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From £79,000
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...
Greens Gardening & Landscape Property Maintenance
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Glenn Miller Builders Limited
Glenn Miller
Relax... you have found a reliable extension builder in SE25. Glenn Miller Builders Limited is a friendly and reliable company based in SE25 who co...
Aviemore Building Contractors Ltd
Experienced extension builder ready to quote for your work. Aviemore Building Contractors Ltd is the best extension builder in SE25. No obligation ...
Oaksure Construction
Stuart Bogazzi
Working as a builder for over 20 years now.
Family run business
Can sort any problem out and help build your dreams.
Bhagtana & Co Construction
Experienced extension builder ready to quote for your work. Bhagtana & Co Construction is the best extension builder in SE25. No obligation free qu...
K S BUILDERS (UK) LTD
Trusted and professional extension builder in SE25. Experienced in all extension buildering work and keeping within budget and on quote. K S BUILDE...
VDL Construction Ltd
Need to find an Extension Builder near you for all your extension buildering work?
VDL Construction Ltd provides a local, trusted extension...
Top Builders
Experienced extension builder ready to quote for your work. Top Builders is the best extension builder in SE25. No obligation free quotes and many ...
Howland Building Services
Need to find an Extension Builder near you for all your extension buildering work?
Howland Building Services provides a local, trusted exte...
Extension builder estimates (based on hourly rates) to build a single storey extension in SE25
- How much does a single storey extension cost?
- Single storey extension cost calculator
- What size single storey extension can I build without planning permission?
- Do I need an architect for an extension?
- How deep do foundations need to be for a single storey extension?
- Is it cheaper to have an extension or a conservatory?
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Estimates for common extension builder jobs in SE25;
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 - £17,774
Two storey extension - £88,412
Build a timber frame extension - £26,274
Build a swimming pool - £81,274
Single storey extension - £60,488
Side return extension - £44,587
Install an RSJ - £2,474
Outbuilding - £10,274
Build a Mansard loft conversion - £52,274
Loft conversion - £36,323
Build a kitchen extension - £42,274
Hip to gable loft conversion - £42,274
Granny annexe - £87,274
Garden office - £10,274
Convert a Garage - £16,274
Garage - £18,774
Build a flat roof extension - £22,274
Build a dormer loft conversion - £42,274
Concrete foundations - £6,524
Convert a bungalow loft - £29,274
Convert a basement - £40,587