Extension cords with dimmer switches are usually a bad idea.

No, you shouldn’t generally use an extension cord with a dimmer switch.

It’s not just about tripping over the cord. Dimmer switches are finicky. They rely on a clean, consistent electrical load to work properly. Adding an extension cord introduces extra resistance and can mess with the dimmer’s ability to sense the load. You’ll likely get flickering, poor dimming range, or the lights just won’t work at all.

Bigger risk: many dimmers (especially older or cheaper ones) need a neutral wire. Most extension cords don’t have one. If you plug a dimmed lamp into an extension cord that doesn’t support the neutral path, you’re basically asking for a voltage drop or a short. Also, if the cord is too long or underrated for the wattage, you can overheat the cord or the dimmer. That’s a fire hazard.

If you absolutely have to move a light farther from the wall, use a heavy-duty cord (12 or 14 gauge) that’s as short as possible, and make sure the dimmer is rated for the total load including the cord’s losses. Even then, it’s a hack, not a permanent solution.

Don’t risk a fire or a fried dimmer just to move a lamp a few feet.