A toilet is the hardest-working fixture in the house, and sooner or later one of them cracks, runs all night, rocks on the floor, or simply drinks more water than it should.
The good news is that swapping it is a two-wrench job. There is no soldering, no pipe cutting, and nothing to open up behind a wall. The skills that actually matter are measuring the rough-in before you buy and setting a fresh wax ring straight.
This guide walks through how to replace a toilet in order: choose the right bowl, drain and pull the old one, set the new one without a leak, and spot the two problems (a dead shut-off valve, a broken flange) that turn a simple swap into a bigger call.
Key Takeaways
- Measure the rough-in first: from the finished wall (not the baseboard) to the center of the floor bolts. 12 inches is standard, but older bathrooms often run 10 or 14 inches, and the wrong number means the bowl will not sit against the wall.
- Drain the bowl completely: shut the supply valve, flush and hold the handle, then sponge or shop-vac the last water out of both tank and bowl before you lift.
- Fit a new wax ring every time: a compressed ring never reseals, so a reused one leaks water and sewer gas under the base. Never reuse the old one.
- Snug the closet bolts, never crank them: alternate side to side in small turns and stop the moment the bowl sits snug, and shim an uneven floor rather than tightening the rock out.
Can I Replace My Toilet Myself?
Yes, replacing a toilet is a standard DIY job that takes most people about 2 hours, needs no plumbing license, and involves no soldering or pipe work. You are undoing nuts, lifting porcelain, and seating a wax ring.
The real limit is your back, not your skill. Toilets are awkward objects weighing between 60 and 120 pounds, and a one-piece model puts all of that into a single lift. If that sounds like too much, split a two-piece into tank and bowl and carry them separately, or grab a helper.
Two situations do change the answer. If the shut-off valve behind the toilet is seized or weeping, or the closet flange under the old bowl is cracked, the job grows a second repair before you can set anything new. Both are covered below, and both are cheaper to spot now than halfway through.
How Do I Choose the Right New Toilet?
Match three things before you buy: the rough-in measurement, the seat height that suits the people using it, and the flush rating. Bowl shape and styling matter far less than a toilet that physically fits the drain you already have.
Check the Rough-In
Before you fall in love with a specific model, grab your tape measure. You need the “rough-in” distance: the distance from the finished wall (not the baseboard) to the center of the floor drain, usually hidden under a bolt cap.
The standard is 12 inches. Older homes, and a few newer ones, use a 10-inch or 14-inch rough-in instead. Measure from the bare wall, because measuring off the baseboard adds half an inch or so and quietly pushes you to the wrong model. Buy a toilet that matches the number you measured, or it will not sit flush against the wall.
Pick Standard or Comfort Height
Toilets come in two seat heights. Standard height sits about 14.5 to 16 inches from the floor to the seat, while comfort height (also called ADA height) sits 17 to 19 inches, roughly the height of a dining chair.
Comfort height is easier on the knees for taller adults and older users who struggle to lower and rise. Standard height keeps shorter people and small children with their feet flat on the floor, so it is often the better pick for a family bathroom. If the household spans both, the comfort-height bowl plus a step stool is the usual compromise.
Check the Flush Rating
If your old toilet predates the late 1990s, replacing it can cut your water use sharply. Toilets carrying the EPA WaterSense label flush with 1.28 gallons or less, about 20 percent under the 1.6-gallon federal standard. WaterSense estimates the average family saves close to 13,000 gallons and more than $170 a year by switching, roughly $3,400 over the toilet’s lifetime (1).
Low-flow does not mean weak, either. Modern 1.28-gallon bowls move waste with a bigger trapway and a faster rush of water rather than sheer volume, which is why the old advice about double-flushing a water-saver no longer applies to current designs.
One-Piece Toilet
One-piece toilets are molded from a single chunk of porcelain. Because the tank and bowl are fused, there are no gaskets to rot and no potential for leaks between the two sections. They also sit lower to the ground and offer a sleeker profile.
This Swiss Madison is a prime example of a modern one-piece design that eliminates crevices where dirt likes to hide.
The main downsides are price and weight. They are generally more expensive than two-piece models and much heavier to lift into place during installation, which matters if you are working alone.
Two-Piece Toilets
Two-piece toilets are the most common type found in American homes. They come in two boxes: one for the tank and one for the bowl. This makes them easier to move and install since you aren’t lifting the whole unit at once.
