Is Your Facility Underestimating Its Confined Spaces?

A Common Misconception

Ask most safety managers what makes a confined space, and they will tell you: one way in, one way out. That is understandable, but it is not what OSHA says.

Under 29 CFR 1910.146, a confined space must meet three criteria:

• Large enough for an employee to bodily enter and perform work
• Has limited or restricted means of entry or exit
• Is not designed for continuous occupancy

Notice what is not in that definition: a single entrance. The operative phrase is "limited or restricted means of entry or exit." That covers a lot more ground than one door.

What "Limited or Restricted" Actually Means

According to OSHA's own compliance directive (CPL 2.100), the presence of a door does not automatically disqualify a space from being a confined space. What matters is whether an entrant's ability to escape in an emergency would be hindered.

That can include:

• A room with a single door where equipment, pipes, or obstructions would slow escape
• An access door that requires crawling or stooping to pass through
• A space with multiple entrances, if those entrances are difficult to navigate quickly
• Spaces where the distance to the exit or internal layout would interfere with rescue

If workers have to maneuver around equipment, duck under conduit, or squeeze through a narrow opening to get out fast, that is limited or restricted egress. Full stop.

Key point: A clean, wide door on a room full of tanks and piping may still qualify as a confined space. The exit itself is only one factor.

Why This Is Getting More Attention Now

OSHA updated its confined space regulations in 2025, introducing stricter documentation requirements for atmospheric testing, mandatory annual rescue drills, and expanded permit requirements. As organizations revisit their programs in response, many are taking a harder look at which spaces actually qualify.

The result: spaces that have been managed informally for years are now being correctly identified as permit-required confined spaces. In tank wash and maintenance environments, that process is overdue. Cleaning bays, chemical storage rooms, and wash pits with single-door access and poor ventilation may qualify and frequently go unclassified.

The Risk of Getting This Wrong

Misclassifying a space has real consequences. Workers enter without permits. Atmospheric testing does not happen. No attendant is designated. No rescue plan exists.

These are not hypothetical gaps. They are the exact conditions that precede confined space fatalities. OSHA data consistently shows that the majority of confined space deaths involve spaces that were either unrecognized or improperly managed.

The standard is unambiguous: if the space qualifies, it must be managed as a confined space. There is no "close enough."

What To Do

Start with a fresh space identification and classification audit. Walk every space in your facility with the legal definition in mind, not the informal one. Ask:

• Could a worker fully enter this space?
• Would anything slow their exit in an emergency?
• Is it designed for continuous occupancy?

If the answer to the first two is yes and the third is no, you have a confined space. From there, determine whether it is permit-required based on the hazards present.

Do this annually, and any time your facility layout changes, new equipment is installed, or operations shift. The space inventory is a living document, not a one-time checkbox.

The Bottom Line

Most facilities are not intentionally cutting corners on confined space classification. They are working from an incomplete understanding of what the definition actually covers. The good news: this is fixable, and a thorough space audit is the right place to start.

Proper identification is only the first step in a complete confined space program. Learn how controls, permits, and training work together here:
Confined Space Safety Controls, Permits, and Training Requirements

About the Author

Jim Tormey is the Chair of the NTTC Tank Wash and Maintenance Council's Confined Space Entry Subcommittee. This post was written in response to questions the subcommittee has received from member organizations navigating confined space classification and compliance. If you would like access to the CSE resources and best practice materials compiled through the subcommittee's work, reach out to Jim directly at jtormey@sentryroad.com.

Reference: OSHA 29 CFR 1910.146 | CPL 2.100 | osha.gov/confined-spaces