Laundry Room Plumbing Rough-In Cost (2026 Guide)
💰 Cost Breakdown
| Item | Low | Average | High |
|---|---|---|---|
| Basic Washer Hookup (Near Existing Plumbing) Hot and cold supply lines, shut-off valves, a recessed washer outlet box, and a 2-inch standpipe drain connected to an existing drain stack within 10 feet. Includes braided stainless supply hoses. | $500 | $800 | $1,200 |
| Washer Hookup (Remote Location or Second Floor) Full rough-in including extended supply lines, new drain line run to the main stack, and a dedicated vent pipe through the roof. Required when the new laundry location is more than 15 feet from existing plumbing or on a different floor. | $1,500 | $2,000 | $2,500 |
| Utility Sink Installation (Add-On) Adding a utility sink next to the washer. Includes a freestanding or wall-mounted laundry sink, faucet, P-trap, and tie-in to the washer's drain and supply lines. Sink fixture cost not included. | $300 | $450 | $600 |
| Washing Machine Drain Pan and Overflow Drain A sheet-metal or plastic pan under the washer with a dedicated drain line to prevent water damage from leaks or hose failures. Required by code in many areas for second-floor laundry rooms. | $100 | $200 | $350 |
| Washer Outlet Box (Recessed) A recessed box that mounts between wall studs, housing the hot/cold valves, drain connection, and supply hoses. Keeps connections behind the washer clean and accessible. Includes hammer arrestors. | $75 | $125 | $200 |
| Plumbing Permit and Inspection Most jurisdictions require a permit for new plumbing rough-in. The rough inspection happens before walls are closed. Permit fees and requirements vary by municipality. | $50 | $150 | $250 |
Basic Washer Hookup (Near Existing Plumbing)
Hot and cold supply lines, shut-off valves, a recessed washer outlet box, and a 2-inch standpipe drain connected to an existing drain stack within 10 feet. Includes braided stainless supply hoses.
Washer Hookup (Remote Location or Second Floor)
Full rough-in including extended supply lines, new drain line run to the main stack, and a dedicated vent pipe through the roof. Required when the new laundry location is more than 15 feet from existing plumbing or on a different floor.
Utility Sink Installation (Add-On)
Adding a utility sink next to the washer. Includes a freestanding or wall-mounted laundry sink, faucet, P-trap, and tie-in to the washer's drain and supply lines. Sink fixture cost not included.
Washing Machine Drain Pan and Overflow Drain
A sheet-metal or plastic pan under the washer with a dedicated drain line to prevent water damage from leaks or hose failures. Required by code in many areas for second-floor laundry rooms.
Washer Outlet Box (Recessed)
A recessed box that mounts between wall studs, housing the hot/cold valves, drain connection, and supply hoses. Keeps connections behind the washer clean and accessible. Includes hammer arrestors.
Plumbing Permit and Inspection
Most jurisdictions require a permit for new plumbing rough-in. The rough inspection happens before walls are closed. Permit fees and requirements vary by municipality.
📊 Factors That Impact Cost
Distance from Existing Plumbing
High ImpactThe single biggest cost driver. If the new laundry location is directly behind or above an existing bathroom, the plumber can tap into those lines cheaply. Moving across the house or to a location far from the main drain stack requires long pipe runs and possibly a new vent through the roof, doubling or tripling the cost.
Floor Level
High ImpactSecond-floor and basement laundry rooms each add complexity. Second-floor installations require robust drainage and a drain pan (often code-required). Basement installations may need an ejector pump ($800–$2,000) if the drain is below the sewer line.
Wall Access and Finish Work
Medium ImpactIf the plumber needs to open finished walls to run pipes, drywall repair adds $200–$800 to the total project. Unfinished basements and new construction avoid this cost entirely.
Local Code Requirements
Medium ImpactSome municipalities require a separate drain vent for the washer standpipe, hammer arrestors in the supply lines, or specific pipe materials (copper vs. PEX). These requirements affect both material and labor costs.