Add extra space to your Portslade home from £41,768

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 £42,800

Rates updated Oct 26
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RA Construction

Ricky Alexander

Trusted and professional extension builder in Portslade. Experienced in all extension buildering work and keeping within budget and on quote. RA Co...

From £42,024

Rates verified Oct 26
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Ferguson Building Services Limited

Ferguson Building Services Limited is an established and experienced local extension builder in Portslade. Please contact us for a free, no obligat...

From £41,768

Last active Nov 26
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Graeme Davies Plumbing and Heating

Graeme Davies

Experienced extension builder ready to quote for your work. Graeme Davies Plumbing and Heating is the best extension builder in Portslade. No oblig...

From £41,984

Last active Oct 26
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FIRST FORMAT BUILDING

Need to find an Extension Builder near you for all your extension buildering work?

FIRST FORMAT BUILDING provides a local, trusted extensio...

From £42,176

Last active Oct 26
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East West Refurbishment Limited

Need an Extension Builder in Portslade? East West Refurbishment Limited has been helping local clients (20 mile radius) with their extension builde...

From £41,856

Last active Oct 26
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Citadel Construction

Citadel Construction is an established extension buildering business in Portslade. We come highly recommended and provide competitive quotes for yo...

From £41,840

Last active Oct 26
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SIX STUDI? DESIGN

The studio is based on our founder's vision in concept and interior design, Fabio Lauro has long been in the business of creating atmospheres. His ...

From £41,992

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H P Building Services Sussex

Member since August 2026

H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...

From £42,296

Last active Oct 26
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Proper Copper Design

Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...

From £41,992

Last active Oct 26
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Brighton Marina Hand Car Wash

Experienced extension builder ready to quote for your work. Brighton Marina Hand Car Wash is the best extension builder in Portslade. No obligation...

Cost of dormer loft conversions in Portslade

Estimates for build a dormer loft conversion near Portslade

In Portslade, prices for dormer loft conversions range from £41,768 (Graeme Davies Plumbing and Heating based in BN3) to £42,800 (RA Construction based in BN2), 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 Portslade. Post your job on HaMuch now and we'll put you in touch with available extension builders.


Estimates for common extension builder jobs in Portslade;

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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