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    How wide do extension footings need to be?


    Hello all,

    I am planning on some extension work and have not been able to find out how wide the footings for the foundations will need to be. I’ve been told they need to be 1 metre deep, but not how wide.
    Could anyone enlighten me on this, please?
    This will be a single storey extension on entirely flat ground.

    Asked by Adam on 11th Sep 2019
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    ian mccorquodale

    "The depth depends on what the ground is like you have to dig to solid ground.
    So if you have a solid ground like shallet you might only have to go down 450mm
    For a single storey building strip foundations will typically be 450mm wide and at least 200mm deep, and for two storeys 600mm wide and 200mm deep."

    Answered on 16th Sep 2019 - Member since Jan 2019 - report

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