What Happens During a Plumbing Inspection?
A step-by-step look at what a professional plumber checks, tests, and documents — and why it matters for your home in Sandy, Utah.
During a professional plumbing inspection, a licensed plumber evaluates water pressure, checks for leaks at all fixtures and connections, tests drain flow, inspects the water heater, examines pipe condition, and checks shutoff valves. The visit typically takes 1–2 hours and ends with a written report. Most homeowners find issues they didn’t know existed.
When we tell homeowners they should schedule an annual plumbing inspection, the most common response is: “What exactly are you going to do?” It’s a fair question. Unlike an HVAC tune-up or a furnace check, people have a much fuzzier picture of what a plumbing inspection actually involves.
At Top Shelf Plumbing Pros, we’ve done thousands of inspections across Sandy and the surrounding Salt Lake Valley. Here’s a complete, honest walkthrough of exactly what happens — from the moment we arrive to the written report you receive at the end.
Why Get a Plumbing Inspection in the First Place?
Before the how, here’s the why. A plumbing inspection isn’t just about finding broken things. It’s about understanding the full condition of a system that’s almost entirely hidden inside your walls, floors, and ceilings.
Most plumbing issues give warnings before they become failures. An inspection is specifically designed to catch those warnings — signs of a hidden water leak, early corrosion, mounting pressure, or a drain that’s slowly tightening toward a blockage. Catching these early is how plumbing maintenance saves homeowners money.
Step-by-Step: What a Plumbing Inspection Covers
Step 1 — Water Pressure Testing
The first thing we do is check your incoming water pressure. Normal residential pressure is 40–80 psi. Anything above 80 psi is damaging your fixtures, appliances, and pipe joints — even if everything seems fine right now.
We attach a gauge to a hose bib or laundry connection and take a reading. If pressure is high, we check whether a pressure-reducing valve (PRV) is installed and functioning. If it’s not, or if it’s failed, we note it as a priority repair.
You can buy a water pressure gauge at any hardware store for about $10 and test this yourself. Check it at different times of day — pressure fluctuates, and municipal systems often spike late at night when demand is low.
Step 2 — Leak Inspection at All Fixtures
We go through every plumbing fixture in the home systematically. That means every sink, toilet, shower, bathtub, and laundry connection. We’re checking for:
- Active drips or weeping from supply lines and drain connections
- Moisture staining under cabinets that indicates past or ongoing seepage
- Soft spots or discoloration on flooring near toilets or tubs
- Corrosion on valve bodies or compression fittings
- Loose or deteriorated caulk that’s allowing water intrusion at the wall
Most leaks we find are not dramatic. They’re a slow drip at a shutoff valve or a slightly weeping P-trap connection under the sink. But over months, those quiet leaks cause real damage and real cost.
Step 3 — Toilet Inspection
Toilets deserve their own step because they’re one of the most common sources of wasted water in a home. A toilet that “runs” can waste 200+ gallons per day — often silently enough that homeowners never notice.
We check:
- The flapper — does it seal correctly or allow tank water to trickle into the bowl?
- The fill valve — does it shut off cleanly or continue running after the tank refills?
- The bowl wax seal — are there any signs of seepage at the base?
- The supply line — is it flexible braided steel, or an older plastic line that’s a failure risk?
- Tank-to-bowl bolts — any corrosion or looseness that could cause a leak?
Step 4 — Drain Flow Testing
We run water through every drain in the home and observe how it flows. A drain that empties slowly is telling us something: there’s a restriction forming somewhere in the line.
This matters more than people realize. A partial drain blockage that causes mild slowness today becomes a full backup in weeks or months. Treating it now — before it’s an emergency — is faster, cheaper, and doesn’t involve a flooded bathroom. We cover this in more detail in our article on the most common plumbing problems caught early.
Step 5 — Water Heater Inspection
The water heater is one of the most maintenance-neglected appliances in a home. Here’s what we check on every inspection:
Anode Rod Condition
The anode rod sacrificially corrodes to protect the tank. When it’s depleted, the tank itself starts corroding. Most rods need replacement every 3–5 years.
Sediment Buildup
In Sandy’s hard water conditions, mineral sediment accumulates at the bottom of the tank. We check for rumbling sounds and assess when flushing is needed.
Pressure Relief Valve
The T&P valve is a safety device that prevents tank overpressure. We test it to confirm it opens and closes correctly — a failed valve is a serious hazard.
Connections and Fittings
We inspect cold water inlet and hot water outlet connections, as well as the gas line (for gas heaters) or electrical connections for any corrosion or wear.
Venting (Gas Units)
For gas water heaters, proper venting is critical. We confirm the flue is intact, unobstructed, and properly sloped to carry combustion gases out safely.
Tank Age and Condition
Water heaters have a rated lifespan. We check the serial number to determine manufacture date and assess overall condition relative to age.
Step 6 — Shutoff Valve Testing
Every shutoff valve in your home should turn freely and stop flow completely. Many homeowners have never tested theirs — and in older Sandy homes, we frequently find valves that are corroded open and won’t close.
This matters most in an emergency. If a supply line bursts and you can’t close the valve under the sink, water runs freely until the main is shut. We test every fixture valve and note any that are stiff, corroded, or incomplete in their shutoff.
Step 7 — Visible Pipe Condition Assessment
We inspect all accessible pipe runs — under sinks, in mechanical rooms, in crawl spaces or basements, and at appliance connections. We’re looking for:
- Green staining on copper (early corrosion / pinhole leak risk)
- Rust or flaking on galvanized steel pipe (common in older Sandy homes)
- Improper supports causing pipe stress at joints
- Signs of past amateur repairs that may not meet code
- CPVC or PVC that’s showing UV damage or improper glue joints
In homes with older plumbing, this is often where we find the most valuable information. See our guide on older home plumbing repair in Sandy for more on what to expect in aging systems.
