another view

Gina... does your back garden not stretch as far as that taller fence...in other words, does it end at the edge of the patio ?

my garden ends at the lighter color fence at the back the fence around the patio was put there by previous owners and it is subsiding as was a botched up job in 1st place by them so when it will get lawned it will need footings etc etc

Ah that makes sense.... I'm glad to know your garden goes to the far fence..
yes, you'll need to examine the ground to see what subsidence is likely to occur...