What a home inspection does not tell you about the plumbing

The two facts that decide everything else

What the supply is made of, and what the drains are made of.

Supply material sets the risk profile. Polybutylene installed between January 1978 and July 1995 (Cox v. Shell Legal Notice, 2005) fails at fittings regardless of maintenance, and the whole system is on one timeline. Copper, CPVC and PEX each behave differently.

Drain material sets the liability. Collier County has a very large proportion of homes built before 1972 with cast iron underground (Revolution Florida, 2026), and cast iron corrodes from the inside so it degrades substantially while still passing water.

Neither is established by running a tap. Both are established by looking in the right places and, for the buried run, by putting a camera down it.

When an inspection pays for itself

Four situations where the answer is clear.

Before buying an older property. A drain line in poor condition is a five-figure liability that no visual inspection of the house reveals, and cast iron replacement runs about 10,000 to 20,000 dollars standalone (Revolution Florida, 2026).

Before a remodel. The same drain work costs roughly 3,000 to 8,000 dollars when floors are already open (Revolution Florida, 2026), so knowing before the schedule is fixed rather than after is worth a great deal.

Before a season away, on a property that will stand empty. And after any repeated failure, because repetition means the cause has not been addressed.

What is actually checked

Beyond what is visible from a fixture.

Supply and drain material identified at every accessible point, and the extent established rather than assumed — properties are sometimes partially replumbed without records.

Water pressure measured rather than judged, water heater age from its data plate against expected life, functioning shutoffs at fixtures and at the main, and whether a backflow device is present and within its certification.

On an older property, camera inspection of the main drain line, which establishes material, internal condition, grade and the location of any defect. That is the part no general inspection includes.

What to do with the report

Most findings are schedule items, not emergencies.

A degraded but functioning drain line is a planning decision about timing rather than something that needs acting on this week. Knowing it exists converts an unpredictable capital event into a dated one.

On a purchase, the findings are negotiable facts rather than deal-breakers. A quantified liability is easier to price into an offer than an unquantified suspicion.

The findings that do warrant prompt action are usually the small ones: a seized main shutoff, a missing or expired backflow certification, a water heater past expected life with no drain pan.

How much does a plumbing inspection cost?

A visual check is $100 to $200. Adding the camera is what makes it worth doing, and it roughly triples the price.

A basic visual plumbing inspection runs $100 to $200 (iBuyer, 2026). That covers what can be seen and operated: fixtures, visible supply and waste, appliance connections, the water heater, and evidence of past or present leaking.

A sewer camera inspection runs $125 to $500 for most residential properties (iBuyer, 2026), and a sewer line inspection specifically sits around $250 to $500 (iBuyer, 2026). This is the part that sees what the visual inspection cannot.

Combined, a visual plus camera inspection costs $400 to $1,300 and gives the most complete picture of the system (iBuyer, 2026). That is the version worth buying on any property where the answer actually matters — a purchase, a remodel, or a house old enough for the material to be in question.

The comparison that justifies it is not against zero, it is against the repairs it informs. A sewer spot repair starts around $1,500 and a full replacement runs into five figures, so an inspection is a small fraction of the decision — and on a purchase it is the only version of that information you can still act on.

Does a standard home inspection cover the drains?

No, and this is the single most common and most expensive misunderstanding in a property purchase.

A sewer scope is a separate, add-on service requiring specialised camera equipment and a licensed plumber or certified inspector (Home Inspecto, 2026). It is not part of a standard home inspection, and many buyers assume that it is (Home Inspecto, 2026).

The consequence is specific. A standard inspection covers what is visible and accessible, which means the drain line beyond the first few feet is outside its scope entirely. A buyer can receive a clean inspection report on a house whose lateral has a separated joint at thirty feet, and nothing in that report was wrong.

The timing is what makes it expensive. Before closing, a sewer finding is a negotiation — a price adjustment, a seller repair, or a walk-away. After closing it is your bill, and the repair costs the same either way.

Real estate and plumbing professionals generally recommend a sewer scope for any home purchase regardless of the property's age (Home Inspecto, 2026). In Collier County that recommendation carries extra weight, because a very large proportion of housing predates 1972 and carries cast iron drains underground (Revolution Florida, 2026).

The practical instruction is short: ask your inspector explicitly whether a sewer scope is included, and assume the answer is no unless you commissioned it separately.

What does a thorough inspection actually cover?

Five areas. Any report that does not address all five has left something material unexamined.

The supply system: incoming pressure at a hose bib, the condition and operation of the main shutoff, visible pipe material and any evidence of previous repair. Incoming pressure is the item most often skipped and it is the one that stresses every joint in the house continuously if it is high.

