How to Plumb for an Outdoor Kitchen

Make your outdoor living space more functional by adding a kitchen. Learn how to install plumbing with our step-by-step instructions.

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Most people want a grill on their deck or patio. And adding a small sink nearby helps with food preparation and reduces trips in and out of the house. Plus, a gas barbecue unit that's built into a tiled countertop gives the cook plenty of convenient cooking and prep space. Luckily, an outdoor kitchen unit can meet all of these needs—and we'll show you how to build one. 

A basic outdoor kitchen has a cabinet and countertop, topped with a sink supplied with hot and cold water. The drain runs into a dry well. When building the unit, construct the cabinets and countertops to resist weather. Unless you live in a very dry climate, provide an awning or some other shelter from rain so the outdoor kitchen is at least partially protected. If you have freezing winters, install plumbing that can be drained in the fall. Be sure you can shut off water from inside the house. The drain line shown here runs to a simple dry well and needs no venting.

Set aside a day to run plumbing and a gas line for the sink and barbecue. Before you begin, you'll need to plan the location for your outdoor kitchen and build the cabinet unit. 

Our Favorite Outdoor Kitchen Ideas

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What You Need

  • Groove-joint pliers
  • Screwdriver
  • Level
  • Shovel
  • Posthole digger
  • Hole saw
  • Tools for joining copper and plastic pipe
  • Sink
  • Gas-fired barbecue
  • Supply pipes and fittings
  • Drain pipes and fittings
  • Trap
  • Garbage can
  • Gravel

Step 1: Run Supply Line

From inside the house, run supply pipe designed for outdoor use. Slope the pipes slightly to help them drain. Install shutoff valves with drain plugs at the lowest point. Attach the pipes firmly with two-hole clamps every 4 feet or less.

Step 2: Connect House and Kitchen

Run the supply pipe through the house wall and to the outdoor kitchen, routing up through the bottom of the sink/grill base cabinet. Sweat male threaded adapters to connect with the supply tubes for the sink.

Step 3: Install More Pipes

Install a PVC drainpipe and adapter for the sink trap. To supply a barbecue with natural gas, run pipe that is code-approved for exposed outdoor gas lines in your region. Some barbecues may require a gas regulator. Install the sink and trap.

Step 4: Dig Dry Well

Dig a hole for a dry well at least 10 feet from the patio or deck (check local codes). Dig a trench to it that slopes down and away from the house. Run the drain line—1-1/2-inch PVC probably will be acceptable—in the trench. Check that it slopes at a rate of at least 1/4 inch per foot.

Step 5: Fill Dry Well

Punch or drill a grid of holes, about 1/2 inch wide, in a garbage can. Set the can in the hole; its top should be 2 inches below grade. Mark where the pipe will enter and cut a hole for the pipe. Set the can back in the ground, install the pipe into the hole, and fill the can with coarse gravel.

Choosing the Right Materials

Codes for outdoor plumbing can vary widely from area to area (and even from one town to the next), so check with your local building department before buying any pipes and fittings.

Among the options for supply pipes, PEX and CPVC are easy to run. If you install copper pipe, choose Type L or K, which are thicker and stronger than Type M.

PVC is the standard choice for drainpipe. You may want to run perforated drainpipe underground; this will allow some water to percolate out along the way to the dry well.

Gas pipe options include aluminum composite pipe, and certain types of copper, green-coated steel, galvanized steel, and schedule 80 PVC (which is stronger than standard schedule 40).

How to Choose a Supply Tube

Flexible plastic supply tubes are the least expensive but are not allowed by code in some areas. Plain copper and chrome-plated tubes are long-lasting but require careful measuring, cutting, and bending. Braided tubes are long-lasting and are the easiest to install.

How to Install a Hot Water Dispenser

As an alternative to bringing hot water all the way from the house, install a hot water dispenser. This simple plug-in unit fits easily in the cabinet. With it, you need only run a cold water line outdoors; a saddle tee and branch line run to the dispenser. It is designed to supply nearly boiling-hot water, but you can turn the thermostat down to 140 degrees, which is within the range of normal hot tap water.

You will have to run 120-volt GFCI-protected electrical line to the unit; use only outdoor cable.

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