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DIY Toilet Replacement: A Complete Step-by-Step Guide

By Justin Archer | January 27, 2025 | min read

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Ready to replace your wobbly, leaky, or outdated toilet? This comprehensive DIY guide walks you through every step of toilet installation, from preparation and removing the old unit to setting and securing your new toilet.

Learn how to replace a toilet yourself with this detailed step-by-step guide. Covers preparation, old toilet removal, new toilet installation, and testing, helping you save money on plumbing costs.

Is your old toilet wobbly, leaky, or just plain outdated? Thinking, “This has got to go!”? You’re not alone! Replacing a toilet might seem like a daunting task, but with the right guidance and a little elbow grease, it’s a project you can tackle yourself. This comprehensive guide will walk you through each step of how to install a toilet, ensuring you have the confidence to complete the job successfully and save money on plumbing costs.

Preparing for Your Toilet Installation

Before diving into the nitty-gritty of toilet removal, preparation is key. This not only makes the process smoother but also ensures your safety and the protection of your bathroom.

Shut Off the Water Supply

The first crucial step in any toilet replacement is to turn off the water supply to the toilet. Locate the shut-off valve, typically found on the wall or floor behind or beside the toilet. Turn it clockwise to stop the water flow to the toilet. This prevents any accidental flooding while you’re working.

Drain the Toilet

With the water supply off, flush the toilet to empty the tank and bowl. Since the water is off, the tank won’t refill. Use a plunger to force any remaining water down the drain line. Then, use a sponge and a bucket to remove any remaining water from the tank. Any small amount of water left in the bowl won’t spill out as long as you keep it upright during removal.

Disconnect the Supply Line

Using an adjustable wrench, disconnect the water supply line from both the water pipe and the toilet fill valve. If the line is old or hasn’t been removed in a long time, it might be stiff. Applying a penetrating catalyst like PB Blaster can help break down any corrosion. Be sure to keep the water pipes secure while loosening the connection to prevent damaging the wall or floor connections. Have a rag or bucket handy to catch any water that spills out of the supply line.

Removing the Old Toilet: A Step-by-Step Approach

With the prep work done, it’s time to remove the old toilet. This process can be broken down into a few key steps.

Separating the Tank and Bowl

If you’re working alone, it’s often easier to separate the tank from the bowl. Most toilets are two-piece units. Disconnect the tank by removing the bolts located at the bottom of the tank using an adjustable wrench. You might need to hold the top of the bolt inside the tank while removing the nuts below. Once the bolts are out, lift the tank straight up, twisting gently from side to side to free it from the bowl’s flush valve gasket.

Unbolting the Toilet Bowl

To remove the toilet bowl from the floor, start by removing the bolt caps with a screwdriver if necessary. Then, use pliers or an adjustable wrench to remove the nuts and washers that secure the bowl to the floor. If the nuts are rusted, use PB Blaster to loosen them. If they still won’t budge, a few turns will create enough space to cut them off with a hacksaw. Remember, your new toilet will come with replacement bolts.

Removing the Toilet Bowl

Carefully rock the toilet bowl back and forth to break the seal between the toilet and the floor. If there’s caulk around the base, use a utility knife to score through the seal. Be aware that caulking around the base of a new toilet is not recommended, as it can trap water from leaks. Once free, lift the bowl and set it aside to expose the old wax ring.

Addressing the Wax Ring and Flange

A wax ring creates a waterproof seal between the toilet and the drainpipe. Use a putty knife to remove the old wax ring, then clean any remaining wax with a damp rag or sponge. Stuff a rag into the open drain line to prevent sewer gases from escaping and to keep tools from falling in. Inspect the toilet flange located at the floor drain. If the flange is cracked or broken, you can use a repair ring or replace it. Take a picture of the damaged flange and consult with a plumbing professional for advice.

Installing Your New Toilet: A Detailed Guide

Now, the exciting part—installing your new toilet! This part requires some precision and care.

Preparing for Installation

Before placing the new bowl, place the new bowl bolts in the flange. Remove the rag from the drain pipe. You have two options for placing the new wax ring: you can attach it to the bottom of the bowl or place it directly on the flange. Attaching it to the bowl allows you to ensure it is in the proper position but the more popular option is to place it on the flange prior to lowering the bowl into place. The thickness of your floor will dictate the wax ring needed, especially if you have thick tile.

