Should I scope my sewer before listing my Seattle house?

What buyers do

A sewer scope has become a standard part of a Seattle inspection on any house older than a few decades. The buyer's inspector or a sewer contractor runs a camera during the inspection contingency, and whatever it shows lands on the negotiating table with someone else's number attached. In a competitive market some buyers waive it; in a normal one they do not, and a bad scope is one of the most common reasons a deal is re-traded or dropped.

Why the seller wants to look first

You choose the contractor and the method. A buyer's contractor has no reason to propose the least disruptive option.
You choose the timing. A lining job scheduled two weeks before listing is a footnote; the same job squeezed into a ten-day contingency is a crisis.
You control the number. A repair credit is negotiated from the buyer's estimate, which is rarely the low one.
A fixed line is a feature. "Sewer lined in 2026, paperwork available" is a line in the listing that older-house buyers notice.
A clean line is a feature too. A dated video showing sound pipe is inexpensive insurance against a buyer's inspector calling routine roots a "failing sewer."

Which houses this applies to most

Anything built before 1980, anything that has ever backed up, and anything with mature trees over the route. In practice that is most of Ballard, Wallingford, Green Lake, Ravenna, Capitol Hill, Queen Anne, Magnolia, Beacon Hill and West Seattle, and the postwar parts of Lake City, Shoreline and Edmonds. The house-age guide says what is likely under each.

What to do with the findings

Scope shows	Sensible seller path
Sound pipe, no defects	Keep the video; mention it in the listing
Light roots, minor offsets	Clean and disclose, or line now and list it as done
Moderate defects, lineable	Line before listing; the cost is predictable and the result is a selling point
Collapse, Orangeburg, severe offsets	Replace before listing if time allows; otherwise get two written bids and disclose with them attached
Shared line with a neighbor	Document it now; buyers' lenders sometimes ask

Disclosure

Washington's seller disclosure form asks directly about the sewer and about backups. Once you have scoped, you know, and you disclose what you know. The good news is that a disclosure that reads "roots found at two joints; line cleaned and lined on [date]; paperwork attached" is not a red flag. It is the opposite. The warranty article explains what "transferable" should actually mean before you rely on it.

Timing

Scope six to eight weeks before listing. That leaves time for a permit and a lining or bursting job if one is needed, and for the final video to be in the listing packet. A pre-listing inspection is a small line in the cost of a sale, and on an old Seattle house it means you list knowing what is in the line.

Questions people also ask

Do I have to disclose a sewer problem in Washington?

The seller disclosure statement asks about known defects in the sewer system and any known sewer backups. Once you know, you disclose; a repair record turns the disclosure from a warning into a selling point.

Will a buyer accept my scope video?

Most will still do their own. Yours matters because it removes the surprise: if their scope matches, there is nothing to negotiate; if it shows something new, you have a baseline to compare.

Is it better to fix the line or offer a credit?

A completed repair with written paperwork for the job is usually worth more to a buyer than a credit of the same size, because it removes uncertainty. Credits get negotiated up; finished work does not.

What if the scope shows the line is fine?

Then you have a dated video that says so, which is worth putting in the listing packet. Buyers of older Seattle houses read “sewer scoped, no defects” as a real feature.

More of the questions we hear every week are on the FAQ page .