Retrofit drain apparatus and method of installation

A removable shower drain comprising:

• a grill grate comprising at least one aperture and at least one grill grate first fastener opening configured to receive a first fastener;
• and
• a support flange configured to support the grill grate and configured to be coupled to an existing shower drain, the support flange having a central opening and comprising a recessed flange extending into the central opening from an interior wall for the support flange and on which the grill grate can be accommodated, at least one first support flange fastener opening configured to receive the first fastener, and at least one second support flange fastener opening configured to receive a second fastener;
• wherein the grill grate is configured to be detachably coupled to the support flange by the first fastener and wherein the support flange is configured to be detachably coupled to a structure of the existing shower drain by the second fastener;
• and
• wherein the support flange allows a new tile to be installed directly on top of an existing tile and raises a floor slope to be leveled with the support flange.