Replacing a toilet is one of the most approachable plumbing projects a homeowner can tackle. The tools are simple, the parts are standard, and the process is straightforward. It is also a project where details matter — a poorly set toilet leaks at the base, sending water into the subfloor where it causes invisible, expensive damage.
Removing the Old Toilet
Shut off the supply valve. Flush and hold the handle to drain the tank and bowl. Sponge or vacuum remaining water. Disconnect the supply line. Remove the closet bolt caps and nuts. Rock the toilet gently to break the wax seal, then lift straight up. Plug the open drain with a rag to block sewer gas.
The most critical step that separates a leak-free installation from a future problem is the flange inspection. Many homeowners skip this because the flange is not visible during normal use and is only accessible when the toilet is removed. But a damaged flange — cracked, corroded, sitting below the finished floor level, or with broken bolt slots — cannot create a proper seal no matter how carefully the new toilet is set. The few minutes spent inspecting and repairing the flange prevent the slow, invisible leak that sends water into the subfloor with every flush.
Wax-free gaskets (like Fluidmaster’s Better Than Wax) are gaining popularity over traditional wax rings because they are repositionable during installation, do not deform if the toilet is rocked during setting, and can be reused if the toilet needs to be removed and reset. Traditional wax rings work perfectly when compressed correctly in a single setting — the choice between the two is largely a matter of installation confidence and preference.
Inspect the Flange
With the toilet removed, inspect the closet flange — the ring connecting the toilet to the drain pipe. It should be flush with or slightly above the finished floor. A broken, cracked, or low flange must be repaired before setting the new toilet. Flange repair kits and extenders are available at any hardware store. This step prevents the most common toilet leak.
Setting the New Toilet
Install a new wax ring on the flange with the tapered side facing down. Lower the toilet onto the flange, aligning bolt holes. Press down firmly to compress the wax ring. Alternate tightening the closet bolt nuts — left, right, left, right — snugging gradually. Do not overtighten. Porcelain cracks. Reconnect the supply, turn on water, flush several times, and check the base for moisture. If dry, caulk around the base.
Where To Start
- Inspect the flange before setting the new toilet. A damaged or low flange will not seal. Repair or extend it first.
- Alternate tightening and do not overtighten. Left, right, left, right. Snug gradually. Porcelain cracks under excess pressure.
- Check for leaks after multiple flushes. Confirm the seal before caulking the base.
Replacing a toilet builds real confidence. The first time takes a couple of hours. The satisfaction of a solid seat, no leaks, and a clean installation is the kind of self-reliance that carries into every project after.
Have you ever replaced a toilet yourself — or has it always felt like something only a plumber should handle?