Yes, professional plumbers can and do replace water-damaged subfloors under a toilet if long-term leaking from a failed wax ring or supply line has caused structural wood rot. However, some specialized plumbers may focus strictly on piping and fixtures, requiring a general carpentry contractor to handle subfloor framing repairs. If the plywood or OSB subfloor is spongy or compromised, replacing it is vital to restore structural stability. Verification: Inspect the exposed subfloor area after removing the toilet to ensure the wood framing is solid and dry.
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