Dryer vent replacement: cost, when to replace, what to use

Updated October 12, 2026 · Every figure checked twice against its source · How we verify

Dryer vent replacement costs $100 to $300 on average, according to HomeGuide: $30 to $100 for the duct and materials and $70 to $200 for labor, with the new ductwork placed where the old vent was and no walls cut. HomeGuide says professionals can replace a pre-existing dryer vent in one hour in most cases. If the old vent is plastic or foil, Whirlpool's installation instructions say to replace it with rigid or flexible heavy metal vent.

Dryer vent replacement cost

HomeGuide puts HVAC labor at $75 to $150 per hour and handyman prices at $50 to $80 per hour for simple jobs, and says longer ducts and more durable materials, such as rigid stainless steel, cost more. A new vent through an exterior wall where none existed is a different job: HomeGuide prices it at $200 to $800, and our dryer vent installation guide covers it. For a section that only needs fixing, Fixr puts a broken dryer vent repair at $75 to $150; see dryer vent repair.

Dryer duct replacement: the three parts of a vent

The 2021 International Residential Code sets separate rules for the transition duct, the exhaust duct and the termination, where the code is adopted.

When to replace dryer vent hose

The code and the dryer makers' instructions cited here set no age limit for a vent. They name conditions instead:

• It is plastic or foil. The U.S. Fire Administration recommends replacing coiled-wire foil or plastic venting with rigid, non-ribbed metal duct. Its 2012 report says all manufacturers now state in their manuals not to use plastic, flexible dryer ducts, that the plastic itself can provide additional fuel for a fire, and that flexible vents can twist, allowing lint to build up.
• It is damaged, crushed or restricted. The USFA says to check the venting system behind the dryer for exactly that. LG's owner's manual says not to crush or collapse ductwork and not to let it rest on or contact sharp objects.
• The dryer shows an airflow code. Whirlpool says an "AF" code on models with airflow detection means you may have a blocked or partially blocked vent or a vent system that is too long, and its first check is whether the vent run from the dryer to the wall is crushed.
• The hose is too long or inside a wall. The 2021 IRC limits the transition duct to 8 feet and bars concealing it within construction (M1502.4.3). Whirlpool's instructions say the total length of flexible metal vent should not exceed 7¾ feet, and not to install it in enclosed walls, ceilings or floors.
• A new dryer is going in. Whirlpool's instructions for an existing vent system: clean lint from the entire length, make sure the exhaust hood is not plugged, replace any plastic or metal foil vent, and modify the system if needed to achieve the best drying performance. LG says to make sure existing ductwork is suitable and clean before installing the dryer.

Slow drying points to the vent, not always to a replacement. Whirlpool says complaints of long drying times or a hot dryer top indicate the need for inspection of the exhaust system, and the USFA says that when heavy clothes such as blue jeans or towels take a long time to dry, a clogged dryer vent exhaust is likely the problem. Whirlpool's inspection steps for an intact duct are to remove the lint, reassemble it and check for leaks: see dryer vent cleaning.

What type of dryer vent hose is best?

Metal, 4 inches across. The 2021 IRC requires a metal exhaust duct 4 inches in diameter, and Whirlpool and LG both specify 4-inch metal and say not to use plastic. The two makers differ slightly on flexible metal.

Whirlpool says flexible venting materials are known to collapse, be easily crushed and trap lint, and that it does not approve anything other than rigid metal or flexible metal duct in a 4-inch diameter. Whirlpool adds that increasing the size beyond 4 inches lowers the air speed inside the pipe, which reduces its ability to keep lint moving.

Two maker documents disagree on tape. Whirlpool's electric dryer installation instructions (W10267633A) say to use clamps to seal all joints and not to use duct tape; LG's owner's manual (DL*X400** / DL*X408**) says to secure all joints with duct tape. Where the 2021 IRC is adopted, exhaust duct joints must be sealed in accordance with Section M1601.4.1 and mechanically fastened (M1502.4.2). More detail on foil, PVC and screws is in dryer vent materials and size.

How to replace dryer vent hose

No maker's document we read gives a replacement procedure, so these steps are put together from Whirlpool's inspection and installation steps and the code rules.

