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We have a TIK — & converted the tub space in 2003 to a full bath (30″ x 84″, that adjoins a bearing wall). The kitchen part is a U-shaped space surrounding the bath — which we want to renovate now. The entire kitchen (with bath) and bath walls sit on the same subfloor, and finished floor leval of kitchen & bath sit one inch above the rest of the ground floor. The kitchen part of the subfloor has considerable water damage on the far side by the sink & dishwater.

I want as part of a new reno to replace the kitchen floor & replace a portion of the kitchen subfloor as needed AND bring the kitchen floor level down to match the floor level of the ground floor (lower 1 in.) BUT leaving the newer tiled bath floor at its current level (1 in higher).

Question: Is this feasible: Since the bath interior partitions (and bath floor) sit on the same, continuous subfloor, can the the kitchen portion of the subfloor be cut out and replaced, leaving the bath walls and floor undisturbed? How much work is this? How expensive? Any tips for technique?