It has just occurred to me that what may have been requested is one of those fancy electric Japanese toilet seats that has a “bidet” like facility. In that case, it probably isn’t interfering with common property but the Committee should still insist that a licensed plumber be used to install it. And if they don’t already have a by-law in place, they should pass one that says exactly that – all plumbing work must be carried out by a licensed and insured plumber. After all, they can do it with a simple majority vote.