A professional licensed plumber typically charges between $300 and $800 in total labor fees to replace a concealed shower mixing valve body behind the wall, depending on accessibility and whether existing copper pipes need to be cut or soldered. If the replacement requires cutting open finished drywall and patching it afterward, total project costs can range from $800 to $1,500+ including parts and wall repairs. Verification: Test the newly installed valve through multiple temperature and pressure cycles to confirm zero leaks.
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