Almost everybody asks this, usually a day or two after the work, and often on behalf of someone else — a child, an elderly parent, a member of staff. It deserves a straight answer rather than a reassuring one.
How long the work itself takes
Most residential jobs are done in a day. Where contamination reached the subfloor, or more than one room is involved, two or three. Occasionally a floor has to come up before anyone can say for certain, and the honest position at the start is that nobody can give you a duration over the phone, because the spread is not visible until the work begins.
What you should get at the start is not a promise of hours but a clear account of how the assessment will run and what the range depends on.
When the room is safe to use
Once contaminated porous material has been removed, hard surfaces have been decontaminated and treated, and any treatment applied has been given its time to work, the room is safe to use again. In practice that is the same day the work finishes, or the following morning where a treatment needs to sit.
The crew should tell you a specific time, not “when it feels right”. If a room needs to stay closed for six hours, that is a sentence they can say.
What a company can honestly prove
This is where it is worth being careful about what you are told.
- It can show you what was removed. A written record of the materials taken out, the areas treated, and where the regulated waste went.
- It can show you the products used. Which disinfectants, applied for how long, on which surfaces.
- It cannot hand you a certificate that the room is sterile. No such thing exists for a home. Any company offering one is offering you a document it invented.
- It cannot prove a negative by smell. A room that smells of nothing has not been tested; it has been smelled.
The right question is not “is it certified safe”. It is “what did you remove, what did you treat, and what did you not touch”. A company that answers that plainly is telling you more than one that produces a badge.
If the smell comes back, the job is not finished
This is the clearest signal available to you, and it is worth knowing before you sign anything off. Odor is a symptom of residue that is still present somewhere — under boards, behind baseboard, in a cavity. A room that smelled fine for two weeks and smells again in warm weather has contaminated material still in it.
That is not bad luck and it is not something to live with. It means the source was not found, and it should be dealt with under the original job rather than as a new one. Our post on why the smell lingers goes into what actually removes it.
Children, pets and anyone vulnerable
- Keep them out until the crew says the room is finished, not until it looks finished. Looking finished happens some hours before it is.
- If a treatment has been applied, ask specifically when children and pets can be in the room. It is a different answer from when adults can.
- Anyone immunosuppressed, pregnant, or with a respiratory condition should be given a longer margin. Say who will be using the room and ask directly.
Going in for the first time
If the room is where someone you knew died, safety is not really what you are asking about, and it is worth separating the two questions. The room being safe does not mean you have to go into it today, and there is no schedule you are behind on.
Some people want to see it finished, and find that it helps. Others never use the room again and that is also a normal outcome. Neither needs justifying to anybody, including the company that did the work.
The work itself: Biohazard cleanup.
