A dryer pushes warm, damp, lint-laden air through a duct to the outside. Most of the lint stays in the trap; some does not, and it settles along the duct, at each bend and behind the flap of the outside hood. There is no single interval that suits every home. The right one depends on how long the run is, where it exits and how much laundry goes through it, and the dryer itself usually tells you when it is due.
Signs the vent needs attention now
These signs are worth acting on whatever the calendar says. The first two are the most common and the easiest to notice.
| Sign | What is usually happening | What to do |
|---|---|---|
| A normal load needs a second cycle | Airflow restricted somewhere along the run | Clean the full duct, not just the trap |
| The dryer or laundry room gets unusually hot | Hot air cannot leave fast enough | Stop and have the run checked |
| Lint around the outside hood or on the flap | Flap sticking, lint escaping at the exit | Clean the hood and the last section |
| Little or no airflow at the outside hood while running | Blockage or a crushed duct | Inspect the full length |
| A burning or musty smell during a cycle | Lint near heat, or moisture trapped in the duct | Stop using the dryer until checked |
What makes some runs clog faster
Length and bends matter most. A short, straight run through the wall behind a ground-floor laundry clears itself well; a long run with several elbows, or one that climbs to a roof exit from an upstairs laundry, gives lint more places to settle. Flexible foil or plastic transition hose, which sags and ribs inside, traps more than smooth rigid duct.
Local conditions add to it. A hood that exits into a damp side yard or under shrubs stays wet much of our long rainy season, and damp lint sticks to the flap and the last few feet of duct. Vents that exit on a roof also collect moss and debris on the hood.
Setting your own interval
Your dryer's manual gives the manufacturer's recommendation for your model; start there. Then adjust with the table below: a large household, a long or roof-exit run, or a flexible transition hose all argue for a shorter interval, while a short, straight run used lightly can go longer.
Condos and townhouses deserve a special note. Bellevue has a large multifamily stock, 31,860 of its 64,688 housing units per Washington OFM, and in many of those buildings the dryer duct runs through shared walls or ceilings to an exit you cannot see. Ask your building manager where it ends and who cleans it.
| Your setup | Lean toward |
|---|---|
| Short, straight run through a ground-floor wall | The manufacturer's interval |
| Long run, several elbows, or a roof exit | A shorter interval |
| Large household, dryer running most days | A shorter interval |
| Flexible foil or plastic transition hose | Replacing it, then a shorter interval |
Moving or rerouting a vent
Relocating a laundry often means a new vent route, and that can be permit work. Clyde Hill, for example, lists fans and vents among the items that need a mechanical permit, and Issaquah requires a permit before a mechanical system is installed or altered. Ask the city before the new duct goes in.
What it runs
Our dryer vent cleaning is priced from $105 to $295; a long run, a roof exit or a nest in the hood puts a job at the top. For comparison, StarDucts publishes a typical Seattle range of $125 to $225, Mad Hatter Chimney Sweep lists $89 to $149 as an add-on to a chimney visit, and Fixr's national range is $100 to $200. Those three are other companies' numbers, not ours.
Frequently asked questions
How do I know if my dryer vent is clogged?
Loads that need a second cycle, a dryer or laundry room that runs hot, lint around the outside hood, or weak airflow at the hood while the dryer runs.
Is cleaning the lint trap enough?
No. The trap catches most lint, but some passes it and settles along the duct and behind the outside flap, which the trap never reaches.
Can a dryer vent go through the roof?
Yes, and many upstairs laundries vent that way. A roof exit is usually longer and harder to reach, so it tends to need cleaning more often.
Who cleans the dryer vent in a condo?
It depends on the building. Many ducts run through shared walls to a common exit; ask the building manager where yours ends and who maintains it.
Sources
- StarDucts — Dryer vent cleaning cost in Seattle — accessed September 23, 2026
- Mad Hatter Chimney Sweep — Sweep Cost Seattle — accessed September 23, 2026
- Fixr — Dryer vent cleaning cost — accessed September 23, 2026
- Washington OFM — Housing unit estimates — accessed September 23, 2026
- City of Clyde Hill — Mechanical Permit — accessed September 23, 2026
- City of Issaquah — Do I Need a Permit? — accessed September 23, 2026
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