Digging footing alongside existing wall

17 Aug 2014
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United Kingdom
I have a single brick wall, 4 meters high, 5.6 meters long which I need to put a new strip footing alongside of.

The footing is around 5 bricks deep, but my new footing needs to be 1m deep, can I dig out the the whole way in one go? Or will it have to be done in sections?

The soil underneath the footing is clay
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Do it in sections. I was once called out to house that needed underpinning, the builder had excavated to existing footing level alongside the wall in an effort to speed things up so the underpinning could be done quicker in sections, but before he even started to dig out a section the footing now unrestrained one side slipped and the wall collapsed! What you propose is worse as the wall could quite simply collapse into the adjacent trench.
The question you need to ask of whoever designed this is "will a foundation laid in sections, experience differential settlement or movement?"
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not to mention the plain risk of excavating so far beyond the depth of the walls footings. How close are you digging

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