Can You Hole Saw a Kitchen Sink Drain or Cabinets?

What a hole saw can and cannot do in a kitchen

A hole saw cuts a round hole by spinning a toothed cylinder around a center pilot bit. It works well in flat stock such as cabinet panels, plywood and drywall. It does not work well on a curved pipe, because the teeth catch on the round wall and the saw can grab and kick.

So the question depends on what you mean by the sink drain. The cabinet around the drain is an easy job. The sink bowl is possible in some materials. The drain pipe is a different tool altogether.

• Cabinet back, side or floor panels: yes, with a wood or bi-metal saw.
• Stainless steel sink deck: yes, with a metal-rated saw and cutting oil.
• Porcelain, granite or quartz: not with a standard saw. These need diamond tooling.
• Drain pipe or trap: no. Cut it with a pipe cutter or fine-tooth saw.

Cutting cabinet panels for drain and supply lines

Most sink base cabinets ship with a solid back and no openings. You cut the holes you need. A drain line commonly passes through a hole of about 2 to 2.5 in, but measure your own pipe and add a little clearance so the pipe does not rub the edge.

Supply lines are smaller. A hole of around 1 to 1.5 in is typical for each, though you should check your shutoff valves and hose fittings first. Mark the center of each hole from the actual wall stub-out positions, not by eye.

One good method is to drill a small pilot hole through the back panel at each marked center. You can then see where it lands against the wall and finish the cut from the inside of the cabinet. This keeps the hole lined up with the plumbing.

Step-by-step: opening a sink base

Empty the cabinet and take out the shelf if there is one. Work with good light and a clear floor.

• Turn off the water at the stops and open the faucet to release pressure.
• Unplug the garbage disposal, or switch off its breaker, before reaching near it.
• Measure from the wall stub-outs to the panel and mark each center point.
• Drill a pilot hole at each center, then check where it lines up.
• Fit the hole saw to the arbor in your drill. Match the speed to the material, slower for metal and faster for wood.
• Clamp or brace the panel, hold the drill square and let the teeth do the work with light pressure.
• Stop when the pilot bit pokes through. Finish from the other side if the panel is thick or chips easily.
• Clear the plug, sand the edge and test fit the pipe.

Hole sawing a sink itself

A stainless steel sink can take a hole saw for an extra faucet, soap dispenser or air switch hole. Use a saw rated for metal. In our data, the dashap 27 piece carbide kit lists cuts in 3 mm stainless steel and tells users to apply oil or coolant at speed. The EZARC kits list thin metals, and the Bosch kit uses M42 cobalt bi-metal saws that are listed for metal as well as wood.

Check your sink first. Sink steel varies in thickness, and a carbon steel blade, like the one in the KATA kit, is listed for wood, drywall and thin plastic only. That kit says it is not meant for thick metal, tile, concrete or stone. Use a center punch to keep the pilot from walking and go slowly to avoid heat.

Porcelain, granite, composite and quartz sinks are a poor fit for a standard hole saw. They crack or chip easily. Use a diamond hole saw or have a pro do the cut, and never cut a stone countertop around a sink without the right bit.

Picking a saw from our kit data

Which kit suits you depends on the hole size and material. Our best hole saw kit page lists the full specs, and the table below pulls out the ones that matter for sink work.

Watch the cutting depth. A single cabinet panel is thin, so even a 1 in depth is enough. Some kits do not list depth at all.

Safety checks before you cut

Wear safety glasses, because chips and metal shavings fly. Wear hearing protection when you cut metal, and keep loose sleeves and jewelry away from the drill. A saw that binds can twist the drill hard, so keep a firm grip and a stable stance.

Look behind the wall before you drill through. Kitchens can hide electrical cable, water pipes and in some homes a gas line. Cut shallow where you can, and stop if you feel resistance that is not wood. If you are unsure, shut off the circuit or call a pro.

Keep corded tools away from water. Use a GFCI outlet near the sink, and dry the area before you plug in.

Finishing the cut edges

Raw particleboard and plywood soak up moisture from under-sink leaks. Sand the cut edge smooth and seal it with a thin coat of primer or paint. If you are repainting the cabinet anyway, our best paint for kitchen cabinets page can help you pick a finish.

If you are updating the doors at the same time, remember that knob and pull holes use a regular drill bit, not a hole saw. Our guide to the best hardware for white kitchen cabinets covers the styles that go with a white finish.

Frequently asked questions

What size hole saw do I need for a sink drain pipe opening?

Many drain openings are around 2 to 2.5 in, but measure your pipe and add clearance. Choose a kit that reaches that size, since some stop at 2 in.

Should I drill from the front or the back of the panel?

Drill a pilot hole first, then finish from the side that gives the cleaner edge. Cutting from the inside of the cabinet keeps the visible side tidy.

Can I use a hole saw on a plastic drain pipe?

It is not a good idea. The curved wall grabs the teeth. Use a pipe cutter or fine-tooth saw instead, and cut only after shutting off water and draining the trap.

Do I need cutting oil?

For metal, yes. The dashap listing advises oil or coolant at high speed. Wood does not need it.