Extend your PO3 with an extension

A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in PO3? To see prices and availability for your job click green button.

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From £22,144

Last active Nov 26
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SBS Building Services

Steve Bannister

We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...

From £21,968

Last active Jul 26
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Shepperd Developments

Experienced extension builder ready to quote for your work. Shepperd Developments is the best extension builder in PO3. No obligation free quotes a...

From £21,976

Last active Jul 26
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Portsmouth Building Repairs

Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in PO3. No obligation free qu...

From £21,936

Last active Jul 26
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Peter Fenn Property

Peter Fenn Property is a trusted extension builder serving customers in PO3 and the surrounding area. Contact us to today to get a competitive quot...

From £22,176

Last active Jul 26
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JKS Property

JKS Property is an established and experienced local extension builder in PO3. Please contact us for a free, no obligation quote and competitive ra...

From £21,920

Last active Jul 26
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M.K Warner Building Services

M.K Warner Building Services is an established extension buildering business in PO3. We come highly recommended and provide competitive quotes for ...

From £21,992

Last active Jul 26
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BUILD PROJECT LIMITED

BUILD PROJECT LIMITED are here to help customers who need an Extension Builder in PO3. We offer a competitive rate to complete all your extension b...

From £22,088

Last active Jul 26
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JM Roofing & Building Services

Experienced extension builder ready to quote for your work. JM Roofing & Building Services is the best extension builder in PO3. No obligation free...

From £22,128

Last active Jun 26
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SLG Mills Building Services

Relax... you have found a reliable extension builder in PO3. SLG Mills Building Services is a friendly and reliable company based in PO3 who consid...

From £21,736

Last active Jun 26
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H B Builders

Steve Harris

Hi my name is Steve harris of hb builders we are based in portchester and have over 40 years of experience in the building trade we would be mor...

Flat roof extension cost in PO3

Estimates for build a flat roof extension near PO3

A flat roof extension ranges from the cheapest of £21,736 (H B Builders based in PO16) to the dearest of £22,176 (JKS Property based in PO5), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes. 

Find out how much your flat roof extension will cost in PO3 by posting a job with HaMuch. We'll send it to extension builders in PO3.


Estimates for common extension builder jobs in PO3;

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...