The trade-off is the connection point. You have to bolt the tank to the bowl using a rubber gasket. Over time, this rubber can perish and cause leaks, though it is a cheap fix.
Two-piece toilets are usually more affordable and offer a traditional look. This American Standard is a good example of the classic, reliable design most households already know.
Wall-Hung Toilets
Wall-hung toilets, or floating toilets, bolt directly to the wall frame, hovering above the floor. The water tank is usually concealed inside the wall cavity.
These work well in small bathrooms because they save floor space and make mopping underneath easy. Models like this Kohler model add an instant high-end hotel look to your home.
However, installation is complex. You need to open up the wall to install a carrier system, and the concealed tank means any future repair starts with an access panel. If you have limited plumbing experience, this is one job where calling a pro is recommended.
Take Note
Wall-hung toilets have a strict weight limit based on the carrier frame. If durability is your main concern, a floor-mounted toilet is generally the sturdier choice.
Macerator Toilet
Macerator toilets, or upflush toilets, are problem solvers. They use an electric pump and blades to liquefy waste and pump it up or sideways to your main soil stack.
This allows you to install a bathroom in a basement (below the sewer line) or an attic without tearing up the floors for new plumbing pipes.
Brands like Saniflo are the leaders here. Just be aware they are noisier than standard toilets, rely on electricity to flush, and need a nearby outlet you may not have.
How Do You Drain a Toilet Before Removing It?
Shut the supply valve, flush and hold the handle down, then sponge or vacuum out whatever water is left in the tank and bowl. It takes about 15 minutes and it is the difference between a clean pull and a soaked bathroom floor.
What You’ll Need
- Plunger.
- Sponge and bucket (or a Wet/Dry Vac).
- Old towels.
- Rubber gloves.
Step by Step
- Locate the water supply valve on the wall or floor behind the toilet and turn it clockwise to shut it off.
- Flush the toilet. Hold the handle down to let as much water as possible drain from the tank and bowl.
- Soak up the remaining water in the tank with a large sponge and wring it into your bucket.
- Use the plunger to force the remaining water down the bowl drain.
- Sponge out the last bit of water at the bottom of the bowl. If you have a Shop-Vac, this is the perfect time to use it.
How to Replace a Toilet
With the bowl empty, the job splits into two halves: getting the old toilet out without making a mess, and setting the new one so it never leaks.
How to Remove an Old Toilet
Having the right tools ready prevents mid-job panic.
What You’ll Need
- Old rag.
- Utility knife.
- Putty knife.
- Adjustable wrench.
- Hacksaw (optional, for stuck bolts).
- Disposal bags.
- Disconnect the water supply line from the bottom of the toilet tank using your adjustable wrench or pliers.
- Remove the caps covering the floor bolts. Unscrew the nuts using a wrench. If they are rusted shut, you may need to saw them off with a hacksaw.
- If you have a two-piece toilet, unbolt the tank from the bowl and remove it first to lighten the load.
- Use a utility knife to slice through the caulk seal around the base of the toilet. This DIYSELF set works well.
- Rock the toilet gently to break the wax seal, then lift it straight up and place it on a drop cloth or old newspaper.
- Scrape the old wax off the floor flange using a putty knife. It will be sticky and gross; this is normal.
- Stuff an old rag into the open sewer pipe immediately. This blocks sewer gases and prevents tools from falling down the hole.
Top Tip
Inspect the toilet flange (the plastic or metal ring on the floor). If it’s cracked or broken, use a flange repair kit now. A broken flange causes wobbly toilets and leaks.
Install the New Toilet
Now for the rewarding part.
What You’ll Need
- Adjustable wrench.
- Spirit level.
- Plastic shims.
- New wax ring (or wax-free seal).
- New water supply line.
- Caulk.
Prepare the Wax Ring
Remove the rag from the pipe. Place the new bolts into the flange slots.
You have two options for the wax ring: stick it to the bottom of the new toilet bowl, or place it on the floor flange. Most pros prefer placing it on the flange so they can ensure it’s centered.
Two details save a lot of grief here. First, check the flange height. It should sit about 1/4 inch above the finished floor, not level with it and not sunken, or the wax will not compress evenly and the bowl will rock. If a new tile floor buried yours, a flange extender ring brings it back up to height.
Second, match the ring to your bowl rather than grabbing whichever box is nearest. Tip the old toilet on its side, measure the elbow-neck opening on the bottom, and buy a ring of that width (2). A ring that is too narrow leaves a gap the water finds.
