Your house did not burn — but ash and smoke got in. Structural ash is not campfire ash, a broom is the wrong tool, and the insurance conversation is different. Here is how to handle it.
After the 2025 Palisades and Eaton fires, a large share of the calls we took came from homes that never saw flame. Ash on windowsills. A gray film on countertops. A smell in the closets that would not leave. Those homeowners had a real loss — it just did not look like one, and many of them started cleaning before anyone told them how.
Wildfire ash from burned structures is not the same material as ash from a fireplace, and treating it like ordinary dust is the most common and most consequential mistake made in the weeks after a fire.
Why structural ash is different
When a wildfire burns through a neighborhood, it does not just consume vegetation. It burns houses, and everything houses are made of — treated lumber, roofing material, insulation, wiring, appliances, electronics, paint, and household chemicals. California's public health agencies have consistently advised that ash from burned structures may contain toxic substances and can irritate the skin, eyes, nose, and throat, with elevated risk for children, older adults, and people with heart or lung conditions.
The particles are also extremely fine. Much of it is small enough to stay airborne for hours once disturbed and to reach deep into the lungs. That single fact drives every cleanup rule that follows.
The mistakes that make it worse
- Sweeping with a broom. This aerosolizes the exact particles you are trying to remove and redistributes them onto surfaces you already cleaned.
- Using a leaf blower outdoors. It sends settled ash back into the air and into any open window, and in many jurisdictions it was explicitly prohibited during post-fire cleanup periods.
- Vacuuming with a household or shop vacuum. Standard filtration passes fine ash straight through the exhaust and back into the room.
- Running the HVAC system. It pulls ash into ductwork and distributes it through the entire house, including rooms that were sealed.
- Dry-dusting. Same problem as sweeping, at a smaller scale, repeated across every surface.
- Skipping protection because the fire is out. Exposure risk during cleanup can exceed exposure during the fire itself.
How to do it correctly
AirNow, the interagency air-quality program, publishes practical guidance for after a fire: mist surfaces with water before sweeping to keep dust down, wet dusting cloths with water, use a HEPA-type vacuum, replace HVAC and air cleaner filters frequently, and wear a tight-fitting respirator marked NIOSH and N95 — cloth masks do not provide meaningful protection against ash.
- Ventilate only when outdoor air quality is good. Check current conditions before opening anything.
- Wear an N95 or P100 respirator, gloves, long sleeves, long pants, closed shoes, and eye protection.
- Keep children out of cleanup areas entirely, and keep pets away from ash — they track it in and then groom it off.
- Mist lightly, then wipe with damp cloths. Change cloths often rather than spreading residue.
- HEPA-vacuum carpets, upholstery, and drapes. Ordinary vacuums make the air worse.
- Replace HVAC filters with a high-MERV filter, and have ductwork evaluated before running the system normally.
- Bag debris and used cloths in double plastic bags and seal them.
- Wash exterior surfaces, walkways, and outdoor furniture with water rather than blowing them off.
The HVAC system is the part people forget
If your system ran at any point during or after the fire, ash is in the ducts. It will keep re-entering living space every cycle for months, which is why homes that were meticulously cleaned still smell faintly of smoke in October. Duct evaluation and cleaning, filter replacement, and coil cleaning are standard parts of a wildfire smoke scope for a reason — and the odor complaint that persists after everything else is done almost always traces back here. Our guide to removing smoke smell from a house covers why.
Insurance and smoke-only claims
Smoke and ash damage to a structure that did not burn is a legitimate covered loss under most homeowners policies, and it is routinely under-scoped. The difficulty is that the damage is not visually dramatic, so it is easy for an adjuster to write it as a cleaning line item when the actual scope includes duct cleaning, contents cleaning, insulation replacement, textile processing, and deodorization.
Documentation is what closes that gap: photographs, surface testing where warranted, an itemized inventory of affected contents, and a written scope from a restoration contractor. That work sits under property damage management, and it matters more on a smoke-only claim than on almost any other type.
When to stop and call someone
- Visible ash beyond a light film, or ash present in more than one or two rooms.
- Any odor in closets, fabrics, or bedding — that indicates penetration, not surface settling.
- Ash found inside HVAC vents or registers.
- Anyone in the household with asthma, COPD, heart disease, or immune compromise.
- Ash in the attic, which means it entered through vents and is sitting in insulation.
- Any structural damage, radiant heat damage to siding or windows, or fire-retardant residue on the exterior.
Our wildfire damage assistance covers assessment, containment, contents handling, HVAC decontamination, deodorization, and insurance documentation. We maintain dedicated response pages for Palisades and Altadena, and we serve homeowners across Los Angeles County and the four other counties in our service area.
Frequently asked questions
- Is wildfire ash in my house dangerous?
- Ash from burned structures can contain substances not present in vegetation ash, and the particles are fine enough to be inhaled deeply. Health agencies advise limiting exposure, using an N95 or better respirator during cleanup, and keeping children and people with heart or lung conditions away from ash. Light exposure to a thin film is not an emergency, but it is not something to sweep up in a t-shirt either.
- Can I clean wildfire ash myself?
- A light film in one or two rooms can be handled with proper PPE, damp wiping, and HEPA vacuuming. Beyond that — visible accumulation, multiple rooms, odor in fabrics, or ash in the HVAC system — professional cleaning is the better call, both because the scope exceeds household equipment and because the documentation supports your insurance claim.
- Does homeowners insurance cover smoke damage if my house didn't burn?
- Generally yes. Smoke and ash damage from a wildfire is typically a covered peril under standard policies even when the structure itself never ignited. The common issue is scope rather than coverage — carriers may initially treat it as routine cleaning, which is why an itemized professional scope is worth having before the adjuster's estimate is finalized.
- How long does wildfire smoke odor last indoors?
- Without remediation it can persist for many months, because the residue settles into insulation, textiles, and ductwork rather than dissipating. Odor that returns on hot days or when the HVAC runs is a reliable sign that residue remains in places surface cleaning did not reach.
Ash in the house after a nearby fire?
Gallagher Restoration Co. has responded to Southern California wildfire events for more than 15 years, including the 2025 Palisades and Eaton fires. Family-owned, IICRC-trained, CSLB #1061640, serving five counties from Canyon Lake. Call (951) 541-0034 for 24/7 dispatch, or request an assessment and we will document what is actually there before you clean anything.
