If you are buying a home, the plumbing is checked in two layers. Your general home inspection looks at the visible plumbing. A sewer camera or a plumber’s review goes deeper, and it makes sense when the first layer shows something odd or the house is older. The same logic applies to electrical: the general inspection covers the visible basics, and a specialist follows up on specific red flags.

This guide explains what each layer includes, what it costs, which warning signs matter, and how to use the findings before closing. We are Hunt Home Inspection, LLC, and we work with buyers in the St. Louis Metro area and Southern Illinois.

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TL;DR

A general buyer’s inspection already looks at supply lines, drains, water heaters, fixtures, panels and outlets, but only what is visible and safely accessible.
Add a sewer camera inspection when the home is older, has mature trees near the lateral, or the general inspection shows slow drains or odd piping.
Typical published figures: about $300 to $500 for a general inspection, and $180 to $225 for a plumbing or sewer scope.
Plumbing and electrical findings are negotiation points, not automatic deal-breakers. Sort them into safety, urgent and cosmetic.
Go to the inspection if you can. Seeing the shutoff, the panel and the cleanout in person is worth the hour.

What a plumbing inspection covers when you buy
Plumbing warning signs to look for before closing
When to add a sewer camera inspection
What a pre-purchase electrical inspection covers
What each check costs
Should you attend the inspection?
Use the findings before closing
Our perspective
Book the inspection that fits the house
Other add-ons buyers often pair with plumbing checks
Questions to ask before you book
FAQ
Sources

What a plumbing inspection covers when you buy

Most buyers never book a stand-alone plumbing inspection. The plumbing is part of the general inspection, and that is a real inspection, not a glance. Florida’s Office of the Insurance Consumer Advocate says a standard home inspection typically includes visible water supply and distribution lines, drain, waste and vent pipes, water heaters and plumbing fixtures.

InterNACHI’s plumbing standard is more specific. It lists:

The main water shutoff
Water-heating equipment
Interior water supply and fixtures
Toilets, sinks, tubs and showers
Drain, waste and vent systems
Accessible sump pumps

The same standard says the inspector reports observed leaks, defective fixture installation, and deficient flow when two fixtures run at the same time. It also covers damaged, loose, leaking or nonoperating toilets.

In practice, that means the inspector runs water, flushes toilets, opens the cabinet under every sink, looks at the water heater, and checks visible pipe material and condition. They also look at ceilings and walls below bathrooms for stains. You can read more about this routine in our guide to what inspectors look for in a home.

What the general inspection does not do

Scope matters. ASHI’s standards limit inspections to components that are readily accessible and visually observable. They are not technically exhaustive and are not code-compliance certifications. InterNACHI likewise describes a general inspection as a visual examination of major systems that are visible and safely accessible, with scope and exclusions agreed in advance.

That is why a pipe buried in a slab or a drain line running under the yard is outside a standard walkthrough. Those are exactly the places a camera can reach.

Florida’s consumer guide also advises settling the scope before the work begins and asking for the standards of practice the inspector follows. A written report with photographs and recommendations is the normal deliverable. Our reports come back within 24 hours, so you have time to act inside your contingency window.

Plumbing warning signs to look for before closing

You do not need to be a plumber to spot trouble at a showing or during the inspection. Real estate guidance points to a short list: leaks, water-pressure problems, outdated lead or polybutylene pipes, and signs of water damage.

Here is how that looks on a walkthrough:

What you see	What it can point to	What to do
Stains, warped cabinet floors, peeling paint under sinks	Slow or past leaks	Ask the inspector to document and moisture-check the area
Musty smell in a basement or crawl space	Moisture that may be ongoing	Raise it with the inspector; consider mold testing if the report supports it
Weak flow when two fixtures run at once	Supply line or valve restriction	Make sure the inspector runs fixtures together
Slow drains in several fixtures	A partial blockage or a problem in the main line	Consider a sewer camera
Old galvanized, polybutylene or lead-type supply lines	Age-related replacement cost	Get the pipe material named in the report
Water heater with rust, corrosion or a dated label	Near-term replacement	Budget it or request a credit

A few of these deserve extra attention.

Water heaters. They are one of the most common budget items in an older home. Ask the inspector to record the age and condition, and the location of the shutoff and relief piping.

Shutoffs. Know where the main water shutoff is before you close. InterNACHI’s standard includes it in the plumbing review, and it is the first thing you want to find on move-in day.