Setting the Bowl

Carefully place the toilet bowl onto the flange, aligning the bolt holes with the bolts. Hold the bowl by the inside rim for better control. Once aligned, press down to set the wax seal. Be careful not to move or tilt the toilet, which could break the seal.

Securing the Bowl

Secure the toilet by placing a washer and nut on each bolt. Tighten the nuts evenly, alternating from side to side, a little at a time. This distributes pressure and prevents loosening the wax seal. Be careful not to over-tighten and crack the porcelain. If the bolts are too long, cut off the excess with a hacksaw.

Attaching the Tank

Place the tank onto the bowl, aligning the bolts with the holes. Secure the tank to the bowl by tightening each bolt alternately until the tank comes in contact with the bowl. Be sure the gasket is properly seated. Reattach the water supply line to the fill valve and the water supply valve. Consider replacing the old supply line with a new one.

Testing for Leaks

Slowly turn on the water shut-off valve and allow the tank to fill. Flush the toilet and watch for leaks at the base and where the tank and bowl meet. Use leak-detecting dye if needed.

Attaching the Seat

Most two-piece toilets do not come with a seat so be sure and purchase a new one. Select a seat that fits your toilet model and secure it following the manufacturer’s instructions.

Why This DIY Toilet Install Guide Matters

This guide provides a structured approach to replacing a toilet, breaking down each complex step into manageable tasks. By following these instructions, you can ensure that the job is done correctly, avoiding common mistakes that could lead to leaks or other issues. Learning how to install a toilet yourself is a valuable skill that can save you money and give you a sense of accomplishment.

Actionable Tips and Comparisons

  • Penetrating Catalyst: Always have a penetrating catalyst like PB Blaster on hand to deal with stubborn, rusted connections.
  • Wax Ring Thickness: The thickness of your floor and any added layers like tile will affect the thickness of the wax ring you need to purchase.
  • Even Tightening: When securing the bowl and tank, always tighten bolts evenly to avoid cracking the porcelain.
  • Caulking: Avoid caulking around the base of the new toilet to allow leaks to be visible.

User Engagement and Storytelling

Imagine the satisfaction of successfully completing a project like this yourself. No more waiting for a plumber, no more hefty bills. You’ve taken control and saved money while learning a valuable skill. This isn’t just about fixing a toilet; it’s about empowering yourself with DIY skills!

Next Steps

Ready to start your toilet replacement project? Head over to our website and swipe right to rent the tools you need for this project! We offer high-quality tools that will make your job easier and more efficient.

FAQ Section

  1. Can I replace a toilet myself? Yes, with the right tools and guidance, replacing a toilet is a DIY project most people can handle.
  2. What tools do I need for a toilet replacement? You’ll need an adjustable wrench, a putty knife, a screwdriver, a plunger, a sponge, a bucket, and potentially a hacksaw and penetrating catalyst like PB Blaster.
  3. How do I choose the right wax ring? Consider the thickness of your floor and any added layers like tile when choosing the thickness of your wax ring.
  4. What do I do if the old toilet bolts are rusted? Use a penetrating catalyst like PB Blaster to loosen them. If they still won’t budge, cut them off with a hacksaw and replace them with new ones.
  5. Should I caulk around the base of the toilet? No, caulking can hide leaks and lead to serious damage.
  6. What do I do if the toilet flange is broken? Use a repair ring or replace the entire flange, depending on the severity of the damage.
  7. How do I prevent sewer gases from entering my home during a toilet install? Stuff a rag into the open drain line while working.
  8. How do I know if the wax ring is sealed correctly? The toilet should be secure and not wobble, and there should be no leaks.
  9. How do I tighten the bolts evenly? Alternate tightening the nuts on each side a little at a time.
  10. What if I still have questions about my DIY toilet install? Contact our customer support team, who can guide you through the process.

By following this comprehensive guide, you’ll not only replace your toilet but gain confidence in your DIY abilities. Remember to take your time, follow each step carefully, and don’t be afraid to ask for help when needed.