Decomposition Cleanup

Decomposition releases fluids and gases that penetrate materials and keep releasing odor long after the visible source is gone. Effective remediation means following the material as far as it actually travelled — often through flooring into subfloor and joists — and treating the structure itself rather than the surface above it.

The same work applies whether the source was human or animal. A dead animal in a wall cavity, under a floor or in a crawlspace produces the same compounds in smaller volume, and the same rule holds: the smell persists until the material is removed, not until the area is cleaned.

When to call

Any of the following means the property needs a professional assessment rather than a decision made on your own:

• A persistent odor has developed and the source cannot be located
• A death was discovered after some days and the property has not been assessed
• A previous cleanup was carried out and the smell has returned
• Flooring has discoloured, softened or stained from below
• An animal has died inside a wall, floor void or crawlspace
• A property is being prepared for sale or letting and an odor remains

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How the work is done

1. Locating the full extent of penetration, including under flooring

   Locating the full extent of penetration, including lifting flooring where the underside is the only place the true spread shows.

2. Removal of affected material back to sound substrate

   Containment and negative air so that disturbing the material does not push odor through the rest of the building.

3. Enzymatic and antimicrobial treatment of the structure

   Removal of affected material back to sound substrate — the point at which cleaning stops working and removal starts.

4. Air scrubbing and hydroxyl treatment for odor

   Enzymatic treatment to break the compounds down chemically, followed by antimicrobial treatment of exposed structure.

5. Sealing and, where needed, coordination of repairs

   Sustained hydroxyl generation and air scrubbing to oxidise remaining airborne compounds at source.

What is included

Why this is not a job to take on yourself

People ask, and it is a fair question — in most places nothing legally stops a property owner doing this work. These are the reasons it is generally a poor idea:

• The material carries bacterial loads that increase the longer it is left, alongside ordinary bloodborne pathogen risk
• Masking agents and ozone machines used alone leave the source in place and the smell returns
• Cutting into flooring without establishing what is beneath can spread contamination to a clean space below
• Absorbed odor compounds transfer readily to clothing, hair and soft furnishings

The rules that govern this work

Standard biohazard rules apply: OSHA bloodborne pathogen protection for the crew, state medical waste definitions for disposal, and transport regulation for moving regulated material. Decomposition-affected porous material is regulated waste in most states under the saturation test.

Where the property is rented or is being sold, the disposal manifests and written scope are the documents that demonstrate the source was removed rather than covered.

How long it takes

One to three days for most residential jobs, though odor treatment frequently extends this. Hydroxyl treatment needs to run for a sustained period and cannot be shortened without risking the smell returning.

The strongest predictor of scope is how long the property was affected. Every additional day allows deeper penetration and converts more of the job from cleaning to removal.

Insurance and paying for it

Frequently covered where the decomposition followed a sudden event such as a death. Coverage is less likely where an odor developed gradually from an unnoticed animal, though some policies treat it as sudden and accidental damage.

Photograph before work starts and retain the scope and manifests, which are what an adjuster asks for.

What to do before the crew arrives

• Close off the affected area and keep the door shut
• Turn off heating and air conditioning so the system stops moving odor around
• Avoid airing the property aggressively, which can pull odor into clean rooms
• Keep pets away — animals are drawn to the source
• Do not apply air fresheners or masking products, which complicate assessment
• Note when the odor was first noticed, which helps estimate penetration

Who calls us for this

The situation looks different depending on who is dealing with it, and so does what matters most about the work.

What happens once the work is finished

• Confirmation that odor has been eliminated at source rather than covered
• A written record of where material was found and how far it had travelled
• Disposal manifests for all regulated waste
• Photographs of the affected area before, during and after removal
• A reconstruction quote where flooring or structure was removed
• Advice on what to monitor over the following weeks as the property settles

Mistakes worth avoiding

These come up repeatedly, and every one of them makes the eventual job harder or more expensive than it needed to be.

• Using ozone generators alone. Ozone oxidises airborne compounds but cannot reach material absorbed inside flooring or drywall, and at effective concentrations the space cannot be occupied.
• Painting or sealing over an untreated surface. The smell returns through the coating, usually within weeks and usually in warm weather.
• Applying air fresheners before assessment. Masking agents make locating the source harder and the combination is frequently worse than the original odor.
• Assuming the smell is drains or damp. Decomposition odor is distinctive, and misdiagnosing it wastes weeks while penetration continues.
• Cutting into flooring without knowing what is beneath. This can drop contamination into a clean space below.

Discretion

Crews attend in unmarked vehicles and plain clothing wherever possible. There is no signage, no branding on protective equipment visible from the street, and no reason for a neighbour to know what the work is. Discretion is part of the service rather than something extra to ask for, and it is the thing most people are quietly worried about when they call.

Common questions

Related reading

• How Long Does It Take for a Body to Decompose?
• The Stages of Human Decomposition
• What Does a Decomposing Body Smell Like?

Other services

• Crime Scene Cleanup
• Biohazard Cleanup
• Unattended Death Cleanup
• Suicide Cleanup
• Hoarding Cleanup