Extending concrete foundations

8 Feb 2005
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United Kingdom
I am about to rip down an old shed in a the garden and replace it with a new one. There are already concrete foundations measuring 13' by 7'. I would like to put a shed up that is 14' or 15' by 8'. I therefore need to extend the concrete base. Given that the shed will not weight that much can I just lay some more concrete alongside the existing stuff or will i need to add rods or something into the existing concrete to give it something to 'bond' on to?
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What you could do is to dig carefully under the ex-concrete base approximately 200mm underneath so it will give a extra support with the new base.

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