Sump pumps and sewage ejectors. If the basement has either one, the inspector should test it where accessible. A failed pump in a wet spring is an expensive lesson.

When to add a sewer camera inspection

The sewer lateral is the line that carries waste from the house to the main in the street. It is out of sight, it can be decades old, and the repair can cost far more than any fixture or water heater. Realtor.com’s guide to inspection types says to consider a specialized plumbing and sewer inspection with a scope if anything looks dicey or unconventional during the general inspection.

We would add one to the list when:

The house is older and may have clay, cast iron or other aging drain material.
There are large mature trees near where the lateral runs.
The general inspection shows slow drains, gurgling or sewage odors.
The seller cannot say when the line was last serviced or replaced.
The home has sat vacant for a while.

A camera is run through the cleanout or another access point and records the inside of the pipe, so you see cracks, offsets, root intrusion and standing water instead of guessing. The price depends largely on access, and we break that down in sewer camera inspection costs for US buyers. If you are unsure where the cleanout is, our page on sewer cleanout location helps, and the sewer scope guide for homebuyers walks through the process. For older homes with cast iron, our note on cast iron drain pipes explains why we like the camera first.

We offer sewer camera lateral inspections, and septic and well inspections for properties off municipal service. Many homes in Southern Illinois and the outer Missouri suburbs fall in that second group, so ask about it early if the listing mentions a septic tank or private well.

What a pre-purchase electrical inspection covers

Buyers who search for plumbing checks often search for electrical ones in the same breath, and the structure is similar. Florida’s consumer guide notes the standard inspection also typically includes service panels, breakers, outlets, switches, grounding and bonding, and smoke and carbon monoxide alarms.

InterNACHI’s electrical standard names the same ground: the service drop and entrance, meter and base, main disconnect, panels, overcurrent protection, grounding and bonding, a representative number of switches, fixtures and receptacles, GFCI devices, and the presence of smoke and CO detectors.

The word “representative” matters. The inspector samples devices and does not test every outlet in the house. The same standard says a general electrical inspection does not require:

Inserting tools into panels or removing dead fronts
Resetting breakers
Testing smoke or CO alarms
Measuring unlabeled service amperage or voltage
Voltage-drop calculations
Verifying the service ground
Inspecting low-voltage, solar, generator or battery systems

If your target home has solar panels, a generator or a battery system, ask during scheduling how they will be handled in the report.

Electrical signs that call for a closer look

Realtor.com says an additional electrical inspection may be appropriate for faulty or exposed wiring, nonworking outlets or switches, older or knob-and-tube wiring, or a panel that is not a breaker box. Other guidance lists outdated panels, insufficient capacity and problems with outlets or wiring among the common concerns.

When the report flags any of these, the right next step is a licensed electrician who can open the panel and trace the problem. Do not attempt to open a panel or test wiring yourself. Let the inspector point it out, then let a licensed professional evaluate it.

What each check costs

We do not publish flat prices for our services, because they depend on the property. Here are the market figures buyers see.

Service	Typical published range	Source
General home inspection (ASHI or InterNACHI inspectors)	About $300 to $500	National Association of Realtors
Plumbing or sewer scope inspection	$180 to $225	Realtor.com, 2022
Dedicated electrical inspection	$150 to $500	Realtor.com, 2022

Square footage, foundation type, the age of the house and how hard the cleanout is to reach all move the price. Ask for a quote that names exactly what is included, and compare scope as well as the dollar figure. If budget is tight, our page on budget home inspection options explains how to prioritize. We also offer discounts for veterans and first-time buyers.

Should you attend the inspection?

Yes, when you can. The National Association of Realtors says buyers may want to accompany the inspector, who can show them plumbing or electrical details and help them understand the scope of potential problems.

A photo of a main shutoff is useful. Standing next to it, with the inspector explaining which way the handle turns, is better. The same goes for the electrical panel and the sewer cleanout. See our guide on whether to attend your home inspection, and what to expect on inspection day if it is your first time. If you live out of town, we offer video walkthroughs, and our out-of-state inspection guide covers how that works.

Use the findings before closing

A report with plumbing and electrical findings is not a verdict on the house. The National Association of Realtors notes that some findings may need further investigation by a specialist and may become points for negotiation.

Redfin’s buyer guidance describes how documented findings help you separate urgent or safety-related defects from cosmetic items. They also help you request repairs or credits, renegotiate price, budget for repairs and decide whether to proceed.

