1. It wobbles, so the sink gets blamed
1.This is the complaint that fills plumbing forums, and it has been the same complaint for twenty years. Somebody leans on the rim, the basin rocks or eases away from the wall, and the assumption is that the ceramic is warped or the pedestal is the wrong height.
2.It almost never is. A pedestal sink is a wall-hung fixture with a column underneath it. The column takes downward load and hides the trap. It does nothing at all about the forward pull that happens every time somebody puts their weight on the front edge, and that load has to go into timber blocking or a proper bracket fixed to studs. Drywall anchors alone eventually let go, and when a fully loaded basin lets go it does not survive the floor.
3.The fix is a piece of 2x6 let in between the studs before the wall is closed up, with hanger bolts or the bracket landing in solid wood. On a retrofit that means opening a hand-sized patch of drywall, which is exactly the job the installer was hoping to avoid. Say it on the shelf edge and on the pick ticket, not in small print inside the carton, because by the time the carton is open the wall is already painted.
2. The faucet was bought before the sink was measured
Ceramic is drilled before it is fired. A single-hole basin will never accept a two-handle 4 in. centerset faucet, and no amount of goodwill at the counter changes that. Yet faucets and sinks are usually bought on separate trips, often by different people on the same job.
Two things reduce this. Put the drilling in the shelf label and the web title rather than only in the spec tab, so somebody scanning fifteen listings sees it. And carry the same body in both drillings where you can. Single hole moves in new build and in anything sold on looks; 4 in. centerset still moves steadily in older housing stock where the customer is matching what came out. Stocking one and not the other sends half the traffic down the road.
3. The drain does not match the overflow
Almost every rectangular pedestal basin has a front overflow. It needs a pop-up assembly with the side ports open so the overflow channel can actually discharge. Sell it with a grid drain or a sealed non-overflow pop-up, which is what a lot of vessel-style trim is, and the overflow becomes decorative. Water reaches the rim, backs into the channel and finds a way out through the joint instead.
The customer reports a leaking sink. Nothing is leaking. Pairing the right drain at the point of sale takes ten seconds and removes a whole category of callback.
4. Everything under the basin is on display
The reason people choose this fixture is the reason it causes trouble at the end of the job. There is no cabinet door. The stops, the supply risers and the trap are all visible from the doorway, and builder-grade parts look like builder-grade parts under a white gloss basin.
Big-box retailers worked this out and now sell finished pedestal trim kits, matched stops, risers and a P-trap in chrome or a dark finish, at a price close to the sink itself. Independent counters often do not stock them, so the customer buys the sink from you and the visible half of the job from somebody else. That is an easy attachment sale to lose twice over.
Put it on the shelf, not in the manual
-Drilling and rim height on the shelf label, not buried in the spec sheet.
-A one-page install note in the carton: blocking required, hanger bolts into solid timber, shim the column, do not rely on caulk.
-Pop-up with overflow and a finished trap kit merchandised beside the sink, not two aisles away.
-Basin-only and pedestal-only spares held in depth, so a chipped column is a component swap rather than a returned set.
Three of these four pedestal sink installation problems are solved with a label, a leaflet and a bit of shelf planning. The fourth, drilling, is decided months earlier when the container is ordered, which is where a supplier who runs both drillings on the same body earns their place.
