I am installing a replacement bathtub. I've decided that I need to slightly lengthen my overflow pipe, and it would be kind of nice to be able to inspect that area well for leaks, before I put up the replacement wallboard and tile.
The other side of the wall behind the bathtub plumbing is a towel closet. I was considering the idea of cutting a square access panel in the sheetrock, at approximately where I've marked the picture with a red rectangle.
Are there any building code regulations I should be concerned with? And is this generally a good/bad idea? Are there best practices?
This is in the southern U.S.