How to Cut Plumbing Holes for a Sink Base

The sink base is the centerpiece of your kitchen cabinet package. As such, it must be properly installed if the rest of your base cabinets are to fit properly. Installing the sink base requires cutting three plumbing holes in the rear of the base to accommodate two water pipes and one drain pipe. Cutting plumbing holes is well within the ability of a competent do-it-yourselfer with a set of basic tools.

Measuring tape
Carpenter's pencil
Power drill
Hole saw

Instructions

- 1
  Measure the distance from the end of the sink base to the center; standard sink bases are 36 inches wide, so draw a center line down the the rear of the base 18 inches from the end.
- 2
  Measure along the wall to find the distance from the floor to center of the drain pipe and from the floor to the center of each of the two water supply lines.
- 3
  Mark the floor-to-drain distance on the center line at the rear of the sink base. Mark the floor-to-supply line distance on each side of the center line; the two marks should be equidistant from the drain mark.
- 4
  Screw the hole saw onto the power drill. Press the saw against the drain hole mark on the sink base. Squeeze the drill trigger gently with one hand while holding the saw against the cabinet rear with the other. Press against the cabinet until the saw cuts through the rear of the sink base. Repeat at the supply holes.
- 5
  Slide the base onto the pipes to make sure the holes are aligned. Cut more cabinet away if the holes are off.

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