Plumbing Checklist for New Homebuyers: A Smart & Stress-Free Inspection Guide

Buying a home is a big deal—like, life-changing big. And while the fresh paint and cozy fireplace might be calling your name, there’s something less glamorous you absolutely need to check before signing those closing papers: the plumbing.

A well-done plumbing inspection can save you from surprise floods, water damage, or outrageous repair bills down the road. So, to help you move into your new place with confidence, we’ve put together a practical and thorough plumbing checklist based entirely on expert guidance and your detailed research.

Let’s walk through everything you should inspect—room by room—so you can spot red flags before they become wallet-crushing problems.

Why a Plumbing Inspection Matters

Plumbing problems don’t always announce themselves with bursts and leaks. Often, they’re sneaky—dripping silently behind walls or slowly clogging your drains. That’s why new homebuyers should always do a proper plumbing inspection.

Here’s what a good inspection helps you do:

• Spot small issues before they become emergencies
• Prevent water waste (hello, lower utility bills!)
• Avoid unexpected repair costs after move-in
• Maintain a healthy, mold-free living space

Your plumbing checklist is your first line of defense.

The Essential Plumbing Checklist for New Homebuyers

This list is broken down by area so you don’t miss a thing. Bring a notepad (or your phone) and take pictures or notes as you go.

Bathroom

Bathrooms are ground zero for plumbing issues. You’ve got multiple water sources in a small space—faucets, drains, toilets—and a single leak can cause major headaches.

What to check:

• Faucets: Look for leaks, drips, and low water pressure. Clean or replace aerators if the spray is off.
• Drains: Slow drains can signal clogs. Test all sinks, tubs, and showers.
• Toilets: Remove the tank lid and flush. Check for continuous running (a flapper issue) or leaks at the base (could be a worn wax ring).
• Caulking: Make sure there are no gaps in the seal around tubs or showers. Bad caulking can lead to water damage behind walls.

Pro tip: To detect a sneaky toilet leak, add a few drops of food coloring to the tank. If the bowl water changes color without flushing, you’ve got a leak.

Kitchen

The kitchen’s plumbing system gets a workout every day, especially with dishwashers and disposals in the mix.

Your kitchen plumbing checklist should include:

• Faucets: Watch for leaks or wobbly bases.
• Sink Drain: Check the P-trap and strainer for signs of leaks or corrosion.
• Garbage Disposal: Run it. Listen for unusual noises and look for leaks at the drain connection.
• Dishwasher: Watch a cycle. It should fill and drain properly without water pooling.
• Refrigerator Water Line: Look for cracked hoses or filters that need changing.

Laundry Area

Laundry rooms are often tucked away, making them easy to overlook. But a burst hose here can flood an entire basement.

Inspect these key parts:

• Washer Hoses: Look for bulging, brittleness, or signs of wear.
• Connections: Make sure the valves shut off completely and aren’t leaking.
• Drainage: Check the washing machine trap for debris and make sure the drain works.

Outdoor Plumbing

Exterior systems matter too, especially in cold-weather climates.

Don’t forget to check:

• Hose Spigots: Turn them on and off. Look for drips or cracks.
• Gutters and Downspouts: Clear any blockages to prevent water pooling near your foundation.
• Irrigation System (if installed): Confirm all sprinkler heads work and check for leaks in visible piping.

Around the House

Beyond individual rooms, there are a few house-wide plumbing components every new homeowner should know about.

On your plumbing checklist, include:

• Water Heater: Look for rust, sediment, or leaks at the base. Flush it to prevent buildup if possible.
• Main Shut-Off Valve: Know where it is. Check for signs of leaks and test whether it shuts off properly.
• Sump Pump: If your home has one, fill the pit with water to see if the pump activates.
• Branch Shut-Off Valves: Test these too—especially for zones like the kitchen or laundry room.
• Water Pressure: Use a gauge to test. Ideal pressure is between 40–60 psi. High pressure can damage your system.

Septic & Sewer Systems

These systems aren’t always covered in standard inspections but are crucial to your home’s function and safety.

Here’s what to do:

• Sewer Lines: Test for slow drainage by emptying multiple fixtures at once.
• Septic Tank: If applicable, make sure it’s been pumped recently. Avoid sending food or chemicals down the drain.
• Vent Pipes: These should be free of debris and snow. They help balance air pressure in your system and keep things flowing.

Common Plumbing Issues to Watch Out For

Even if things look okay at first glance, some signs suggest deeper issues. Keep your eyes peeled for:

• Persistent dripping faucets
• Weak water pressure in multiple areas
• Water stains on ceilings or under cabinets
• Slow draining in tubs or sinks
• Running toilets
• Strange smells near drains or fixtures

Don’t ignore them. These small signals can snowball into expensive repairs if left unchecked.

FAQs About Plumbing Inspections

How often should a plumbing inspection be done?
About once every two years is enough—unless you notice a specific issue.

What’s the best way to clear a clogged drain?
Skip the chemical cleaners. Use a mix of baking soda and vinegar, followed by boiling water (or a plunger!)

Why do pipes need inspection even if they’re not leaking?
Because corrosion, sediment buildup, and loose fittings can lead to big problems later.

How do I fix a constantly running toilet?
Start by replacing the flapper valve. If that doesn’t fix it, check the fill valve or float height.

Final Thoughts: Keep Your Plumbing in Check

No matter how charming a home looks, a faulty plumbing system can turn your dream into a disaster. That’s why a thorough plumbing checklist is non-negotiable for new homebuyers.

Before you sign anything, go room-by-room and check:

• Faucets
• Drains
• Toilets
• Shutoff valves
• Water pressure
• Sewer connections
• And all the sneaky spots in between

It’s worth the time now to save thousands later.

So print out this plumbing checklist, grab a flashlight, and get inspecting—or better yet, have a certified pro do it for peace of mind.

Call 1-Tom-Plumber 

Don’t hesitate to contact us here or call us at 1-Tom-Plumber (1-866-758-6237) if you need any plumbing, drain cleaning, water damage, or excavation service. 1-Tom-Plumber’s certified team of plumbers and drain technicians respond immediately to any emergency plumbing, drain cleaning, or water damage problem. We also handle the excavation of underground water lines and sewer main lines. Our immediate-response team is available every day and night of the year, even on holidays.