A practical way to sort a report:

Safety first. Active leaks, exposed wiring, missing GFCI protection, no smoke or CO alarms, and sewage backups come first.
Big-ticket age items. Water heater, supply piping, panel and sewer lateral. Get a specialist quote if the report recommends one.
Maintenance. Dripping faucets, loose toilets and worn caulk. Often easiest to handle yourself after closing.
Cosmetic. Leave these out of the negotiation.

Then decide what to ask for: a seller repair by a licensed contractor, a credit at closing, or a price reduction. Credits are often simpler when you plan to choose your own contractor. Our guides to types of inspection summary reports and how to summarize an inspection report help you turn a long report into a short request list. We also built the Create Request List™, a tool that streamlines communication between you and your agent.

Our perspective

Most buyers ask whether the plumbing needs its own inspection. We think the better question is what the general inspection can and cannot see, and what the house in front of you suggests.

A buyer’s inspection from us covers the visible plumbing and electrical systems and tells you plainly what needs a closer look. When the house is older, the drains are slow, or the lateral is out of sight, a sewer camera turns a guess into a recording you can show your agent. For homes on a septic tank or well, we add those inspections so you know what you are really buying.

Our approach is built around the buyer who does not have much margin for surprises. First-time buyers, low-income families and veterans often cannot absorb a $10,000 repair in month two. That is why we return reports within 24 hours, schedule evenings and weekends, and offer video inspections. Our NACA, ASHI and HUD 203k credentials mean we are used to the pace and paperwork of financed purchases.

Hire an inspector who explains findings in plain words, ranks them, and helps you turn them into a request list. That is how a repair report becomes a better deal.

JOHN

Book the inspection that fits the house

If you are under contract in the St. Louis Metro area or Southern Illinois, we can schedule a buyer’s inspection and add a sewer camera lateral inspection, radon testing, mold inspection, or a septic and well inspection in the same visit window when the property calls for it. Reports return within 24 hours, with evening and weekend appointments and video options available.

See every service on our inspection services page, or start at Hunt Home Inspection to request your appointment. If you are comparing companies first, our selection criteria for homebuyers lays out what to ask.

Other add-ons buyers often pair with plumbing checks

Water problems rarely stay in the pipes. A slow leak can feed mold in a crawl space or attic, so if the plumbing review shows moisture, read our notes on crawl space mold before closing and what a mold inspection is.

Radon enters through the foundation rather than the plumbing, but basement buyers should consider it at the same time. Our environmental testing guide explains why radon and lead come first, and radon test duration shows how long each test type takes so it fits inside your contingency period.

Questions to ask before you book

Before the appointment, put these in writing:

Which plumbing and electrical items are in the scope, and which are excluded?
Will fixtures run at the same time to check flow?
Is a sewer camera available, and can it be done on the same day?
How soon will I receive the report, and will it include photos?
Can I attend, or join by video?

Our longer list is in questions to ask a home inspector. If you want to prepare the house walkthrough itself, use our pre-inspection checklist for buyers.

FAQ

Do I need a separate plumbing inspection when buying a home?

Not always. A general inspection covers the visible plumbing, including supply lines, drains, fixtures and the water heater. Add a sewer camera or a plumber’s review when the house is older, drains run slow, or the report flags something it could not fully evaluate.

How much does a plumbing inspection cost?

Realtor.com reports $180 to $225 for a plumbing or sewer scope inspection, and the National Association of Realtors cites about $300 to $500 for a general inspection. Your price depends on the home and the access to the sewer line. Ask for a quote that spells out the scope.

What is the biggest plumbing red flag in a home inspection?

Active leaks and signs of past water damage matter most, because they can hide larger problems behind walls and under floors. Sewer line defects and aging supply pipes are the costly ones. Ask the inspector which findings need a specialist’s opinion before you close.

Is it normal for a buyer to attend the inspection?

Yes. The National Association of Realtors says buyers may accompany the inspector, who can show them plumbing and electrical details and explain what the findings mean. If you cannot be there, ask for a video walkthrough or a photo-rich report.

When do I need an electrical inspection as a buyer?

The general inspection already samples the panel, outlets, switches and GFCI protection. If it finds exposed or faulty wiring, dead outlets, knob-and-tube wiring or an unusual panel, have a licensed electrician evaluate it before closing.

Plumbing Inspection for Buyers: What It Covers and When to Add One