Wiring a bathroom fan and light on one switch can seem daunting, but it can be a relatively easy task with the right instructions. This article will provide you with a step-by-step guide to wiring your bathroom fan and light on one switch.

So whether you are replacing an old fixture or installing a new one, follow these instructions for a quick and easy installation. Before wiring in a separate switch for the lighting circuit, check to see if an “intercepted” wire exists or can be installed.

How to Wire a Bathroom Fan and Light on One Switch, Zazzy Home

This is where part of an existing circuit is already wired through another circuit breaker box location so that the second fixture will power on with either one turned on. If there isn’t an intercepted wire available, then install a new grounded electrical box next to the ceiling fan and run new wiring from that box down to your existing opening – this way, both circuits are combined into one path.

Creating pigtails

Pigtail wires are wires that have been twisted together to create one long wire. This allows you to connect two cables together into one. For example, pigtail wires are necessary when wiring a bathroom fan and light on one switch, as it will allow you to connect the fan and light wires together.

The Pigtail wires will allow you to splice TWO wire cables together in order to connect two cables into one. The color of the wire depends on what kind is currently in your wall. Depending on your existing setup, you may need to twist together about 1 foot of the same colored wires (for instance, white with white), giving them a good tug to tighten after twisting together.

Remember that the black wire is used to carry the current back to the source.

If you are converting two switches in the same box to a switch, then you will need to use some of the pigtail wire. Cut a piece of the pigtail wire that is about 6 inches long and strip each end of the wire. Next, twist each end of the wire around the exposed copper wire on each cable.

Then, using a wire connector, twist together the two white wires, two black wires, and the two green wires. This will create one long wire that can be connected to the new switch.

Once the wiring is complete, it’s time to connect the fan and light. Connect the black wire from the fan to the black wire on the light, and connect the white wire from the fan to the white wire on the light. Finally, connect the remaining white wires together, and connect both ground wires to each other.

How to Wire a Bathroom Fan and Light on One Switch, Zazzy Home


1) Turn off the power at the main electrical box. Use a voltage tester to double-check that all power is off before you do any work.

2) Remove the old ceiling fan, carefully noting how it is wired into the existing electrical system (this can be important information for your remodeling contractor).

3) Disconnect the wires from the hot side of the switch with needle-nose pliers; disconnecting wires on twisted wire connectors may require a small flat screwdriver to release them. There should be two neutral and two hot wires coming from inside the ceiling box going up through a wire nut into a junction box near where the old light fixture was located. These are your “new” connections for wiring in your new bathroom light and fan together on the same switch, resulting in one circuit. (Note: For safety reasons, it is recommended to replace the connection with a wire nut at both ends)

How to Wire a Bathroom Fan and Light on One Switch, Zazzy Home

4) Make sure that all of your wiring connections are secure and tight before turning on the power again to test them out.

5) Turn the power back on and check for hot wires touching each other or anything else metal (including your electrical box); tighten any loose screws if necessary. Ensure everything is secure before moving on to the final steps. When you flick the fan’s light switch, the light should turn off and vice versa. If not, there may be an issue with your connections inside the junction box – consult a professional electrician if this is so

6) Replace the ceiling cover plate, mount your new ceiling fan, and then test it out.


There are two possible approaches that you can take to wire a bathroom fan and light on one switch.

The first method is a little trickier, but it is often the preferred option by many professionals because it involves less wiring.

The second method involves installing a new box next to your existing one and running new wires through both boxes, which results in two separate circuits – however, the installation of this requires more time and effort as well as additional materials, potentially increasing your overall cost.


Interior designer and home improvement blogger, Abby has over 20 years of experience in the field. After working as a designer in New York City, she moved to the suburbs and began blogging about her design projects and tips. Abby's work has been featured in magazines and online, and she is always looking for new ways to make her home look beautiful and inviting. In her free time, she enjoys spending time with her family and friends, cooking, and hiking.

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