How to Replace an Old Toilet: A Step-by-Step Guide

Replacing an old toilet might seem like a big job, but with the right steps and tools, it can be a smooth DIY project—or one easily handled by a professional. In this guide, we’ll show you how to replace an old toilet efficiently while ensuring safety, cleanliness, and proper plumbing.

If you’re also wondering about how to install a toilet, check out our detailed tutorial here: Toilet Installation Guide.

 

When Should You Replace Your Toilet?

Before starting the replacement, ask yourself:

• Is the toilet constantly leaking or running? 
• Does it clog often? 
• Are there visible cracks in the bowl or tank? 
• Is it an older, inefficient model using more water? 

If you answered yes to any of these, it’s time for an upgrade.

 

Tools & Materials Needed

• New toilet (bowl + tank) 
• Wax ring 
• Adjustable wrench 
• Screwdriver 
• Putty knife 
• Plumber’s tape 
• New toilet bolts (if not included) 
• Gloves and cleaning supplies 
• Towels or sponge to soak remaining water 

 

Step 1: Turn Off Water Supply

Shut off the water supply valve behind the toilet. Flush the toilet to empty the tank and bowl. Use a sponge or towel to remove any leftover water.

 

Step 2: Disconnect the Water Line

Use a wrench to loosen the nut connecting the water line to the toilet tank. Place a towel underneath to catch any drips.

 

Step 3: Remove the Old Toilet

Unscrew the nuts holding the toilet to the floor. Carefully lift the toilet straight up and out. Old toilets can be heavy, so be cautious.

 

Step 4: Remove the Wax Ring

Scrape off the old wax ring from the floor flange using a putty knife. Check the flange for any damage—it should be intact and secured to the floor.

 

Step 5: Install New Wax Ring and Bolts

Place a new wax ring on the flange or under the toilet base (depending on model). Insert new closet bolts into the flange slots and make sure they’re evenly spaced.

 

Step 6: Position the New Toilet

Carefully lower the new toilet onto the flange, aligning the bolts with the holes. Once it’s seated on the wax ring, press down slightly to compress the ring and create a seal.

 

Step 7: Secure the Toilet

Tighten the nuts onto the bolts with a wrench—don’t over tighten or you may crack the porcelain. Install the bolt caps.

 

Step 8: Reconnect the Water Supply

Reconnect the water supply line to the tank. Turn the valve back on and let the tank fill. Check for leaks around the base and water line.

 

Step 9: Test the Toilet

Flush the toilet several times to ensure everything is working smoothly. Check for rocking or movement—if needed, use toilet shims for stability.

 

Bathroom Toilet Installation Tips

• Always replace the wax ring—don’t reuse the old one. 
• Make sure the flange is level and in good shape. 
• Hand-tighten nuts before using tools to prevent cracks. 
• For stubborn bolts, apply penetrating oil before removal. 

 

Need Help With Toilet Installation in Los Angeles?

At Derks Plumbing, we offer expert toilet installation and bathroom toilet installation services across Los Angeles. Whether you’re upgrading an outdated toilet or starting fresh, our professional team is ready to help.

Check out our full guide here:
How to Install a Toilet

 

Conclusion

Now that you know how to replace an old toilet, you can decide whether to do it yourself or call in a pro. It’s a manageable task if you follow the correct steps—but if you’d rather not risk leaks or installation errors, leave it to the experts at Derks Plumbing.

Need help today? Contact us for reliable, professional toilet replacement services in Los Angeles.

For more details read this blog ” How to install a toilet “