A couple weeks ago a resident cleaned their close dryer vent. They were shocked to see that the lint almost filled two five-gallon buckets!
This was a Centex (Vinyl siding) home with a single-car garage. In this style the dryer vent is routed thru the attic and out the roof.
We strongly recommend that you have your dryer vents cleaned no matter what style home you have.
A clogged dryer vent can be a fire hazard!