The Plumbing Checklist Every Bathroom Remodel Needs

Whether you’re dreaming of a spa-like retreat or just updating a dated bathroom, remodeling is the perfect time to address what’s behind the walls—not just what’s on them. Plumbing upgrades can improve water flow, prevent future issues, and make your bathroom more efficient for years to come. Use this simple bathroom remodel plumbing checklist from Niebuhr Plumbing, Heating, and Air Conditioning to make sure no critical detail is overlooked before construction begins.

Shut Off Valves

Make sure you have easily accessible shut-off valves for the toilet, sink, and shower. If your home doesn’t already have them, now’s the time to add them.

• Check if current valves work
• Replace old or corroded valves
• Add shutoffs where missing

Fixture Updates

New fixtures are often the centerpiece of a remodel—but behind the scenes, connections matter just as much.

• Confirm faucet, shower, and toilet selections early
• Match fixture types to plumbing layout (e.g., wall-mounted vs deck-mounted)
• Upgrade to water-saving models when possible

Drain Line Sizing

Next step on the bathroom remodel plumbing checklist is to check drain lines are properly sized to handle your fixtures and prevent clogs.

• Ensure correct pipe diameter for sinks, showers, and tubs
• Consider upsizing shower drains if adding multiple heads or rain showers
• Relocate drains only if necessary (to reduce cost and complexity)

Proper Venting

Vents allow air into your plumbing system so water drains smoothly.

• Confirm all fixtures are properly vented
• Add new vents if moving fixtures or adding a bathroom
• Poor venting can cause slow drains and bad odors

Pressure Balancing Valves

Nobody wants scalding water when someone flushes the toilet.

• Install pressure balancing or thermostatic valves in showers
• Prevent sudden changes in water temperature
• Especially important in homes with older plumbing

Pipe Insulation

Reduce energy waste and speed up hot water delivery.

• Insulate hot water lines
• Insulate cold lines to reduce condensation
• Especially helpful in basement bathrooms or exterior walls

Accessibility Considerations

Think ahead—what works now should still work 10 years from now.

• Choose fixtures that are easy to use
• Plan for grab bar support, if needed
• Consider hand-held shower options for flexibility

Code Compliance

Bathroom plumbing must meet local codes for safety and performance.

• Hire a licensed plumber to pull necessary permits
• Use code-approved materials
• Ensure proper slope for all drains and vent lines

Final Leak Check

Before closing walls, double-check all connections.

• Pressure test water lines
• Fill and test drains for leaks
• Take photos of plumbing rough-ins for future reference

At Niebuhr, we help homeowners across La Crosse and the Coulee Region plan remodels that are just as functional as they are beautiful. Whether you’re moving a tub or just swapping a vanity, we’ll make sure everything behind the walls is done right.

Planning a remodel? Let us help. Call 608-782-1700 or request a service online to get started.