Smoke Odor Removal in Salt Lake County

Smoke odor is not in the air. It is in the residue smoke left on and inside the structure — a film of oily, acidic particles on every surface, pulled into wall cavities and the duct system while the house was hot. Every time the house warms up, that residue off-gasses again, which is why a home that smelled fine in March reeks when the furnace kicks on in October. Candles, ozone “bombs” from the hardware store, and a fresh coat of paint hide it for days. Removing it is a two-stage job.

Stage one: the soot comes off first

No deodorizer works on dirty surfaces. The biggest mistake Seth Saxton sees on smoke jobs is a company that fogs or sprays a house before the residue is actually removed — the smell drops for a week, then returns. We clean walls, ceilings, and trim with the chemistry matched to the residue type (contents are packed out to our contents-cleaning partner), and we clean the ductwork ourselves, because a furnace that ran during or after the fire has smoke on every inch of duct downstream. Full detail on that stage is on our soot cleanup page.

Stage two: gas-phase treatment reaches what cleaning can’t

Once the surfaces are clean, the structure is sealed and treated with either chlorine dioxide gas or ozone. Both are gases, so both penetrate wall cavities, duct runs, carpet pad, and the pores of unfinished wood — the places a rag never touches. They work differently: chlorine dioxide oxidizes odor molecules through a different pathway than ozone does, and we choose one per job based on the residue and the materials in the space, not on habit. Neither is a spray or a fog that lands on surfaces; the gas fills the volume of the room, which is why pricing is by cubic foot.

What a treatment looks like

The space is sealed — HVAC off, registers covered, doors taped — and treated with nobody inside; treatment can take 1 to 7 days, depending on whether any demo is needed. When treatment ends we ventilate the structure, and after an hour or two of airing out it is clear to re-enter. You do not need to leave the house for a week; you need to stay out of the treated zone while the gas is working.

What odor treatment costs

Chlorine dioxide treatment is $0.20 per cubic foot at 2026 rates for a space that doesn’t need demo; jobs that need demo or more invasive work are quoted after the walkthrough. As an example of the math at that rate, a 10,000-cubic-foot finished basement treated with chlorine dioxide is $2,000 and a 7,500-cubic-foot detached garage is $1,500. Ozone treatment, demo, and soot cleanup are quoted separately — soot in particular, because a lightly smoked room and a heavily smoked room of the same size are very different cleaning jobs. If it is a covered loss, we bill your carrier directly. Long-term cigarette smoke is not a covered loss.

Seth Saxton holds the IICRC OCT (Odor Control Technician) and FSRT (Fire and Smoke Restoration Technician) certifications, and Keystone Restoration is an IICRC Certified Firm (#70266523).