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Sort out party wall agreements with adjoining owners and anyone within 6m, dig down minimum 1.0m depth (maybe more depending on ground condition ands roots) in one bay, definitely dont lever up, fill with ballast and concrete, leave for 24hrs, dry pack to U/S of existing footing, repeat in 1m bays in a hit-and-miss sequence for the full perimeter
leggy_blonde
@NotThamesWater
Although underpinning would be a pretty easy DIY (though not to any level that an insurer might approve of).
Dig down, lever up, fill with ballast and concrete.