Add extra space to your Streatham home from £42,048

Dormer loft conversions are ideal if you want to add lots of extra space to your home. Adding a box-like structure or structures to the roof, you essentially extend the roofline to add significant square footage to your loft space. This makes dormer loft conversions one of the most popular loft conversion types, as they're ideal for adding a new main bedroom with en-suite or even a self-contained living space. To see prices and availability for your job click green button.

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From £42,048

Rates verified Sep 26
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J&J Building Solutions

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Streatham. No obligation free q...

From £43,200

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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...

From £43,024

Last active Nov 26
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Buci builders ltd

Robert Buci

Buci builders ltd is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get a competitive ...

From £42,144

Last active Nov 26
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Greens Gardening & Landscape Property Maintenance

John Mcdonagh

Watch our short video highlighting all our expertise and services here:

more than 10 y...

From £42,128

Last active Oct 26
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J & D Construction

Trusted and professional extension builder in Streatham. Experienced in all extension buildering work and keeping within budget and on quote. J & D...

From £42,104

Last active Oct 26
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Langston Builders

Langston Builders is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get a competitive ...

From £42,072

Last active Oct 26
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Sonik Building Services

Trusted and professional extension builder in Streatham. Experienced in all extension buildering work and keeping within budget and on quote. Sonik...

From £42,416

Last active Oct 26
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ACE BUILDING CONTRACTORS AND D

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

From £42,320

Last active Oct 26
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Renaissance Timothy Brewer Ltd

Renaissance Timothy Brewer Ltd is an established extension buildering business in Streatham. We come highly recommended and provide competitive quo...

From £42,184

Last active Oct 26
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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...

Cost of dormer loft conversions in Streatham

Estimates for build a dormer loft conversion near Streatham

In Streatham, prices for dormer loft conversions range from £42,048 (J&J Building Solutions based in SW16) to £43,200 (Banga Decoration based in CR7), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for. 

The best way to get an accurate price is to compare quotes from extension builders in Streatham. Post your job on HaMuch now and we'll put you in touch with available extension builders.


Estimates for common extension builder jobs in Streatham;

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.

More extensions & conversions cost guides...