Dryer Vent Installation — Costs, Materials & How-To (2026)

For a standard residential dryer vent installation you will need: 4-inch rigid aluminum or galvanized steel duct sections (sold in 2-foot and 4-foot lengths); 4-inch elbows (90-degree and 45-degree as needed); a 4-inch exterior vent cap with backdraft damper; semi-rigid aluminum transition duct for the section behind the dryer (4 to 6 feet); hose clamps or sheet metal screws to secure connections; aluminum foil HVAC tape (not standard duct tape) to seal all joints; a 4-inch hole saw for cutting through the exterior wall; and a drill. For walls with fire-blocking between floors, you may also need fire-rated duct wrap.

Per the International Residential Code (IRC), dryer vent installations must: use smooth-wall metal duct with a minimum thickness of 0.016 inches for any concealed (in-wall) run; maintain a minimum duct diameter of 4 inches; not exceed 35 equivalent feet of total duct length (subtract 5 feet per 90-degree elbow, 2.5 feet per 45-degree elbow); terminate to the building exterior with a full-opening backdraft damper vent cap; be at least 12 inches above the finished exterior grade; not share a duct with any other appliance; use joints fastened with sheet metal screws — fasteners must not protrude into the duct interior (no screws that would catch lint). Concealed duct sections must not use flexible duct of any type.

Step 1: Plan the route — identify the shortest path from the dryer location to an exterior wall, minimizing bends. Sketch the route and calculate equivalent length to ensure it stays under 35 feet. Step 2: Cut the exterior wall penetration — mark the 4-inch hole location on the interior wall, drill a pilot hole through to the exterior, then use a 4-inch hole saw to complete the penetration from outside. Step 3: Install the exterior vent cap — insert the vent cap into the hole from outside, ensuring the flap faces downward or outward. Seal the exterior gap with weatherproof caulk. Step 4: Run the rigid duct — working from the exterior cap inward, connect rigid duct sections with crimped ends pointing in the direction of airflow, secure each joint with sheet metal screws, and seal with foil tape. Step 5: Connect the transition duct — attach semi-rigid aluminum flex from the wall duct inlet to the dryer's exhaust port using hose clamps. Step 6: Test — run the dryer on high heat and verify strong airflow at the exterior cap.

New dryer vent installation through an exterior wall costs $200–$800, depending on wall type, duct length, and whether the vent exits through the side or roof. The cost breakdown: materials (rigid duct, elbows, vent cap, transition duct, hardware) typically run $50–$150; labor at $75–$150 per hour for an HVAC contractor or $50–$80 per hour for a handyman. A Reddit user in Little Rock, AR reported $135 in materials and $300 in labor (3 hours at $100/hr) for a complete installation. Replacement of existing ductwork in the same location costs $100–$300 since no wall penetration is required.

If your existing vent is in an acceptable location but the ductwork is damaged, blocked, or made of prohibited materials, replacement costs significantly less than a full new installation. Replacement involves removing the old duct and installing new rigid metal duct through the existing wall penetration and duct route — a $100–$300 job for most homes. Full new installation requires cutting a new wall penetration and running all-new ductwork, which adds $100–$500 in labor depending on wall construction (wood-frame vs. brick or concrete) and route length.

Most dryer vent installation problems stem from a few avoidable mistakes: using plastic or vinyl flexible duct (flammable and code-prohibited); using standard duct tape instead of foil HVAC tape (standard tape dries out and falls off over time, creating air leaks); screws penetrating into the duct interior (they catch lint and cause clogs); too many bends exceeding the 35-foot equivalent length limit; terminating the duct into an attic, crawl space, or garage instead of the exterior; and failing to seal the exterior wall penetration with weatherproof caulk (allowing water intrusion and pest entry).