Add extra space to your SE25 home from £41,568

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 £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 £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 £42,344

Last active Oct 26
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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...

From £42,296

Last active Sep 26
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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 ...

From £41,568

Last active Sep 26
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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.

From £42,256

Last active Sep 26
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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...

From £42,184

Last active Aug 26
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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...

From £42,240

Last active Aug 26
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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...

From £42,128

Last active Aug 26
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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 ...

From £42,384

Last active Aug 26
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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...

Cost of dormer loft conversions in SE25

Estimates for build a dormer loft conversion near SE25

In SE25, prices for dormer loft conversions range from £41,568 (Oaksure Construction based in CR0) 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 SE25. Post your job on HaMuch now and we'll put you in touch with available extension builders.

"Build a dormer loft conversion" - BR3, job posted 01/01/70


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.

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