The assumption that a five-year-old building has clean vents is one of the most reliable errors in multifamily maintenance. New construction produces a specific set of vent problems that have nothing to do with lint — and they are present from day one.
What We Find in Newer Properties
Construction debris. Drywall dust, insulation fragments, sawdust and packaging inside duct runs. Ducts are installed early in the build and sit open through months of interior work. Unless they were sealed and later cleared — and they usually were not — that material is still there.
Disconnected runs. Duct sections that were never properly joined, or that separated during subsequent trades’ work. The unit’s dryer vents into a wall cavity or ceiling void. Residents report nothing because their dryer appears to work.
Crushed sections. Ducts installed before framing was complete and subsequently damaged. A crushed elbow behind drywall is invisible and permanent unless someone measures airflow.
Non-compliant materials. Foil flex duct in concealed spaces, which most codes prohibit. It happens in new construction more often than owners expect, particularly where subcontractors substituted materials.
Protruding screws at joints. Every screw into the airstream is a permanent lint snag, guaranteeing accelerated blockage from the first year.
The Warranty Window Matters
Most of these are construction defects, not maintenance items. Identifying them within the warranty or latent defect window means the builder fixes them. Identifying them at year eight means the owner does.
This is the strongest argument for inspecting new properties early: not because they are dirty, but because what is wrong with them is somebody else’s cost to fix — for a limited time.
The Lease-Up Reality
Nobody inspects vents during lease-up. The property is chasing occupancy, the maintenance team is drowning in punch items, and dryer vents are the last thing on anyone’s list. Two years later the building is stabilised, the warranty is closing, and the vent defects are now owned.
What an Early Inspection Costs and Saves
A vent inspection on a new property is a fraction of a cleaning cost — airflow measurement across the property, termination assessment, and identification of disconnected or restricted units. The output is a punch list. Units with restricted airflow in a two-year-old building do not have a lint problem; they have a construction problem, and the report is what you take to the builder.
The Recommendation
Inspect within the first two years of occupancy, while warranty remedies remain available. Then clean on a normal cycle from year three onwards, once actual lint accumulation begins to matter.