Set the Toilet
Lift the toilet bowl and position it over the flange. Align the holes in the base with the floor bolts. Lower it gently.
Once it touches the floor, do not lift it back up or you will break the wax seal and have to buy a new one.
Compress the Seal
Sit on the toilet backwards (facing the tank). Your body weight helps compress the wax ring evenly. Rock very slightly to settle it, but don’t overdo it.
Tighten the Bolts
Place the washers and nuts onto the floor bolts. Hand-tighten them first. Then, use a wrench to tighten them alternately, two turns on the left, two turns on the right.
Stop when they feel snug. If you overtighten, you will crack the porcelain base.
Level and Connect
Place a spirit level across the bowl. If it isn’t level, slide plastic shims under the low side until it is perfect. Trim the shims with a knife.
Install the tank (if it’s a two-piece) ensuring the tank-to-bowl gasket is in place.
Connect Water and Test
Attach the new water supply line to the fill valve and the wall stop. Turn the water on.
Flush the toilet and check for leaks at three points: the supply line connection, the tank bolts, and the floor base.
Keep an eye on the base for the next few flushes. If it stays dry, apply a bead of caulk around the base, leaving a small gap at the back to allow leak detection in the future.
How Do You Replace a Toilet Seat?
Pop the hinge caps at the back of the seat, undo the two bolts underneath, then set the new seat over the same holes and tighten the nuts by hand. It is a 10 minute job that needs one screwdriver and, sometimes, a wrench.
Most new toilets arrive with a seat in the box, so this mainly comes up when you are upgrading an older bowl or fitting a bidet seat.
What You’ll Need
- New toilet seat.
- Screwdriver.
- Wrench (maybe).
Step by Step
- Align the seat hinges over the holes in the bowl.
- Push the plastic bolts through the holes.
- Thread the nuts from underneath. Many modern seats have “top fixing” mechanisms that tighten entirely from above with a screwdriver.
- Tighten securely, but remember: it’s plastic, not steel. Don’t strip the threads.
Be Aware
Overtightening seat bolts is the number one cause of difficult removals later. Snug is enough.
What Should You Know Before You Replace a Toilet?
Four checks save the most grief: test the shut-off valve before you touch anything, consider a wax-free seal if you are nervous about wax, fit a new supply line rather than reusing the old one, and shim the base instead of tightening the bolts down onto an uneven floor.
Check Your Shut-Off Valve First
Before you do anything, test the shut-off valve behind the toilet. If it is old, it might be stuck or leak when you turn it. It is better to know this before you disconnect the toilet. If it fails, you’ll need to shut off the main house water to replace that valve first.
Use a Wax-Free Seal
If you are nervous about messing up the wax ring, buy a wax-free seal (like Sani-Seal or Perfect Seal). They are made of rubber or foam, can be repositioned multiple times if you don’t get the alignment right on the first try, and are much less messy.
Don’t Reuse Supply Lines
Flexible water supply lines have rubber washers that harden over time. When you disconnect the old one, buy a new braided stainless steel supply line ($5-$10). It is cheap insurance against a flooded house.
Use Shims Correctly
Shims are your best friend on uneven tile floors. Never try to tighten the bolts to force the toilet down to the floor; the porcelain will snap. Use these Multi-Purpose Nylon Shims to fill the gap, then caulk over them.
How Much Does a Plumber Charge to Replace a Toilet?
A plumber’s labor to swap a toilet on existing plumbing typically runs about $150 to $400, not counting the toilet itself, and a cracked flange that has to be replaced adds roughly $145 to $300 more.
Many plumbers also set a minimum call-out fee, so a simple swap often costs about the same as a slightly bigger job. That is worth knowing if you are weighing one toilet against having two done in the same visit.
You can trim the bill by removing the old toilet yourself and having the pro install only the new one, since disposal fees and haul-away time are billed separately. Get the price confirmed as labor plus parts before work starts, so a surprise flange or valve repair does not arrive as an unexplained line item.
FAQs
Replacing a Toilet Is Easier Than You Think
Swapping a toilet feels intimidating mainly because water damage is scary, but the job is really just a short, logical sequence: measure, drain the old bowl, set a fresh wax ring, and snug the bolts without cracking the porcelain.
Get the rough-in right before you buy, keep a sponge and bucket within reach, and stop tightening the moment the bowl sits firm. Do that and you can finish in a single afternoon, keep the $150 to $400 you would have handed a plumber, and know exactly how your bathroom is put together the next time something needs a look.
