Replacing a bathtub can seem like a daunting task, but with the right planning and tools it can be accomplished by a skilled DIYer. A bathtub replacement project will take time and effort, but the results are well worth it when you can enjoy a brand new tub. This comprehensive guide will walk you through all the steps for How to Replace a Bathtub safely and effectively.
Reasons to Replace a Bathtub
There are several reasons you may need or want to replace an existing bathtub:
- Worn out surface – Over time with repeated use and cleaning, bathtub surfaces can become dulled, scratched, stained and worn down. Replacing it can restore the shiny, fresh look.
- Outdated styles – Tub designs come in and out of fashion like anything else. Swapping in a new tub can update the whole look of your bathroom.
- Changing needs – If you have mobility issues, a walk-in bathtub or one with grab bars may be necessary. For young kids, a slip-resistant surface is safer.
- Leaks – Cracks, chips and holes that cause leaks mean a tub has reached the end of its lifespan. Repairing leak damage is often more work than replacing.
- Discoloration – Porcelain tubs can yellow over time. Fiberglass or acrylic tubs can stain and discolor permanently despite cleaning efforts.
- Clogged jets – Bathtubs with jetted hydrotherapy systems can have trouble with mineral buildup that blocks the jets. Easier to replace than repair.
- Resale value – Bathrooms and kitchens are top selling features in homes. Upgrading the bathtub can greatly boost property value.
Bathtub Types
There are several different types of bathtubs to consider when replacing your existing model:
Cast Iron Bathtubs
- Durable and long lasting material
- Traditionally styled with elegantly sloped sides and ends
- Excellent heat retention to keep bathwater warm
- Prone to chipping if hit hard by objects
- Very heavy (200+ lbs), difficult to maneuver
- Must be set on a flat, supported, level floor
Acrylic Bathtubs
- Lightweight plastic composite material
- Many styles and sizes available
- Scratch resistant surface
- Affordable option
- Warmer to the touch than porcelain
- Can stain or discolor over time
- Moldable structure makes customized sizes possible
Fiberglass Bathtubs
- Lightweight but durable fiberglass reinforced plastic
- One piece seamless construction
- Available in variety of colors besides white
- Scratches may cause underlying fibers to show
- Can flex slightly over time
- Seams where pieces join can leak if not properly sealed
Porcelain Enameled Steel Tubs
- Porcelain surface coated over steel base
- Durable but can chip, exposing metal underneath
- Many antique reproductions available
- Often built with an apron front
- Prone to showing rust stains from bottom steel
- Slipperier surface than textured tubs
Copper Bathtubs
- Beautiful shiny copper material
- Naturally antibacterial and antimicrobial
- Expensive upfront cost
- Scratches easily from cleaning and use
- Requires careful sealing to prevent water stains, corrosion
Walk-In Bathtubs
- Door allows stepping directly inside rather than over wall
- Built-in seat and grab bars provide needed support
- Frequently jetted for therapeutic soaking
- Special consideration for waterproof door seals
- Much heavier than standard tubs
- More expensive than standard tubs
Corner Bathtubs
- Shaped to fit snugly into corner area
- Allow positioning in smaller bathrooms
- Limited reclining area due to angles
- Can be either right or left draining orientation
- Measure carefully to get proper fit
How to Measure for a New Bathtub
Before purchasing your bathtub replacement, precise measurements of your bathroom’s available space are crucial.
Materials Needed
- Tape measure
- Pencil
- Paper or notebook
- Cloth measuring tape (flexible)
Measurements to Take
- Length, width and height of existing tub enclosure
- Distance from surrounding walls to tub edges
- Location of existing plumbing fixtures and pipes
- Location of doorways and windows
- Amount of clearance space around tub area
Special Considerations
- Alcoves vs freestanding tubs
- Corner tub configurations
- Built-in vs drop-in tub design
- Access to tub controls and faucets
Measure carefully and double check your measurements. Having accurate numbers will ensure a properly fitted new bathtub and smooth installation. Consider making a simple drawing of the layout as well for reference.
How to Remove an Old Bathtub
Once you have the new replacement tub purchased, it’s time to get rid of the old one. This is often the most physically demanding part of the whole project.
Materials Needed
- Goggles
- Flat pry bar
- Claw hammer
- Utility knife
- Wheelbarrow
- Shop vacuum
- Bucket
- Old towels or drop cloth
Drain Removal
Start by prying off the drain cover and unscrewing the drain shoe and connecting pipes underneath. Place a bucket under the exposed drain to catch any water still in the trap.
Remove Enclosure Surround
Use the pry bar to gently remove any surrounding shower walls, enclosure panels, or surround materials. Pry against the seams or use a utility knife to cut caulking. Watch for nails.
Detach Plumbing Connections
Locate the supply lines, overflow pipe, and p-trap connected to the tub and disconnect everything. Cap or plug any open pipes that will not immediately be reconnected.
Break Seal & pry Tub Loose
Use a pry bar to break the seal between the tub and the floor. Place strips of wood under the bar to prevent gouges. Apply force around the perimeter of the tub to loosen it completely.
