A sewer scope is a camera inspection of the drain and lateral of a house you are about to buy. It is separate from the general home inspection, it is rarely included unless requested, and it covers the one component of the house that can cost more than a roof to replace and that no one can see. This guide covers what it is, how to order it, what it finds and what to do with the result.
Quick answer: order a sewer scope on any house more than about twenty years old, any house with mature trees near the lateral, any house with a history of backups, and any house where the price makes a repair meaningful. Schedule it early in the contingency period, ask for the full video with distances and a written report, and use the findings to negotiate a repair, a credit or a walk-away. The cost is a few hundred dollars against repairs that start in the thousands.
What a sewer scope is
An inspector pushes a camera on a semi-rigid rod from a cleanout, or a pulled toilet or roof vent, through the building drain and the lateral to the public main, recording video and noting the distance to every observation. A sonde in the camera head lets them mark on the surface where a defect lies and how deep. The result is footage, stills and a written report. See what a pre-purchase inspection covers.
When to order one
Always on houses built before about 1980, where the lateral is likely clay, cast iron or Orangeburg. Always where trees stand over the line. Always where the disclosure or the neighbours mention backups. Usually on any house where a lateral replacement would matter to your budget, which is most houses. The exceptions are a recently built house with PVC and no trees, or a house with a recent scope and a lining certificate you can verify. Twelve situations that call for one goes further.
What it costs
Typically a few hundred dollars, more with a locate and a written report, more again in expensive markets. What drives the cost covers the factors. Against the price of a house and the cost of a lateral, it is the cheapest decision in the purchase.
Who does it
A specialist sewer inspection company, a plumber with a camera, or a home inspector who offers it as an add-on. Prefer someone who does not sell repairs, or at least get the repair opinion from someone who does not. Scams and upsells explains why.
Scheduling
Book it the day the contract is signed. Contingency periods are short, inspectors are busy in a hot market, and if something is found you need time for a second opinion and a quote before the deadline. Dry weather and a morning slot give the clearest picture. See scheduling and contingencies.
What the inspector looks for
Material first: clay with its root-prone joints, cast iron with scale and channeling, Orangeburg deforming, PVC or ABS with glued joints. Then defects by distance: roots, offsets, cracks, bellies, grease, scale, infiltration, a bad tap at the main. Then the main itself if the camera reaches it. The terminology and the common findings will make the report readable.
Reading the report
Check the entry point and that the camera reached the main. Match each finding to a still and a distance. Watch the video at the distances the report names. Separate maintenance findings, light roots and some scale, from repair findings, offsets, breaks, bellies and heavy roots. Reading the video as a first-time buyer walks through it.
Using the findings
Maintenance findings are a note for your first year. Repair findings are a negotiation: a repair by the seller before closing with verification footage, a credit against the price, or a walk-away if the cost is beyond what the deal can carry. Get a second scope or a contractor’s quote from the footage before naming a number. Negotiating sewer repairs covers the process and getting quotes from one video the mechanics.
Special cases
A lined lateral needs the liner inspected and the certificate checked. A known repair needs its footage. A private shared lateral needs the agreement read. A condo needs the ownership boundary established. Each has its own guide on this site.
After closing
Keep the footage and report. They are the baseline for every future inspection, the evidence for any claim, and the document the next buyer’s inspector will compare against. See how often to inspect.
What a sewer scope does not cover
The scope inspects the drain and lateral from the entry point to the main. It does not inspect the plumbing inside the walls, the vents, the water supply, a septic tank or drainfield, or the public main beyond the tap. A house on septic needs a septic inspection as well, and a house with a history of sewer smells may need a smoke test of the vents. The scope also cannot see what is outside the pipe or predict how long a defect will last; {L(‘what-a-sewer-inspector-cannot-tell-you-from-the-footage’,’what the inspector cannot tell you’)} covers the limits honestly.
Red flags in the process
An inspector who will not release the video, a report with no distances, a camera that stopped short with no explanation, a same-day lining quote, or a seller who refuses cleanout access. Each is a reason to slow down and get a second opinion before the contingency runs out.
Common questions
Is a sewer scope worth it on a newer house?
On a house under about fifteen years old with PVC and no trees, it is a lower priority, but builder mistakes happen and the cost is small.
Does the seller have to let me do a sewer scope?
It is part of the inspection contingency in most contracts. A seller who refuses access has told you something.
What if the camera cannot reach the main?
The report should say where it stopped and why. The uninspected section is unknown and should be treated as a risk in the negotiation.
Related guides
See sewer cameras for residential inspection, when to hire instead of buy, and seller disclosure and sewer problems.