How to Install a Wall-Mounted or Pedestal Sink

Swapping out a sink is one of the most satisfying bathroom upgrades you can tackle yourself—it changes the whole feel of the room without requiring major structural work. Wall-mounted and pedestal sinks are cleaner looking than vanity cabinets, give you more floor space, and are easier to clean around. The real trick isn't plumbing complexity; it's getting the mounting bracket bolted securely to the studs so the sink won't sag or shift. Both sink types hang from the wall (a pedestal just provides visual support and stability at the base), so the installation sequence is the same: shut off water, disconnect the old setup, mount the bracket, hang the sink, and reconnect supply and drain lines. This guide walks you through it in a way that prevents the most common failure—a bracket bolted only to drywall instead of solid framing.

1. Kill the Water Pressure. Locate the shut-off valves under the sink (usually on the wall or under the floor). Turn both the hot and cold supply valves clockwise until they stop. Turn on the faucet to release any remaining water pressure in the lines. If you can't find individual shut-offs or they won't close fully, shut off the main water supply to the house.
2. Free the Supply Lines. Place a bucket under the connections. Unscrew the flexible supply lines from the faucet inlet ports using an adjustable wrench. If the lines are permanently soldered copper, you'll need a tubing cutter and will have to solder new connections later. For this reason, flex lines are the smart choice here. Unscrew the lines from the wall shut-off valves as well and set them aside.
3. Disconnect the Drain. Place a bucket under the trap assembly. Loosen the slip nuts connecting the P-trap to both the wall drain stub and the tailpiece coming down from the sink using a pipe wrench or adjustable wrench. Lower the P-trap away carefully (water will spill, so the bucket matters). If there's an overflow line from the sink to the drain, disconnect it as well.
4. Lift Out the Old Sink. For a wall-mounted sink, remove any bolts or brackets holding it to the wall, then lift the sink up and away from the wall. For a pedestal sink, unbolt the pedestal from the floor first, then remove the wall mounting bolts. You may need a second person to safely support the sink weight as you release it. Have towels ready—trapped water will spill.
5. Find the Wall Studs. Use a stud finder to mark the wall studs in the area where the new sink will mount. The mounting bracket holes must align with solid wood—do not install into drywall only. Most sinks come with a template; tape it to the wall at the correct height (usually 30-32 inches from the floor to the rim). Mark the bracket holes through the template, then verify each hole mark hits a stud with the stud finder. If holes don't align with studs, adjust the template height or horizontally until they do.
6. Bolt the Bracket Home. Drill pilot holes at your marked locations using a drill bit slightly smaller than your mounting bolts. Drill straight through the drywall and into the stud. Insert the mounting bracket bolts (usually 5/16-inch diameter for wall-mounted and pedestal sinks) through the bracket holes and into the stud. Tighten bolts hand-tight first, then use a wrench to fully tighten until the bracket is solid and cannot move. Do not over-tighten; you want snug, not crushed.
7. Hang the New Sink. Lift the new sink carefully—have a helper steady it—and line up the mounting holes on the underside of the sink with the bracket studs. Lower the sink down and thread the mounting bolts through the sink's pre-drilled holes. Tighten these bolts snugly to secure the sink to the bracket. For pedestal sinks, also install the pedestal to the floor, using anchor bolts if required by the manufacturer.
8. Install the Drain Trap. The tailpiece (drain line coming from the sink) should sit about 1.5 inches above the wall drain opening. If it's too high or low, adjust the sink position slightly or trim the tailpiece. Slide the P-trap's upper slip nut over the tailpiece and tighten to the trap body. Slide the lower slip nut over the wall drain stub and tighten. Hand-tighten first, then use a wrench for a quarter-turn more. Do not over-tighten—you'll strip the plastic threads.
9. Hook Up the Water Lines. Thread the flexible supply lines through the wall opening (if they aren't already in place) and connect them to the faucet inlet ports under the sink. Hand-tighten, then use an adjustable wrench to snug them—about one full turn past hand-tight. Connect the opposite ends to the shut-off valves on the wall, again hand-tight plus one wrench turn. Ensure lines aren't kinked or pinched by the sink basin.
10. Spot Leaks Early. Turn on the main water supply or the individual shut-off valves slowly. Let water run at both the hot and cold taps for 30 seconds, then turn them off. Check every connection—faucet inlet ports, P-trap slip nuts, wall shut-offs—for drips or slow weeping. If you see water, immediately shut off the supply and tighten the leaking connection another quarter-turn. Let it sit for 5 minutes, then check again. Repeat as needed until all joints are dry.
11. Seal All Gaps. If there are gaps between the sink rim and the wall, apply 100% silicone caulk (or use paintable caulk if you're finishing the wall afterward). Run the bead smoothly and wipe excess with a damp cloth before it dries. For pedestal sinks, caulk where the pedestal meets the floor to prevent water from pooling underneath. Do not caulk the drain connections—you need access to them later.
12. Install the Faucet. If your new sink did not come with a faucet, install one now before final water testing. Follow the faucet manufacturer's instructions to mount it to the sink deck. Connect its hot and cold lines to the supply lines you just hung. Tighten all connections hand-tight, then snug with a wrench. Turn water back on and test for leaks.