What We Cover in This Article:

  • What You’re Allowed to Drill Through in a Wood Frame Setting

What You’re Allowed to Drill Through in a Wood Frame Setting

You may think, “Oh, this is a silly post”..

But believe me! – I’ve seen this stuff first hand when co-workers drill through or cut the wrong thing.

So, I’m going to keep this short and brief, but please do not take this lightly.

By drilling into/cutting the wrong thing, it can open a huge can of worms, get an engineer involved, be very costly, and be a really embarrassing moment for you.

Please note, this is my disclaimer:

I will not be held liable for things you can and cannot drill through, the outcome or financial burden of your situation. Please make sure to ask your boss/site general before proceeding with drilling/cutting.

Let’s first start with what we can drill through.

What Electricians Can Drill Through

When pulling our wire as electricians, most things are pretty safe to drill through; it’s mostly structural beams and trusses which are big no-no’s.

But your standard 2×4 and 2×6 stud walls which we mount our boxes on are usually safe! (Always check the other side of the stud before drilling! There might be wires!)

Here’s a picture of a safe 2×4 wall to drill through:

Here is a common 2×4 wall which we mount our device boxes on. These are usually very safe to drill through, just make sure to check the other side of the 2×4 before drilling!


I know it may be hard to tell, but here’s a 2×6 wall:

Now, these 2×4 and 2×6 walls also have top and bottom plates. These are also safe to drill through if we need to pull our wires down to a switch or into the basement.

On a side note, NEVER run your wires on a top plate. When people drill, they usually do not double check a top plate because nothing should be there. This is a serious no-no.

But with bottom plates I usually walk downstairs and take a quick peak just to make sure no wires or other materials are in the way of your drilling.

This is an example of a top plate which we can drill through to pull our wires down.


Things Electricians Cannot Drill Into!!

Remember, if you’re unsure, ask before you drill!

Here’s some examples of what you cannot drill into:

Structural Beams / Load Bearing Support Beams:

This is a structural support beam which is load-bearing. Do not drill through these!


Sometimes these structural beams are yellow, but sometimes they aren’t!

Support beams are usually pretty obvious because the type of wood looks different and is installed in such a way that it is a crucial part of the building to hold up weight.

Besides the color of these structural beams, their height is often quite big, too; like 14″ in height for example!

I personally suggest you don’t drill through these beams ever. I have been on a site where it’s been approved to drill a small hole in this structural beam, but it’s important to make sure all the paper work is in place and everything is signed.

I’d rather find an alternative path around a support beam myself, even if it requires more wire.

On a side note – I was once on a job where someone sawzalled just a little bit of the floor joists just to get a light box to fit in a better place. (This was an embarrassing moment for that person and involved phone calls from the higher ups.)


Trusses are only on the top floor of a building. NEVER drill through these. As an electrician, our top floor is typically our fastest because we can simply pull our wires on top of the trusses and staple on top of them, rather than having to drill all of our holes!


Just another truss example!


Trusses are only on the top floor of a building. They are what the actual roof attaches to.

NEVER drill through these.

As an electrician, we can pull our wire on top of trusses and staple on top of them.

Your top floor is actually your fastest floor because the amount of holes you have to drill is dramatically reduced because you can simply pull your wires on top of the trusses instead of having to drill holes like we do on lower floors or basements!

Conclusion on Things We Can Drill Through

And so there you have it.

Those are your most common things you’ll see in a wood frame setting, from my experience.

If you’re ever unsure, just ask. It’s really as simple as that.