Toilet rough-in is the distance from the finished wall behind the toilet to the center of the drain opening. On many installed toilets, the floor bolts provide a visible reference for that center. Measuring from thick baseboard can make the available distance look shorter.
Record the wall and bolt locations
Measure from the finished wall surface to the bolt center if the bolts are visible. If the toilet is skirted or has an unusual mounting system, ask the installer to confirm the dimension. Note any side wall, vanity, or door that limits the space.
Compare with the manufacturer’s drawing
Check the model’s rough-in requirement and overall depth. A toilet can match the drain location and still interfere with a door or leave little room near the supply valve. Have the installer verify both the drain location and clearances before you order.
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