How to Install a Dryer Vent Like a Pro in 8 Steps

For new installations, your municipality will likely require you to obtain a building permit before putting in a new dryer vent. Check with your local permitting office to get details for where you live to verify requirements before beginning any work.

But if you’re just fixing a leaky dryer vent or replacing a damaged vent pipe, you can reuse the existing exhaust hole in the side of the house (making this DIY even easier).

Planning a route for your dryer vent will depend on where your dryer is located, so you'll have to find and choose the most straightforward path to the exterior. This often involves positioning the vent out of an exterior wall and extending it above ground level. The maximum allowable distance and number of elbows vary by community but often tops out at 25 feet minus 5 feet for each elbow. 

To start, measure the distance from the dryer’s location to the point where the vent will exit the home. Add several inches for overlapping the duct ends. Make note of the number of elbows you’ll need. Remember that most dryer vent elbows can adjust their angle up to 90 degrees. While shopping for supplies, choose a wall vent cap that’s appropriate for your home's siding material.

First, create a pilot hole as a guide for choosing the exact spot to drill the vent exhaust hole. If you're replacing an existing dryer vent, you may be able to skip this step. Next, you’ll drill a pilot hole through the exterior wall using a long, thin-diameter drill bit. If the location is concrete or stucco, use a masonry drill bit. Be sure to adjust the pilot hole’s location if it’s too close to any mechanical components. 

Once you’re happy with the vent location, grab your hole saw to create a larger hole for the vent pipe. Use a 4 and 1/4-inch hole saw and start drilling from the outside of your house (if your siding material allows) as a guide. Then, finish drilling the hole from the inside.

For masonry or stucco siding, use a small masonry drill bit to drill successive holes around a 4 and 1/4-inch circle in the location about 1/4 to 1/2 inches apart. Next, use your cold chisel and hammer to break away the material until you form a hole.

To install a wall vent cap, slide the duct side into the hole and fasten it with the screws that came with the vent, exterior grade screws, or concrete screws for masonry or stucco siding. Use the exterior grade caulk to seal the edges of the vent to the wall.

Now, go back inside the house. The easiest way to connect your parts is to start at the vent cap pipe and work your way toward the dryer. 

Connect the first section of the duct (or the first elbow) to the vent cap pipe with a dryer vent clamp and screwdriver. Join the open edges of the straight duct pieces together by overlapping them and inserting one edge into the other. You should feel the edges lock together.

For this step, it’s easiest to push the dryer into its final location to measure and then move it away from the wall so that you have room to work. Use the aviation snips to cut the last, unjoined straight duct section to the correct length; join the edges to close the pipe. Connect this section with the other sections before inserting the final elbow. Push the dryer back into its original position. Attach the ductwork to the dryer exhaust using another dryer vent clamp.

Use aluminum foil tape to seal all connection seams between the duct sections. If your duct runs up the side of a wall, cut a length of galvanized pipe hanger strap with aviation snips and wrap it over one of the sections. Secure the strap to the wall with screws appropriate to the type of wall material.

We know you did a great job. But for quality assurance purposes, turn on your dryer and allow it to run for a few minutes. Walk outside and check for a steady flow of hot air from the vent cap. If there is no hot air coming out of the vent, check your installation for loose connections. Remember to call the city to schedule a final inspection and close the permit. 

After several laundry loads, inspect your dryer vent again to ensure everything is in order. Remember to create a schedule for cleaning your dryer vent from time to time to keep it performing like new.