A sewer scope on a detached house is simple in one respect: the buyer owns the lateral from the house to the street and the inspection covers all of it. A condo or townhome divides the drainage between the unit owner and the association in ways that differ by building and by state, and the inspection has to be planned around that division. The question is not only what the camera finds but whose problem it is.
Quick answer: read the declaration and plat to learn where the unit’s plumbing ends and the common elements begin; in most condos the owner is responsible for pipes serving only their unit, and the association for shared stacks, building drains and the lateral. Scope the unit’s own branches from its fixtures or cleanouts, ask the association for its inspection records and reserve study for the shared drainage, and treat a building with old cast iron and no drainage reserve as a special assessment risk. Townhomes with individual laterals are inspected like houses.
Who owns what
Condo declarations typically define the unit as the space inside the walls and assign pipes serving only that unit to the owner, with everything serving more than one unit as a common element maintained by the association. Some declarations assign the lateral under a townhome to the owner; some keep it common. The plat and declaration are the authority, not the listing agent. Ask for them before scheduling any inspection.
What the unit owner can scope
Branch lines from the unit’s fixtures to the stack: kitchen, bathrooms, laundry. In a stacked condo these are short and the camera enters through a pulled toilet or a trap arm. Findings are usually grease, scale and poor venting, and they are the owner’s to fix. In a townhome with its own lateral to the street, the lateral is inspected as for a house, from a cleanout to the main. See cleanout vs vent vs toilet entry and small-diameter drain cameras for the equipment the short branches need.
What the association controls
The stacks, the horizontal building drain in the basement or crawlspace, and the lateral or laterals to the street. A buyer usually cannot scope these without permission and often cannot at all. What a buyer can do is ask: when were the stacks and drains last inspected, is there footage, what material are they, what repairs have been done, and what does the reserve study say about drainage.
Reading the reserve study
A reserve study lists the building’s components, their remaining life and the money set aside. Cast iron stacks and drains in a building from the 1960s or 1970s are near the end of their life, and replacement is a major project. A study that lists drainage with a realistic life and a funded reserve is reassuring; one that omits drainage or has it at a hundred years is a special assessment waiting to happen. See cast iron priorities.
Townhomes with shared laterals
Attached townhomes sometimes share a lateral between two or more units, with the arrangement in the declaration or an easement. A blockage in the shared section is everyone’s problem and the agreement says who pays. Scope the shared section if access allows, and read the agreement. Private lateral responsibility covers the same issue for houses.
Signs of trouble in a building
Backups in lower units, especially ground-floor and basement units that take everything from above when the building drain blocks. Minutes that mention plumbing. A history of special assessments. Scale and slow drains in the unit’s own branches, which suggest the same in the stack. A ground-floor unit in an old building with cast iron is the one that floods.
Insurance
The association’s master policy covers common elements; the unit owner’s HO-6 policy covers the unit. Sewer backup into the unit from a common drain is a grey area that depends on both policies and the declaration. Ask both insurers before closing.
What to ask for
The declaration and plat. The last drainage inspection and footage. The reserve study. Minutes for the past two years. Any plumbing special assessment history. The association’s answer to whether the unit has had backups. All of it is routinely available to a buyer under contract.
What to record
The unit branch footage with distances and entry points. The documents received. The association’s answers in writing. Where the ownership boundary falls. A future dispute about a backup is decided by the declaration and the evidence of condition at purchase.
Ground-floor units in old buildings
The unit most exposed to drainage failure in any attached building is the lowest one, because a blockage in the building drain sends everything from the units above into its fixtures and floor drains. A buyer looking at a ground-floor or basement unit in a building with cast iron drains should weigh that exposure specifically: ask the seller and the association about backups into that unit, look for replaced flooring and tide marks in closets and utility areas, and read the HO-6 policy for a sewer backup rider. A top-floor unit in the same building faces the same assessment risk but not the same flood risk.
Who to ask
The property manager has the maintenance records and the vendor history; the board has the minutes and the reserve study; the seller has the unit’s own history. Ask all three and compare the answers.
Common questions
Can I get a sewer scope on a condo?
On the unit’s own branches, yes. On the shared stacks and drains, only with the association’s permission, and usually you rely on their records instead.
Who pays for a sewer backup in a condo?
It depends on the declaration and where the blockage was. Pipes serving only the unit are the owner’s; shared pipes are the association’s, subject to insurance.
Is a townhome scoped like a house?
If it has its own lateral, yes. If the lateral is shared, scope what you can and read the agreement.
Related guides
See multi-family and duplex purchases, the complete sewer scope guide, and pre-purchase inspection.