Chimney Cleaning Cost Calculator
A cleaning costs what the buildup makes it cost. Start from your base rate, pick how dirty the flue is, and see the number move — a lightly used chimney cleans fast, a glazed one drags.
1 Enter your numbers
Cleaning cost tracks how much soot and creosote there is — a lightly used flue cleans fast, a heavily glazed one takes longer. At Moderate buildup (×1.25) this is about $261. The multipliers are labeled planning typicals you can adjust.
The word “cleaning” hides a two-to-one price range, because the work is set by what is stuck to the flue, not by the flue itself. A chimney lit a handful of evenings a winter carries a thin, powdery soot that a rotary brush clears in one pass. A daily-burned stove — especially one fed unseasoned wood or damped down for long smoky smolders — glazes the flue with hard buildup that takes more passes, more time and sometimes a different tool. This calculator models that with a plain condition multiplier you can override: light leaves the base rate alone, moderate lifts it about a quarter, heavy about half. The condition itself is the sweep’s call once the camera is up the flue — you are pricing the scenarios, not diagnosing the chimney.
Formula
total = (base rate × condition multiplier + trip / access) × (1 + contingency)
Condition multipliers are LABELED planning typicals: light 1.00×, moderate 1.25×, heavy 1.50× — adjust them to match what your sweep quotes.
Worked example
Take a wood-burner used most nights: base rate $155, the sweep flags it heavy (1.50×), a $48 access fee, 10% cushion:
(155 × 1.50 + 48) × 1.10 = (232.50 + 48) × 1.10 = 280.50 × 1.10 = $309
Drop the same flue to light and it is (155 + 48) × 1.10 ≈ $223 — the buildup, not the chimney, is the $86 difference.
Before you book: what “dirty” really means
- Powder vs glaze. Dry, black powder is light-to-moderate. Shiny, tar-like glaze is Stage 3 creosote — brushing barely marks it. Price that as creosote removal, not a cleaning.
- Burn habits set the buildup. Seasoned wood, hot fires and an insulated liner keep a flue clean; wet wood and long damped-down smolders coat it fast.
- Gas is not exempt. A gas fireplace still needs the flue and vent checked for debris, nests and corrosion — less soot, same look-over.
- One visit, two flues. If the furnace shares the chimney, expect a second, usually discounted, line rather than a doubled base rate.
Reference table
Labeled planning multipliers — adjust to your sweep’s quote. The condition is judged with a light or camera up the flue.
| Flue condition | Cost multiplier |
|---|---|
| Light use | 1.00× |
| Moderate buildup | 1.25× |
| Heavy / glazed | 1.50× |