This is a leak pan device designed to prevent internal damage to cabinetry caused by faulty plumbing, and also by various kinds of construction debris. It is composed of two or more parts that fit adjustably together to form a pan that has a flat bottom and one or more raised edges to contain leakage, direct it in a prescribed course through a drain or depression in a raised edge, or both. The leak pan device is easily fitted and placed beneath plumbing under kitchen, bathroom and all other plumbing areas such that the leak pan contains leaking water thereby preventing damage including rotted wood, mold build-up and warped cabinet materials.