Remove Tub
Lift the loosened tub up off the supporting ledge or base. This will likely take 2+ people depending on weight and awkward angles. Slide it out and carry it away.
Remove all old caulk remnants, glue, and adhesive from the exposed surround and walls so new materials can form a smooth seal. Vacuum up any debris.
Preparing the Tub Replacement Area
With the old bathtub removed, inspect the newly exposed plumbing lines and surrounding surfaces closely. Take steps to get the area ready for the new tub.
Materials Needed
- Tub surround repair materials
- Sandpaper
- Wood shims
- Construction adhesive
- Level
- Piping material
- Fittings
- Emery cloth
Inspect Drain Location
Ensure drain pipe size, location and height will match up with new tub specifications. Adjust drain height as needed with an elbow joint.
Check Level Surface
Use a level on the floor area the new tub will sit on. Fill any dips or uneven areas with floor leveling compound so the base is flat and supported.
Repair Surround Areas
Fix any damage spots on walls. Replace drywall, re-tile, or seal gaps as needed so surround is ready for new tub.
Adjust Plumbing Lines
Extend or realign supply and drain pipes based on measurements of new tub. May require cutting pipe, adding couplings, or installing new drain shoe.
Sand Away Bumps
Smooth and sand any rough spots or protrusions on the floor or wall surround that could interfere with tub fitting flush.
Preparing the install area properly will result in an easier installation and better fit for the new bathtub.
How to Install a New Bathtub
Once you have prepped the install area, it’s time to put in the new bathtub. Have any needed plumbing parts and tools ready to go.
Materials Needed
- Tub shims
- Sealant caulk
- Plumber’s putty
- Construction adhesive
- Silicone caulk
- Tub surround material
- Drop cloths
Position Tub
Lift the new tub into place. Have helpers to hold it steady. Check that tub lip aligns with ledge or base flush.
Level the Tub
Use a level on the tub rim to check it is even. Place shims underneath any low spots and check again until level.
Secure the Tub
Run a bead of construction adhesive around the base perimeter. Carefully set tub down into the adhesive and let dry per directions.
Connect Drain
Coat drain threads with plumber’s putty, insert into shoe and tighten. Attach p-trap and overflow pipes. Test for leaks.
Hook Up Supply Lines
Attach hot and cold supply lines to the faucet fixtures. Tighten securely but carefully to avoid cracking porcelain.
Seal Tub Edges
Run a caulk bead around the tub where it meets walls, ledges, surround. Smooth out the caulk with a wet fingertip. Let dry.
Replace Tub Surround
Reinstall any removed surround materials like shower walls, tiles, or enclosure pieces. Follow product directions.
Let all caulk and adhesives cure fully before using new tub. Enjoy your fresh bathtub replacement!
FAQs about Replacing a Bathtub
Some common questions that arise regarding replacing a bathtub:
How long does it take to replace a bathtub?
For an experienced DIYer, expect the bathtub replacement project to take 2-3 full days between removal, prep, install, and surround work. Hiring a professional can shorten the time frame.
Can I replace just a bathtub without the surround?
The tub and surround components (tile, walls, etc) are designed to fit together. It’s recommended to replace the whole surround for proper sealing.
What tools do I need to remove an old tub?
A pry bar, claw hammer, reciprocating saw, and safety gear like goggles are minimum requirements. Also useful are a utility knife, shop vac, bucket, and old towels.
Can I replace my tub with a walk-in model?
Yes, just ensure the new walk-in tub will fit the existing space. The door clearance and sealed threshold may require some surround modification.
Should I update my plumbing before or after installing new tub?
Replacing supply pipes and drains/traps beforehand allows connecting to new tub at proper heights.
Is it cheaper to replace a tub or reglaze an old one?
Tub replacement costs more for materials and labor vs reglazing. But replacement lasts longer before needing updates again.
How do I get a cast iron tub out in one piece?
Removing a cast iron tub without breaking it is extremely difficult. Easier to demolish and haul away in pieces.
Let the experts handle this heavy job.
Can I install a new bathtub myself?
With some plumbing knowledge and help lifting, an experienced DIYer can tackle a tub replacement themselves. Otherwise hire a professional.
How much does it cost to replace a bathtub?
Estimated costs for just the bathtub alone range $200-$1000 depending on type and features. With removal labor, surround repair, added plumbing – expect $2000-$5000+ for the whole project.
Conclusion
While certainly not quick or easy, installing a new bathtub can provide many years of enjoyment and convenience. Carefully planning all the steps, from measuring the space to prepping the area and finally fitting the new tub, helps ensure success. Certain specialized models like walk in tubs or elaborately tiled surrounds may require professional expertise. But for many standard tub replacements, an ambitious DIYer can tackle this project with proper preparation and persistence. Just take it slow, follow all safety advice, and don’t be afraid to call in backup if needed. Soon you’ll be relaxing in your fresh, new bathtub!