Confined spaces – such as manholes, crawl spaces, and tanks – are not designed for continuous
occupancy and are difficult to exit in the event of an emergency. People working in confined
spaces face life-threatening hazards including toxic substances, electrocutions, explosions, and

This webpage contains information on the new regulation, compliance assistance documents, and
other resources OSHA has to help employers and workers understand the rule. OSHA will
continue to publish new guidance products in the coming months and will post them here. Please
check the website often for updates.

Construction workers often perform tasks in confined spaces – work areas that (1) are large
enough for an employee to enter, (2) have limited means of entry or exit, and (3) are not
designed for continuous occupancy. These spaces can present physical and atmospheric hazards
that can be prevented if addressed prior to entering the space to perform work. This page is a
starting point for finding information about these spaces, the hazards they may present, and ways
to safely work in them.

29 CFR 1926.1200 Subpart AA

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