How to Install a Basement Utility Sink

A utility sink needs supply, drain, and vent. If the laundry stack is close, this is a one-day job.

Common causes

• Basement laundry with no utility sink
• New workshop or dog-wash station
• Freezer defrost drainage
• Extra prep sink near a bar

Step-by-step

1. 01Locate the nearest laundry stand pipe or waste stack
2. 02Wet-vent or air-admittance valve depending on code
3. 03Tap into supply with tees and quarter-turn shut-offs
4. 04Set the sink and tie into the P-trap into the branch

When to call Northbridge

• No accessible stack within 6 feet
• Drain run needs a pump (below-grade)
• Vent must go through a finished wall or ceiling
• Adding a laundry rough-in at the same time