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Has anyone added a second storey to their extension
Roughly, how much would building a second floor on top of an existing extension cost? It's about 4 metres by 6 metres
Expert Trade Answers
"Hi Jenny ,
At a rough guide it would be around £2500 per m2
Thanks"
At a rough guide it would be around £2500 per m2
Thanks"
Answered on 31st Aug 2025 - Member since Jan 2025 -
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"You might need the foundations exposed to establish if they are sufficient for the second floor. The rough cost for the extension would be around £72,000 plus VAT. It will depend on what needs to be rearranged inside to enable the extension to work."
Answered on 31st Aug 2025 - Member since Aug 2023 -
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"Yes you can add to existing extension depending on a report from an inspection.price roughly around £2.300 per m2"
Answered on 31st Aug 2025 - Member since May 2021 -
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"It is depend of actual footings and requirements for double storey. Price is also depend of the finishing, numbers of windows, type of the roof etc. Also what area you are? I would say £50-60k."
Answered on 31st Aug 2025 - Member since Aug 2025 -
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