Step 8 — Main Line and Exterior Assessment
We check the main water shutoff valve to confirm it’s accessible and functional. For homes with known tree coverage or a history of drainage issues, we may recommend a sewer camera inspection as a separate service to check for root intrusion in sewer pipes.
We also look at outdoor hose bibs, irrigation connections, and any above-ground supply lines exposed to temperature extremes.
What You Get at the End: The Written Report
A professional plumbing inspection doesn’t end when we walk out the door. You should receive a written summary that includes:
| Report Item | What It Tells You |
|---|---|
| Items inspected and condition | Full checklist of what was tested and the current status |
| Issues found (priority flagged) | Clear categorization: immediate action needed vs. watch list |
| Photos of problem areas | Visual documentation of anything unusual found |
| Recommended repairs | What needs attention, in what order, with approximate costs |
| Appliance age notes | Water heater manufacture date, estimated remaining life |
| Next inspection recommendation | When to schedule follow-up based on what was found |
This report is genuinely useful documentation. Many homeowners keep it with their home records, reference it when listing the home for sale, or use it to plan budgets for upcoming maintenance years.
If a plumber completes an “inspection” in under 30 minutes and doesn’t give you a written report, that’s not a real inspection. A thorough inspection of a typical single-family home takes 60–90 minutes minimum. Don’t pay inspection prices for a walk-through.
How a Plumbing Inspection Differs by Home Type
Not every inspection is the same. Here’s what changes based on your home’s age and type:
| Home Type | Additional Focus Areas |
|---|---|
| Newer construction (under 15 years) | Verify pressure, check appliance connections, confirm no early CPVC issues |
| Mid-age home (15–30 years) | Water heater age assessment, PRV condition, first signs of corrosion on copper |
| Older home (30+ years) | Galvanized pipe condition, full drain assessment, sewer camera often recommended |
| Home with well water | Pressure tank, softener condition, sediment filter, water quality markers |
| Rental property | Full fixture inspection, proof of compliance with Utah code requirements |
How Long Does a Plumbing Inspection Take?
For most single-family homes in Sandy, a thorough inspection takes between 60 and 90 minutes. Larger homes, older homes, or homes with complex systems may take up to 2 hours.
Plan to be home for the full duration. Walking through the property with the plumber and asking questions is how you get the most value from the visit. We always encourage homeowners to ask “why” when we flag something — a good plumber should always be able to explain the reason.
What Happens After the Inspection?
Once you have the report, you’re in the driver’s seat. Here’s how to think about next steps:
- Address immediate priorities first. Anything flagged as urgent — active leaks, failed valves, compromised T&P valve — should be scheduled right away. These carry real risk of damage or safety issues.
- Plan for watch-list items. Items that aren’t urgent but need attention within 6–12 months should go on your budget plan. These are things that are fine now but deteriorating.
- Get quotes for larger work. If the inspector recommends a significant repair, get at least two quotes. There’s no pressure to use the same company that did the inspection.
- Schedule your next inspection. Put a recurring reminder in your calendar. Annual is standard; twice yearly if your system is older or has known issues.
If you’re buying a home, schedule a separate plumbing-specific inspection in addition to the general home inspection. Home inspectors are generalists — they surface-check plumbing but won’t do the deep diagnostic that a licensed plumber performs. This is especially important for older Sandy homes with galvanized pipe or original fixtures.
Is a Plumbing Inspection Worth the Cost?
In our experience, nearly every plumbing inspection reveals at least one issue the homeowner didn’t know existed. Sometimes it’s minor — a shutoff valve that’s stiff, a slow drain that needs treatment. Other times it’s significant — a water heater near failure, a corroded fitting at risk of leaking behind a wall.
The cost of a thorough inspection ($150–$300) is almost always less than the least expensive repair it might prevent. And the psychological value of knowing your system is in good shape — or knowing exactly what needs attention — is real.
Learn more about structuring ongoing care for your system with a residential plumbing maintenance plan.
Frequently Asked Questions
Do I need to be home during a plumbing inspection?
Yes. A plumber needs access to every fixture, the water heater, and typically a utility space or basement. We also need to run water and test drains, which means we’ll be moving through the whole home. Being present also lets you ask questions in real time.
How much does a plumbing inspection cost in Sandy, Utah?
Most thorough plumbing inspections in the Sandy area run $150–$300 depending on home size and what’s included. Some companies offer discounted inspections as part of a maintenance plan membership.
Will the plumber try to sell me repairs during the inspection?
A reputable plumber will report what they find and give you options — not pressure you into on-the-spot decisions. Be cautious of any company that won’t let you review the report before pushing you to book immediate work.
Does a plumbing inspection include a sewer line camera inspection?
Not typically. A sewer camera inspection is usually a separate service. However, if your home is older, has mature trees nearby, or has had slow drains or backups, we often recommend adding one. Learn more about how tree roots damage sewer pipes.
How is a plumbing inspection different from a home inspection?
A home inspection gives a broad overview of all systems. A plumbing inspection is a specialist-level assessment that goes significantly deeper — testing pressure, checking every valve and fixture individually, and evaluating pipe condition. They serve different purposes and shouldn’t replace each other.
What should I do to prepare for a plumbing inspection?
Make sure all areas are accessible — under sinks, around the water heater, and in crawl spaces or utility rooms. Note any issues you’ve already noticed (slow drains, running toilets, water bill spikes) and mention them when the plumber arrives. That helps prioritize the inspection order.
Schedule a Professional Plumbing Inspection in Sandy
Our team provides comprehensive, documented plumbing inspections for Sandy-area homes. You’ll receive a written report with photos, a priority list, and honest recommendations — no pressure, no surprises.