When selling or buying a home, passing a home inspection is a crucial milestone, and the plumbing system plays a big role in the final report. Overlooked leaks, outdated fixtures, or low water pressure can raise red flags for both inspectors and buyers. That’s why a thorough home inspection plumbing checklist is essential to ensure everything flows smoothly - literally and figuratively. In this blog, we’ll guide you through the key plumbing areas to check and fix before inspection day, helping you avoid costly surprises and ensure a successful inspection outcome.
Check for Visible Leaks in All Fixtures
Inspect every faucet, showerhead, and visible pipework throughout the property. Leaky fixtures are red flags to home inspectors, as they often indicate deeper plumbing problems. Tighten connections, replace worn washers, and ensure no water is dripping from sinks, tubs, or toilets. Check: any visible corrosion or moisture around joints or valves needs immediate attention.
Inspect Water Pressure and Flow Rates
Low water pressure is a sign of pipe obstructions, leaks, or outdated systems. Inspectors test faucets and showers to evaluate whether water flow is consistent and strong. Use a pressure gauge to ensure that pressure levels fall between 40-80 psi. Anything above or below this range can raise concerns.
To ensure consistent flow:
- Flush all toilets and run all taps simultaneously.
- Ensure showers maintain good pressure under simultaneous water use.
- Clean aerators to remove debris or calcium buildup.
Examine the Water Heater
The water heater is a major inspection point. Inspectors look for proper installation, age, and operational integrity. Ensure the Temperature and Pressure Relief (TPR) valve is functioning and not leaking. Also, check the following:
- A heater is securely mounted and upright
- No rust or corrosion on tank exterior
- Proper ventilation for gas units
- Functional drain valve
- No signs of sediment buildup
Ideally, the water heater should be less than 10 years old and free from any warning signs. Regular inspections help you stay ahead of issues and avoid the common causes of a leaking water heater during home evaluations.
Ensure Drains and Traps Are Functioning Properly
Slow drains or standing water are clear indicators of potential blockages. Inspectors run water in sinks and tubs to confirm swift drainage. Ensure all P-traps are installed correctly and intact under each fixture.
Checklist for the drain function:
- Clean out hair, grease, or other obstructions from drains
- Check for gurgling noises or foul smells
- Use drain cleaners or snakes if necessary
- Ensure cleanouts are accessible and sealed
Test All Toilets for Proper Operation
Toilets must flush fully and refill correctly. Common issues like running toilets, partial flushes, or leaks at the base can easily derail an inspection.
Toilet inspection checklist
As you go through this process, it’s also a good opportunity to be mindful of potential signs your toilet needs to be replaced, especially if maintenance is becoming increasingly frequent or performance is inconsistent.
Inspect Pipes for Signs of Corrosion or Damage
Old galvanized or lead pipes may fail a home inspection outright. Inspect all visible pipes for signs of:
- Corrosion or rust
- Leaking joints
- Discoloration or green staining (common with copper)
- Bulging or cracking
Replace outdated or damaged piping with PEX or copper for best results.
Verify Proper Venting of the Plumbing System
A properly vented system ensures that sewer gases are expelled safely. Inspectors will check vent stacks on the roof and ensure that all fixtures are adequately vented to prevent suction, which causes poor drainage or dry traps.
Key venting checklist:
- All fixtures have vents
- No gurgling sounds when draining
- Vent stacks are unobstructed (check from the roof)
- No foul odors from drains
Check the Main Water Shut-Off Valve
Every home must have an accessible and fully functional main water shut-off valve. Inspectors will often locate and test this valve. Ensure that:
- The valve is easy to find and labeled clearly
- It operates smoothly and shuts off water entirely
- No signs of leaking or corrosion are visible
This is essential for emergency plumbing control and is often cited in inspection reports if not properly maintained.
Look for Evidence of Water Damage
Water stains, mold, or warped flooring near plumbing fixtures raise red flags. Inspect areas around:
- Sinks and tubs
- Dishwashers and laundry machines
- Toilets and baseboards
Address any signs of past or current leaks, and document repairs with receipts to show inspectors.
Inspect the Sewer Line (If Applicable)
In older homes or properties with frequent plumbing issues, a sewer camera inspection may be recommended. This reveals potential root intrusion, pipe collapse, or buildup within the main drain line.
If you suspect sewer issues:
- Hire a licensed plumber for a camera inspection
- Schedule jetting or repair before inspection
- Provide documentation to inspectors showing repairs done
Ensure Appliance Connections Are Up to Code
Inspectors often check washing machines, dishwashers, and refrigerators with water lines. Ensure all connections are:
- Leak-free
- Using proper hoses (no rubber)
- Secure and professionally installed
Replace outdated or damaged hoses with stainless steel braided lines for durability and safety.
Double-Check Exterior Plumbing
Outdoor spigots and irrigation systems must be in good condition. Inspectors evaluate:
- No dripping or spraying from hose bibs
- Functional backflow preventers on irrigation lines
- No exposed piping is vulnerable to freeze damage
- Securely anchored outdoor fixtures
Seasonal checks are essential to prevent freezing or cracking, which could lead to costly repairs and negatively impact inspections. Homeowners looking to maintain compliance and prevent issues should consider professional plumbing services to ensure all exterior plumbing components are properly maintained and up to code.
Document All Repairs and Upgrades
One of the best ways to ensure a smooth home inspection is to provide a record of plumbing maintenance. Keep:
- Receipts of licensed plumber visits
- Photos of replaced fixtures or pipes
- Inspection reports from past repairs
- Permits for major plumbing work
This level of transparency reassures inspectors and prospective buyers.
Conclusion: Your Home’s Plumbing is Inspection-Ready
Preparing your home’s plumbing system for a successful inspection doesn’t just improve your chances of a smooth sale - it also shows buyers that your property is well cared for. By following this plumbing checklist, you can address common red flags such as leaks, low water pressure, and outdated components before they become deal-breakers. Staying proactive helps prevent costly delays and gives you peace of mind during the inspection process.
If you’re searching for plumbing repair near me, don’t leave it to chance - contact the trusted professionals at Home Alliance. Our licensed plumbers can perform a full inspection, tackle repairs, and ensure everything is up to code before inspection day. A little preparation now can make all the difference later.
FAQs
- What plumbing issues commonly cause a home to fail inspection?
Common issues include visible leaks, low water pressure, corroded or outdated pipes, and slow drains. Inspectors also flag poor water heater condition and improper venting.
- How can I improve my home’s water pressure before inspection?
Start by cleaning faucet aerators and showerheads to remove debris. If pressure remains low, check for hidden leaks or consult a plumber to inspect the main supply line.
- Is a sewer camera inspection necessary before selling a home?
It’s not required but highly recommended, especially in older homes or those with a history of plumbing problems. It helps uncover root intrusion or pipe collapse before they appear on the inspection report.
- How old can a water heater be before it’s a concern in an inspection?
Water heaters older than 10 years may raise concerns even if still functioning. Replacing it proactively can boost buyer confidence and inspection outcomes.
- Do I need to upgrade all plumbing fixtures to pass inspection?
Not necessarily - only fixtures that are leaking, damaged, or outdated should be repaired or replaced. Ensuring all plumbing elements function correctly is more important than aesthetics.
