We provide our clients with excellent service and quality. Whether you are looking to extend or upgrade, our professional team has the skills and e...
Cre8tive Contractors Ltd
Cre8tive Contractors Ltd are here to help customers who need an Extension Builder in Penge. We offer a competitive rate to complete all your extens...
RCB Group Design & Build
Vasi J
No Call out charges!
All Jobs Fully Insured and Guaranteed !!!
All aspects of Plumbing, Heating and Drains....
..."I am very pleased with the work carried out. All very clear and transparent." - ROMFORD,reviewed 10/01/18, KELLY
Glenn Miller Builders Limited
Glenn Miller
Relax... you have found a reliable extension builder in Penge. Glenn Miller Builders Limited is a friendly and reliable company based in Penge who ...
L M G Building Services (London) Ltd
Relax... you have found a reliable extension builder in Penge. L M G Building Services (London) Ltd is a friendly and reliable company based in Pen...
Aviemore Building Contractors Ltd
Experienced extension builder ready to quote for your work. Aviemore Building Contractors Ltd is the best extension builder in Penge. No obligation...
AAB Tile Installation & Repairs
AAB Tile Installation & Repairs are here to help customers who need an Extension Builder in Penge. We offer a competitive rate to complete all your...
Flat roof extension cost in Penge
A flat roof extension ranges from the cheapest of £21,984 (RCB Group Design & Build based in SE21) to the dearest of £23,200 (Banga Decoration based in CR7), 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 Penge by posting a job with HaMuch. We'll send it to extension builders in Penge.
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Estimates for common extension builder jobs in Penge;
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 - £17,852
Two storey extension - £88,528
Build a timber frame extension - £26,352
Build a swimming pool - £81,352
Single storey extension - £62,040
Side return extension - £45,460
Install an RSJ - £2,552
Outbuilding - £10,352
Build a Mansard loft conversion - £52,352
Loft conversion - £37,050
Build a kitchen extension - £42,352
Hip to gable loft conversion - £42,352
Granny annexe - £87,352
Garden office - £10,352
Convert a Garage - £16,352
Garage - £18,852
Build a flat roof extension - £22,352
Build a dormer loft conversion - £42,352
Concrete foundations - £6,602
Convert a bungalow loft - £29,352
Convert a basement - £41,460