Nobody can price a pipe they haven't looked inside

Your basement floor drain backs up for the third time this year. One plumber quotes three thousand for a spot repair. Another quotes fourteen and a half to replace the whole lateral from the house to the street. Both were standing in the same basement.

Here is the uncomfortable part: from the information in those two quotes, you cannot tell which one is right. Neither can they, unless somebody put a camera down the pipe.

Line one

Was there a scope, and do you get the footage

A sewer camera goes in at the cleanout and travels the length of the line, and most services locate the camera head from above ground as it goes, so a defect gets a distance and a depth rather than a vague description.

That matters because the repair depends entirely on what is wrong and where. Roots at one joint forty feet out is a different job from a crushed section under the driveway, and there is no way to tell them apart from inside your basement.

So the first question is simply whether a scope happened. The second is whether you get a copy of the footage and the locate. You paid for the inspection, or it was included in a bid you're being asked to accept, and the recording is the only evidence anyone has about your pipe. Get it. It also lets a second contractor quote against the same facts instead of starting over.

Line two

What the camera actually found

A handful of findings account for most residential sewer problems, and each points somewhere different.

Roots entering at a joint. Common, and often repairable at that joint or solvable by lining a section, since the pipe wall is usually intact.

An offset or separated joint, where two sections no longer line up. If it's minor, lining can bridge it. If the sections are separated by inches of soil, that section is coming out.

A belly — a sag where the soil beneath settled and the pipe dropped, so water sits in it instead of flowing. This is the one in the drawing and the one most often misunderstood in both directions.

Channelling or collapse, where the bottom of the pipe has worn through or the pipe has failed structurally. Lining needs a reasonably intact host pipe to cure against, so a badly collapsed line rules it out.

Old pipe material matters too. Clay tile and cast iron both have decades of service behind them and specific failure modes. If your line is Orangeburg — a bituminous fibre pipe used in some mid-century construction — it deforms rather than cracks, and its remaining life is a live question regardless of what today's blockage is.

Line three

Whether the proposed repair matches the finding

Three methods, and they are not interchangeable.

Spot repair digs to one defect and replaces a short section. Cheapest by far, and correct when the camera shows a single localised problem in otherwise sound pipe.

Lining, usually cured-in-place pipe, pulls a resin-saturated liner through the existing pipe and cures it into a new pipe inside the old one. No trench, which is why it's attractive when the line runs under a driveway or mature trees. It's excellent for roots, cracks and corrosion in a pipe that still holds its grade.

And here is the thing worth carrying away: a liner takes the shape of the pipe it cures inside. Line a bellied pipe and you get a smoother belly. The water still pools, the waste still settles, and the line clogs again — now with a liner in the way. The only durable fix for a real sag is digging to it, re-establishing the bedding, and setting pipe back at proper slope.

Full replacement, by open trench or by pipe bursting, puts in a whole new line. Sometimes genuinely necessary. Sometimes the answer to a problem a spot repair would have fixed.

Which brings up the over-sell, because it cuts both ways. A belly is one of the most common findings on any sewer camera inspection, and plenty of them are shallow, stable and symptomless — the right response to those is to note it and check again in a few years, not to replace the line. If a quote jumps from "we saw a belly" to "you need a full replacement," the missing step is how deep the sag is, how long a run it covers, and whether it's the thing actually causing your backups.

Line four

Where your pipe stops being yours

The lateral runs from your house to the city main, and in most places you own it — often the whole way, sometimes only to the property line.

This is worth establishing before anyone digs, because the split determines who pays for what, and it varies by municipality rather than by any general rule. A contractor working in your city should know it. Your public works department will confirm it. Some cities also run assistance programmes for lateral repair, which nobody volunteers.

Two more things live in the same part of the quote. Restoration: who puts the yard back, and does the price include replacing driveway concrete, sidewalk or landscaping that came out. That can be a large number on its own and it's frequently excluded in a footnote. And permits and locates: sewer work is permitted work in most jurisdictions, and utility locates have to be called before anyone digs. A quote that mentions neither is quoting a smaller job than the one that will actually happen.

Worked example

The same backup, priced two ways

The dollar figures below are illustrative. They exist to show the shape of the gap, not to price your job.

Quote A might be right. If the only problem is roots at one joint, three thousand dollars fixes it and the rest is unnecessary.

But Quote A doesn't know whether that's the only problem, because nobody looked. If it spot-repairs the wrong forty feet, you have paid three thousand dollars and still have a backup — and you now also have a fresh hole in the yard.

That's the asymmetry worth holding onto. A camera inspection is the cheapest line item in this entire conversation, and it is the only one that tells you whether the expensive quote is honest or excessive.

Before you sign

Six questions that make quotes comparable

If a contractor won't camera the line before quoting a five-figure repair, that tells you something on its own. The scope is a couple of hundred dollars against a decision worth many thousands, and any plumber confident in their diagnosis should be happy to show you the evidence for it.

Get those six answers in writing from everyone bidding and you stop comparing three numbers. You start comparing three jobs.

Ownership of the lateral, permitting, restoration standards and any municipal assistance programmes vary by jurisdiction — confirm yours with your local public works department. Written for homeowners and offered as general guidance only. It is not a substitute for a written, itemized proposal from a licensed plumber or for an on-site inspection. Sewage backing up into living space is a health hazard; treat it as urgent.