Economically unlikely, but technically possible. But in almost all the cases I have seen there was a strap beam provided to connect the footing to another. Cantilever footings are generally used at the periphery of the buildings where the columns are too close or on the periphery. Hence the columns has to be placed with considerable eccentricity. due to this eccentricity there are huge moments created at the base of the column which causes overturning effects. Hence to overcome these overturning moments a restoring moment/stabilizing moment is required to be produced, mostly by the self weight of footing and overburden soil over the footing. Since the cantilever footing is connected with a strap beam with another footing the moments are resisted by a combined effect of the self weight of both columns, footing and overburden soil pressure from both footings. In our case, considering there is no strap beam, the plan dimensions an