How to Drill Holes in Concrete Foundations

Written by larry simmons
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How to Drill Holes in Concrete Foundations
Drilling holes in concrete will require a specialised drill bit. (drill bits image by robert mobley from

Working with concrete foundations means that you will sometimes have to drill holes in the slabs. Concrete is a strong and durable material. Drilling into a foundation without the proper tools can have disastrous results, including broken tools, a marred concrete surface and at worst, personal injury. Using the proper tools and procedures will ensure that you can drill holes into a concrete foundation both quickly and safely.

Skill level:
Moderately Easy

Things you need

  • Safety goggles
  • Dust mask
  • Work gloves
  • Ear protection
  • Chalk
  • Hammer drill
  • Carbide-tipped drill bit
  • Masking tape
  • Wire brush
  • Shop vac

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  1. 1

    Put on your safety gear to protect your health while drilling. Wear safety goggles, a dusk mask, work gloves and ear protection during the drilling process.

  2. 2

    Mark the spot where you wish to drill the hole with a piece of chalk.

  3. 3

    Insert the carbide-tipped drill bit into the drill. Mark the depth of the hole you wish to drill on the bit with a piece of tape. The bottom of the tape represents the desired depth line.

  4. 4

    Place the tip of the drill bit on the mark at a 90-degree angle so that you drill the hole straight into the concrete foundation.

  5. 5

    Trigger the drill, holding the bit onto the mark with enough pressure to keep it from moving. Slowly guide the drill bit as it begins to drill the hole in your foundation. Maintain a slow drilling speed until about 1/2-inch deep. Increase the speed of the drill as you continue drilling the hole. Drill into the foundation until you reach the depth marked by your tape. Pull the drill from the hole.

  6. 6

    Clean the concrete dust from the hole using the wire brush or a shop vac.

Tips and warnings

  • The drill bit is hot after use, so allow the bit time to cool before touching.
  • The older the foundation, the more difficult it will be to drill into.

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