Dryer vent maintenance is one of the easiest lines in a multifamily budget to forecast accurately, because unlike roofing or HVAC nothing about it is unpredictable. Unit count times per-unit rate. Here is how to build the line properly, and where the surprises actually come from.
The Base Calculation
Unit count × per-unit rate. For most properties the rate sits between $18 and $35, determined by termination type and access. Garden communities with wall caps sit low; high-rise properties with rooftop risers sit high. A 250-unit garden community budgeting $22 per unit forecasts $5,500.
Which Budget Line
Dryer vent cleaning is recurring maintenance, not component replacement — it belongs in R&M / operating expense, not capex or reserves. The exception is remediation: if inspection reveals duct replacement, non-compliant material replacement or termination replacement, that work may be capitalisable depending on scope and your accounting policy.
The First Clean Is Not the Steady State
A property that has never been cleaned carries years of compacted lint. Budget the first cycle at the top of your band and add a remediation contingency — typically 10-20% of the cleaning cost — for the deficiencies the first clean will surface. Crushed ducts, disconnected runs, foil transitions and failed dampers are found, not created, by the first clean.
Subsequent annual cycles run faster and cheaper. By the third cycle a property on an annual programme knows its steady-state number to within a few percent.
Annual or Biennial?
NFPA 211 requires inspection annually, and cleaning as necessary. Many garden properties in dry climates genuinely need cleaning only every 18-24 months. Humid-climate, heavy-usage and high-rise properties generally need annual cleaning.
The budget-efficient structure for lower-intensity properties: annual inspection (low cost, maintains compliance documentation), cleaning triggered by findings. This is cheaper than cleaning annually by default, and it is fully compliant — because the standard asks for annual inspection, not annual cleaning.
Multi-Year Forecasting
| Year | Activity | Cost Basis (250 units) |
|---|---|---|
| 1 | First clean + remediation contingency | $6,250 + $1,000 contingency |
| 2 | Inspection only (if findings allow) | ~$1,500 |
| 3 | Clean | $5,500 |
| 4 | Inspection only | ~$1,500 |
Illustrative — a humid-climate or high-rise property will clean every year and should budget accordingly.
Portfolio Budgeting
Management companies committing multiple properties see 10-15% below single-property rates, and gain something more valuable for budgeting: identical reporting across the portfolio, so year-over-year comparison across properties is actually meaningful.