1. Pull the dryer out with help. Whirlpool's installation instructions say to use two or more people to move a dryer. On a gas dryer, the NFPA says a qualified professional should inspect the gas line and connection to make sure they are intact and free of leaks.
2. Disconnect the old hose from the dryer and the duct. Whirlpool's inspection steps begin by disconnecting the exhaust duct from the dryer.
3. Clean the duct you are connecting to. Whirlpool says to make sure an existing vent is clean before connecting; LG says to clean any old ducts before installing the dryer.
4. Fit a listed metal transition duct: one length, listed and labeled to UL 2158A, 8 feet or less, not concealed within construction (IRC M1502.4.3). Whirlpool says to remove excess flexible vent to avoid sagging and kinking.
5. Clamp both ends. Whirlpool's step: using a 4-inch clamp, connect the vent to the dryer's exhaust outlet; the vent fits over the outlet. Whirlpool says not to use screws or other fasteners that extend into the vent, which can catch lint, and LG says the male end of each duct section must point away from the dryer.
6. Move the dryer into place without crushing or kinking the vent (Whirlpool, LG).
7. Run the dryer and check. Whirlpool says to verify that the exhaust air is not obstructed and that there are no leaks, and to seal any leaks found. The USFA says to make sure the outdoor vent covering opens when the dryer is operating.

How to replace an outside dryer vent

Pick the hood first. Whirlpool recommends a louvered or box hood and calls an angled hood acceptable; on one of its electric dryers, an angled hood cuts the allowed rigid run with no elbows from 64 feet to 58 feet. Whirlpool says the hood must be at least 12 inches from the ground or any object in the path of the exhaust, and not to use a hood with a magnetic latch. LG says the hood should have hinged dampers to prevent backdraft. Under the 2021 IRC, the termination needs a backdraft damper and no screen, and unless the dryer maker's instructions set the location, it must be at least 3 feet in any direction from openings into the building (M1502.3).

The steps below are Whirlpool's steps for installing a hood; no source we read covers taking an old one off.

1. Install the exhaust hood and seal the exterior wall opening around it with caulking compound (Whirlpool). HomeGuide says most vent covers attach directly to the vent pipe with caulking around the rim.
2. Connect the vent to the hood. Whirlpool says the vent must fit inside the exhaust hood and be secured with a 4-inch clamp.
3. Check the flapper. Whirlpool says lint may collect in the hood so the flappers or louvers will not open or close completely; after cleaning the hood, check that they move freely.
4. Run the dryer and verify the exhaust air is not obstructed and there are no leaks (Whirlpool).

HomeGuide puts the cost to replace a dryer vent cover at $50 to $100, and $5 to $10 for the cover alone. Hood types and bird guards are compared in dryer vent cover rules.

Check the run length before you replace it

A replacement is the time to confirm the run is not too long. The 2021 IRC sets 35 feet from the transition duct to the outlet, minus an allowance for each fitting (a 4-inch radius mitered 90-degree elbow counts as 5 feet), or lets the dryer maker's installation instructions set the length (M1502.4.6).

The makers' limits are model-specific. Whirlpool's electric dryer instructions (W10267633A) allow 64 feet of rigid metal with no 90-degree elbows and 35 feet with three, with box or louvered hoods. LG's owner's manual for its DL*X400 and DL*X408 dryers lists 65 feet with no elbows and 36 feet with three, with its recommended wall cap. The 2021 IRC prohibits domestic booster fans in dryer exhaust systems (M1502.4.5).

Who replaces dryer vents?

HomeGuide says HVAC technicians, plumbers and appliance technicians install dryer vents, and suggests getting quotes from at least three companies. The credentials it lists are the Chimney Safety Institute of America's Certified Dryer Exhaust Technician (C-DET), National Air Duct Cleaners Association (NADCA) certification and a general contractor's license. The USFA and the NFPA both say to have your dryer installed and serviced by a professional.

If the duct is metal and intact, cleaning is the other option: HomeGuide prices dryer vent cleaning at $80 to $185; see dryer vent cleaning cost. For a replacement, use the form below and we will send your request to a company that serves your ZIP code.

Sources

1. HomeGuide, dryer vent installation cost, page dated January 5, 2026: homeguide.com
2. Fixr, dryer vent cleaning cost, updated January 31, 2025: fixr.com
3. International Code Council, 2021 International Residential Code, section M1502: codes.iccsafe.org
4. Whirlpool, "Dryer venting specifications" (W11688180A): whirlpool.com
5. Whirlpool, "Electric dryer installation instructions" (W10267633A): whirlpool.com
6. LG, Owner's Manual, DL*X400** / DL*X408**, "Venting the Dryer": gscs-manual.lge.com
7. U.S. Fire Administration, "Clothes Dryer Fires in Residential Buildings (2008 to 2010)", August 2012: usfa.fema.gov
8. U.S. Fire Administration, "Clothes Dryer Fire Safety" flyer: usfa.fema.gov
9. NFPA, "Clothes dryer safety" tip sheet, 2018: nfpa.org

All sources read October 12, 2026.