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Air monitoring and the clearance certificate

The end of an asbestos job is not when the truck leaves. It is when an independent assessor says the area is fit to reoccupy, in writing.

The paperwork that lets you move back in

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Asbestos removal finishes with two things that are easy to skip and expensive to have skipped: air monitoring and a clearance certificate.

Air monitoring measures the concentration of respirable fibres in the air during and after the work, sampled onto filters and counted under a microscope. For friable (Class A) work it is mandatory and must be carried out by a licensed asbestos assessor who is independent of the removalist — the person checking cannot be the person being checked. For bonded work it is not always required, but it is often worth having anyway when the job was indoors or close to neighbours.

The clearance certificate is the document that says the area has been visually inspected, found free of visible debris and dust, and — where monitoring applies — that fibre levels are below the clearance criterion. It is what allows reoccupation, and it is the piece of paper you should hold on to: it matters when you sell, when a tenant asks, and when the next tradesperson works in that space.

There is also a plainer reason to insist on it. The commonest way a household ends up with contamination is not the removal itself, it is an incomplete clean-up — dust in the roof space, fragments in the garden bed, debris left in gutters. A proper decontamination and clearance is the step that catches exactly that.

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Clearance guides

Sources

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