The drainage system: how each fixture drains under load rather than under a trickle, evidence of slow flow, and — through the camera — the actual condition, material and fall of the buried line. Running fixtures simultaneously reveals restrictions that individual testing does not.

The water heater: age from the rating plate, evidence of sediment, corrosion at fittings, the presence and condition of the temperature and pressure relief valve and its discharge, and whether a drain pan and its drainage exist where required.

Cross-connection and backflow: what is connected to the potable supply, whether protection exists where it should, and whether any device present has been tested. On a property with irrigation this is routinely where the gap is.

Evidence of the past: staining, previous repairs, mismatched pipe materials and patched finishes. A house tells you what has already gone wrong with it if somebody looks, and repeated repair in one area is a stronger predictor than anything else on this list.

The output should be a condition report with photographs and, where a camera was used, the footage and the distances at which findings sit. A verdict without those is not something you can hand to a contractor or a seller.

When is an inspection worth commissioning?

Four moments, and three of them are windows that close.

Before a purchase is the highest-value moment and the one with a deadline. The finding is identical whenever it is made; what differs is whether you can still act on it. A separated joint found during due diligence is a negotiation. The same joint found in your second month of ownership is a repair you fund alone.

Before a remodel is second, and it is the one most often missed. Opening a slab, a wall or a ceiling for other reasons gives the cheapest access to the plumbing behind it that will ever exist on that property. Finding out afterwards that the drain under the new bathroom needed attention is an expensive sequencing error.

Before listing is third and it is genuinely underused. A seller who commissions the inspection controls the timing, the contractor and the remedy, and arrives at the negotiation with documentation rather than a surprise. A seller who does not will meet the same findings on the buyer's terms.

On any property old enough for the material to be in question is the fourth, and it has no deadline — which is why it gets deferred indefinitely. A very large proportion of Collier County housing predates 1972 and carries cast iron underground (Revolution Florida, 2026), and on those properties the inspection is establishing remaining service life rather than looking for a fault.

The case against is thin but real: a recently built property with no symptoms, recently inspected, does not need another one. Everything else on this list is a case where the information is worth more than it costs.

What do you do with the report afterwards?

Sort it into three piles. Most reports contain items from all three and present them as one list.

The first pile is anything actively losing water or actively causing damage. These are not scheduling decisions. A running leak, a failing water heater relief valve or a sewage backup gets addressed regardless of what else is on the list, because the cost grows while you decide.

The second pile is deterioration with a known trajectory. Cast iron showing wear at the invert, a water heater at eight years in hard water, scale narrowing a supply line — none of these needs attention this month, and all of them will need it. These belong on a dated plan rather than a to-do list, because their value is in being scheduled before they become the first pile.

The third pile is code and configuration items that are not failing and may never fail: a missing drain pan, an absent expansion tank, a shutoff that does not turn. They are cheap while somebody is already on site and expensive as their own visit, which makes them worth bundling with anything from the first two piles.

What separates a useful report from a sales document is whether it distinguishes these for you. A list that presents a seized shutoff and an active slab leak with the same urgency is not helping you decide, and a report that recommends replacement without stating the observed condition cannot be checked or second-opinioned.

Keep the report and the footage. On a property you are keeping it becomes the baseline that makes the next inspection meaningful — the value of a second camera run is entirely in comparison with the first. On a property you are selling it is documentation that the condition was known and addressed.

And get quotes against the report rather than against a walkthrough. A contractor pricing from a stated condition, distance and material is pricing the same job as everybody else you ask, which is the only circumstance in which comparing quotes tells you anything.

Who should carry out the inspection?

A licensed plumber for the plumbing, and not necessarily the same person selling you the remedy.

A sewer scope requires specialised camera equipment and a licensed plumber or certified inspector (Home Inspecto, 2026), which is precisely why it sits outside a general home inspection. A general inspector is qualified to assess what is visible and accessible; the buried drain line is neither.

On a contracting site in Florida the licence question is not a formality. Anyone advertising to perform plumbing work must hold and display a licence number, and confirming it before booking is a two-minute check that filters out a category of problem entirely.

The independence question is worth thinking about, though the honest answer is nuanced. A plumber who inspects and also repairs has an interest in finding work, and also has the equipment, the experience and the ability to act on what they find. The practical safeguard is not avoiding them; it is insisting on the evidence — the footage, the distances, the stated condition — so the finding can be checked by somebody else.

Where the stakes are high, a second opinion on a major recommendation is reasonable and normal. A replacement quoted into five figures deserves the same scrutiny as any other purchase at that level, and a contractor confident in their finding will not object to it.

What to avoid is an inspection with no documented output. A verbal verdict cannot be compared, cannot be negotiated against, and cannot be handed to anyone else — which means you have paid for information you cannot use.