In an old island house a toilet problem becomes a floor problem faster than it does anywhere else, because of what is underneath it.
Corroded flanges and old floors
Cast iron closet flanges in the older cottages corrode, the toilet starts to rock, and the seal fails. Water then goes into heart pine subfloor rather than down the drain. On original flooring, a wobble is not a minor annoyance — it is damage happening quietly.
Non-standard rough-ins
Older island bathrooms often have measurements that no longer match standard modern fixtures. That is solvable, but it is why a straightforward-looking replacement sometimes is not.
Salt air on the fittings
Supply lines, shut-off valves and floor bolts corrode faster here. If yours are original and looking rusty, replacing them during a routine visit costs very little and prevents an awkward failure later.
The quiet running one
Water trickling into the bowl between flushes means the flapper or fill valve has stopped sealing. Inexpensive to fix, and easy to miss in a house with more than one bathroom.