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J&J Building Solutions
Streatham, SW16
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SW16. No obligation free quotes...
From £53,200
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 SW16 and the surrounding area. Contact us to today to get a competitive quote...
Greens Gardening & Landscape Property Maintenance
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Langston Builders
Langston Builders is a trusted extension builder serving customers in SW16 and the surrounding area. Contact us to today to get a competitive quote...
Tenfold Renovation
Tenfold Renovation
Need to find an Extension Builder near you for all your extension buildering work?
Tenfold Renovation provides a local, trusted extension b...
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
PW Construction & Renovation Ltd
PW Construction & Renovation Ltd is a trusted extension builder serving customers in SW16 and the surrounding area. Contact us to today to get a co...
PRM BUILDING
Streatham, SW16
Relax... you have found a reliable extension builder in SW16. PRM BUILDING is a friendly and reliable company based in SW16 who consider no job as ...
QSA Builders Ltd
QSA Builders Ltd are here to help customers who need an Extension Builder in SW16. We offer a competitive rate to complete all your extension build...
Mansard loft conversion cost in SW16
Mansard loft conversions range from the cheapest installation of £51,984 (RCB Group Design & Build based in SE21) to the dearest of around £53,200 (Banga Decoration based in CR7).
While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.
Get quotes to install a mansard loft conversion in SW16 by posting a job with HaMuch and we'll send it to extension builders in SW16.
- How much does a mansard loft conversion cost?
- What is a mansard loft conversion?
- Factors that affect the cost of a mansard loft conversion
- Additional costs to consider with a mansard loft conversion
- How long does a mansard loft conversion take?
- Do I need planning permission for a mansard roof?
- What is the difference between a dormer and a mansard?
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Estimates for common extension builder jobs in SW16;
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 - £17,838
Two storey extension - £88,508
Build a timber frame extension - £26,338
Build a swimming pool - £81,338
Single storey extension - £61,768
Side return extension - £45,307
Install an RSJ - £2,538
Outbuilding - £10,338
Build a Mansard loft conversion - £52,338
Loft conversion - £36,923
Build a kitchen extension - £42,338
Hip to gable loft conversion - £42,338
Granny annexe - £87,338
Garden office - £10,338
Convert a Garage - £16,338
Garage - £18,838
Build a flat roof extension - £22,338
Build a dormer loft conversion - £42,338
Concrete foundations - £6,588
Convert a bungalow loft - £29,338
Convert a basement - £41,307