Property guide · Chicago

Plumbing in condos and high-rises

In a condo, the first question is often whose pipe it is. The second is what the building allows. Here is how responsibility and access usually work.

Call for plumbing help(866) 202-9655

Calls are answered by a referral service that connects you with a local plumbing provider. How this works

Owner vs association

Who typically handles what (check your declarations)
Part	Usually	Notes
Fixtures, faucets, toilets inside the unit	Unit owner
Supply lines and valves after the unit shutoff	Unit owner	Varies by declaration
Risers and stacks	Association	Shared by many units
Building water heaters, pumps, sewer	Association
In-unit water heater	Unit owner	Where buildings have them

Condo declarations and bylaws control; this is a general pattern.

Water stain and opened ceiling below an upstairs bathroom in an older apartment — Illustration

Leaks into the unit below

Diagram Why a leak or clog in one unit can become a problem for another.

Shared drain-waste-vent stack — a clog or crack affects every unit above it; older buildings often have cast iron.
Shared water riser — corrosion and scale in older galvanized pipe can reduce pressure for all units.
Garden/basement unit — lowest fixtures, so most exposed to backups.
One building sewer serves the whole building.

Simplified schematic, not to scale. Actual layouts vary by building.

Common sources are shower pans and tub drains, toilet seals, supply lines to sinks and toilets, dishwashers, washing machines and in-unit water heaters. Stop the water at the fixture or unit shutoff, tell management, and document everything for insurance. Leak detection

Building rules for contractors

Certificates of insurance naming the association.
Approved work hours and elevator reservations.
Building engineer present for riser shutoffs.
Permits for work that requires them — the contractor must hold City licensing.

Prevention in units

Know where your unit shutoff valves are.
Replace rubber washing-machine hoses with braided ones; check them periodically.
Consider leak sensors under sinks, the dishwasher and water heater.
Report slow drains early — the stack serves your neighbors too.

Frequently asked questions

Can I hire my own plumber in a condo?

For work inside your unit, usually yes, subject to building rules. Work on risers or shared lines is arranged by the association.

Who pays when my leak damages the unit below?

That depends on the declarations and insurance policies involved. A plumber can document the source.

Sources

City of Chicago — Does my project require a licensed plumbing contractor? Official / primary
City of Chicago DOB — Plumbing Contractor License Official / primary

Information can change; official sources control.