Kitchen Plumbing Rough-In Cost Guide for Plumbers
Kitchen plumbing rough-in costs range from $1,500–$3,500 for a standard kitchen with sink, dishwasher, and ice maker connections. Relocating the kitchen or adding a prep sink or pot filler pushes costs to $3,500–$7,000. Labor accounts for 60–70% of the total, with materials running $400–$1,200 depending on pipe type and fixture count.
Kitchen plumbing rough-ins are complex coordination jobs that require precise planning around cabinetry, countertops, and appliance locations. Whether you are working on a new construction project or a kitchen remodel, getting the rough-in right the first time prevents expensive callbacks and keeps the GC's schedule on track. This guide covers how to price kitchen rough-in work accurately.
Standard Kitchen Rough-In Pricing
A standard kitchen rough-in includes hot and cold supply lines to the sink location, a drain and vent for the sink, dishwasher supply and drain connections, ice maker supply line, and often a gas line for the range. Material costs for a standard kitchen rough-in run $400–$800 using PEX supply lines (Uponor or SharkBite brand) and PVC or ABS drain/waste/vent piping. Plan 8–16 hours of labor for a two-person crew to complete all rough-in work including supply, DWV, and gas. Your total to the client should be $1,500–$3,500, with higher prices in markets with elevated labor costs. Always coordinate rough-in locations with the cabinet layout — getting stub-out positions wrong by even 2 inches can cause problems during trim-out.
Kitchen Relocation and Layout Changes
When a kitchen is being relocated or the layout significantly changed, rough-in costs increase substantially. Moving a kitchen sink more than 5 feet from its current position typically requires extending both supply and drain lines, and may require a new vent stack or air admittance valve (where code permits). On slab foundations, drain relocation means cutting concrete — add $1,000–$2,500 for sawcutting, excavation, new pipe installation, and concrete patching. On wood-framed floors, routing new drains through joists is more straightforward but still adds $500–$1,500 in labor. Total for a kitchen relocation rough-in runs $3,500–$7,000. Always verify the new drain path can maintain proper slope (1/4 inch per foot minimum) before committing to a price.
Specialty Fixture Rough-Ins
Modern kitchen designs often include specialty fixtures beyond the standard sink. A prep sink or bar sink adds $400–$800 for supply lines, drain, and vent. Pot fillers — wall-mounted faucets above the range — require a cold water supply line stubbed out at 48–52 inches above the finished floor, typically adding $300–$600 for the rough-in. Instant hot water dispensers (like InSinkErator) need a dedicated hot supply and electrical outlet under the sink — the plumbing portion runs $150–$300. Commercial-style fixtures like pre-rinse spray faucets may require higher-flow supply lines (3/4-inch vs. 1/2-inch) and reinforced mounting. Price each specialty fixture as a separate line item so clients can see the cost of their design choices.
Drain, Waste, and Vent Considerations
The DWV system is the most complex part of a kitchen rough-in. Kitchen sinks require a 2-inch drain line (1-1/2 inch minimum by code, but 2-inch is standard practice) with proper venting — either a direct vent through the roof, a wet vent, or an air admittance valve (AAV) where permitted. Dishwasher drains must connect with a high loop or air gap to prevent backflow. Garbage disposals connect to the same drain line but may require an upsize if combined with a double-bowl sink. If you are adding an island sink, the venting challenge is significant — island venting typically requires a loop vent or AAV since there is no nearby wall to run a vent stack. This complexity should be reflected in your pricing: island sink rough-ins add $500–$1,000 above a standard wall-adjacent sink.
Coordinating with Other Trades
Kitchen rough-in work must be tightly coordinated with the general contractor, electrician, and cabinet installer. You need the cabinet layout before you can set stub-out locations — center-of-sink dimensions, dishwasher location, and ice maker position all depend on the final cabinet plan. Request the cabinet shop drawings before your rough-in date and confirm measurements for sink base width, dishwasher opening, and appliance locations. If the countertop is stone, coordinate with the fabricator on faucet hole locations and sink cutout dimensions. Communication failures here lead to rework that eats your margin. Build 2–4 hours of coordination time into your estimate for meetings, layout verification, and potential adjustments.
Material Selection and Cost Impact
Your material choice impacts both cost and installation speed. For supply lines, PEX tubing (Uponor AquaPEX or SharkBite) runs $0.50–$1.50 per foot and installs significantly faster than copper ($2–$5 per foot) due to fewer fittings and no soldering. Most codes now accept PEX for interior supply lines, making it the standard choice for rough-in work. For DWV, Schedule 40 PVC is the most common choice at $1–$3 per foot, with ABS used in some regions. For gas lines, black iron pipe ($3–$6 per foot) or CSST flexible tubing ($5–$12 per foot) are both code-approved options. Use PEX manifold systems when running multiple supply lines from a central location — they reduce fittings and make future service easier. Total material cost for a standard kitchen rough-in is $400–$1,200 depending on your choices.
Frequently Asked Questions
A standard kitchen plumbing rough-in takes 1–2 days (8–16 hours) for a two-person crew. This includes supply lines, DWV piping, gas line if needed, and all fixture connections. A kitchen relocation or complex layout with multiple specialty fixtures can extend to 2–3 days. Factor in additional time for inspections and any required coordination with other trades.
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