Yes, for nearly every house you're serious about. A sewer scope sends a camera from a cleanout toward the street and shows what the pipe is made of and where it has roots, breaks or sags. It costs a few hundred dollars, while most of the sewer repairs we made this year ran about $3,000 to $20,000.
In Seattle and on the Eastside, most of the pipe between a house and the public sewer belongs to the homeowner, so whatever is wrong with it on closing day becomes the buyer's to fix. Seattle Public Utilities puts it plainly in its advice to homeowners: have the side sewer inspected before you purchase a property. Here is what a scope can tell you, from the camera work we did in 2026.
1. What the pipe is made of
Old concrete, clay and cast iron each age in their own way, and the material tells you a lot about how much life the line has left. Both of the side sewers we lined in Seattle this fall, in Greenwood and in Rainier View, were old concrete. Our Seattle sewer line page tells both stories.
2. Roots at the joints
Roots find their way into joints and keep growing. In Rainier View, they had worked into the line right where the cast-iron pipe from the house met the old concrete side sewer, and the repair started with cutting out that joint.
3. Breaks, separations and sags
In Clyde Hill in July, Bradyn's camera found water standing in the line for about 100 feet and a separation where the pipe leaves the house, and he located it on the ground for the repair. Caleb later reworked that connection and installed a backwater valve with a cleanout on each side of it, so the line can be cleaned from either direction.
4. Whether the line is shared
In Seattle, a side sewer can join a neighbor's line before it reaches the main, and from that junction the owners share the repairs. In Matthews Beach in October, Caleb's camera stopped at a blockage under the neighbor's yard, on a stretch that SPU's side sewer map shows as shared. That's worth knowing before you take on a share of it.
5. Whether there's a way in
A scope needs a cleanout. In Sammamish in September, Caleb arrived for a pre-sale scope and couldn't find an accessible cleanout outside, and the cleanout on the kitchen line in the crawlspace was too full of sludge for the camera to see anything. He recommended pulling a toilet to reach the main and cleaning the kitchen line. In Mill Creek in October, Alex did that kind of visit: he pulled and reset a toilet and scoped the sewer line with the camera.
6. How much of the repair would be yours
That depends on the city. In Seattle, Kirkland and Redmond, the owner's side sewer runs all the way to the public main, even under the street. Bellevue maintains the part of the connection in its right-of-way, and Issaquah maintains the main and the fitting where the house line joins it. Our Eastside sewer answers cover permits and costs city by city.
7. Whether you need a different inspection
If the house is on septic, as many valley homes are, the scope isn't the whole story. King County requires an inspection by a licensed maintainer when a house on septic is sold. A camera on the line from the house to the tank can still find a settled section sloping the wrong way, like the one we found near Lake Marcel in September and wrote up on our Carnation sewer page.
What a Scope Visit Looks Like
In late September, a buyer's agent called us one evening because her clients' home inspector had raised possible root intrusion in the sewer line of a house in North Seattle, and their contingency deadline was close. We had Alex there the next morning. He ran the camera through the outside cleanout and talked her through what he saw, and the video went to the buyers. Here is her review, as she wrote it:
"Alex was awesome! I was the Buyer's Agent for a home purchase in North Seattle and my clients got concerned during their home inspection about possible root intrustion in the sewer line and they wondered if we could get a sewer scope on short notice. I made the request that evening and Lighthouse called me 5 minutes later and confirmed they could get someone in the next morning, which fit perfectly with our contingency timeline. Alex was awesome getting their so promptly in the morning and running a detailed line down the clean out and was super real on what to expect with our findings. He didn't try to sell me anything additional and was very transparent into what my Buyers were walking into and accessing the video was so easy to view and send to my Buyers. I would 100% recommend Alex and Lighthouse plumbing for any plumbing/sewer needs, they are on top of it, fast and thorough! Thanks again Alex for a great experience!"
Megan B., buyer's agent, North Seattle ★★★★★
Frequently Asked Questions
How much does a sewer scope cost?
On our 2026 invoices, a sewer camera inspection on its own ran about $300 to $650, tax included. It runs higher when there's no cleanout and a toilet has to come up to reach the line, about $700 for the Mill Creek scope, and a line that has to be cleared before the camera can see costs more again.
How long does a sewer scope take?
Usually under an hour on site. The North Seattle scope through an outside cleanout took about 15 minutes, Bradyn's Clyde Hill camera inspection with locating took under an hour, and the Mill Creek scope that meant pulling and resetting a toilet took about 50 minutes. You get the video to share with your agent.
What should we do if the scope finds a problem before closing?
Get the findings in writing while you're still inside your inspection window: what was found, how far from the cleanout, how deep, and a price to fix it. Your agent can use that to ask the seller for a repair or a credit. SPU recommends getting at least three bids before any side sewer repair begins.
Does a house on septic need a sewer scope?
It needs a septic inspection first. King County requires one by a licensed maintainer when a house on septic is sold, and that looks at the tank and the system. A camera on the line from the house to the tank is still worth adding if drains are slow, because settling there can leave a section sloping the wrong way.
Our Recommendation
Scope the sewer on any house you're serious about, unless it's on septic, where the septic inspection comes first. Ask for the video, not just a summary, and for the distance from the cleanout to anything the camera finds. If it shows roots at a joint, a separation where two pipes meet or a section sloping the wrong way, get a repair price before your inspection contingency runs out. And if you're buying in Seattle, ask SPU whether the line is shared before you close.
Book a Sewer Scope
Call 425-549-2400 or schedule an appointment.
More: sewer line repair in Seattle · sewer line repair in Carnation · sewer line questions and costs · sewer line services · well and septic plumbing in the valley