The Confined Space Standards: Which One Applies, and Who Owes What
Most confined space content explains what a confined space is and what equipment goes in it. That is the easy half, and it is covered on our confined space equipment page.
This page covers the half that actually decides citations on a multi-employer job site: which of the two federal standards you are under, and which of the three defined employer roles you are holding. Those two questions determine who evaluates the site, who issues the permit, who posts the sign, who talks to whom before entry, and who has to debrief afterward. On a job with an owner, a general contractor and two subcontractors, all four parties usually assume one of the others owns all of it.
Every answer below cites the section it comes from, verified against the regulation text and OSHA's published guidance on 20 August 2026.
Two standards, and the test that picks between them
29 CFR 1910.146 covers general industry. 29 CFR 1926 Subpart AA covers construction. They are not interchangeable and they do not cover the same duties.
The test is the nature of the work, not the space and not the building. OSHA states it plainly: if you are doing construction work, such as building a new structure or upgrading an old one, you follow the construction rule. 29 CFR 1926.32(g) defines construction work as work for construction, alteration, and/or repair, including painting and decorating.
Where this bites is maintenance. Adjusting existing equipment and replacing component parts in kind is maintenance, which sits under general industry. Upgrading the equipment is construction. Same technician, same vessel, same hatch, different standard. That line is worked through with a concrete example on our HVAC contractor page.
Three roles, and why nobody on site knows which one they are
Subpart AA builds the whole multi-employer scheme on three defined roles. One company can hold more than one of them, and on a small job frequently does.
- Host employer. The employer that owns or manages the property where the work takes place.
- Controlling contractor. The employer that has overall responsibility for construction at the worksite.
- Entry employer. The employer who decides that an employee it directs will enter a permit space.
The information has to move in a specific direction, and 29 CFR 1926.1203(h) sets it out:
- Before entry begins, the host gives the controlling contractor the location of each known permit space, the hazards or reasons it is a permit space, and any precautions a previous occupant or contractor put in place.
- The controlling contractor passes all of that, plus anything else it knows, to each entry employer.
- Each entry employer tells the controlling contractor what permit space program it will follow and what hazards it confronted or created in the space.
- The controlling contractor coordinates when more than one entity works in or near the same space at the same time, and debriefs each entity afterward.
If there is no controlling contractor on site, 29 CFR 1926.1203(i) moves those duties to the host employer or to whoever arranged for the work to be performed. On an owner-directed job with no general contractor, that is the owner, whether or not the owner knows it.
The step that is almost never performed is the fourth one. The post-entry debrief is a written requirement in the standard, not a courtesy, and it is the mechanism by which the next contractor into that space finds out what the last one found.
Deciding not to enter is a decision that creates duties
Employers routinely assume that if their people are not going into the space, the standard is somebody else's problem. It is not. Three duties attach regardless of whether anyone enters.
- Evaluate. 29 CFR 1926.1203(a) requires a competent person employed by each employer to identify the confined spaces where the employees it directs may work, and determine which are permit spaces. You do not inherit somebody else's evaluation.
- Prevent entry. 29 CFR 1926.1203(c) requires effective measures to keep your employees out of a permit space you have decided not to enter. A verbal instruction is not an effective measure.
- Inform. 29 CFR 1926.1203(b)(1) requires exposed employees to be told the existence, location and danger of each permit space, by danger sign or equally effective means.
The written permit space program is the requirement that does turn on entry. If workers will enter permit spaces, you need one. If they will not, you still owe the three above.
What we do with this
Everything on this page is a program question rather than an equipment question, which is why it is here rather than on the product page. We write confined space entry programs, run the site evaluations that 1926.1203(a) requires, sort out who holds which role on a multi-employer job before anyone opens a hatch, and train entrants, attendants and entry supervisors.
Consulting covers the written program and the evaluations. Training is delivered nationwide. Fractional EHS is the option for a company that needs someone owning this month to month. Equipment, including tripods, winches, retrieval lifelines and gas detection, is on the confined space collection, and the tripod and multi-gas detector are both on the rental fleet.
How the federal standards interact with a state that runs its own OSHA program is covered on our federal OSHA and state plans page.
Multi-employer confined space questions, answered
How do I know whether to follow the general industry or the construction confined space rule?
By the nature of the work, not the building and not the space. 29 CFR 1910.146 covers general industry. 29 CFR 1926 Subpart AA covers construction. OSHA's own test is direct: if you are doing construction work, such as building a new structure or upgrading an old one, you follow the construction confined space rule. 1926.32(g) defines construction work as work for construction, alteration, and/or repair, including painting and decorating. Maintenance, meaning adjusting existing equipment and replacing parts in kind, sits under general industry. The two rules have different program requirements, so this is not an academic distinction.
Who has to evaluate the site for confined spaces?
A competent person employed by each employer, under 29 CFR 1926.1203(a). Before work begins, each employer must have a competent person identify all confined spaces where employees it directs may work, and determine which of those are permit-required spaces. The evaluation includes consideration and evaluation of the elements of the space, including testing as necessary. Note the wording: each employer. A subcontractor does not inherit the general contractor's evaluation and skip its own.
Can OSHA cite us for not documenting the initial evaluation?
Not for the documentation itself. The standard requires no written record of the initial evaluation, and OSHA has said so. But you must be able to explain how the evaluation was conducted and describe the results, and a citation will issue for failing to evaluate. In practice that means an undocumented evaluation is defended by a person's memory in front of a compliance officer. Most employers who understand that choose to write it down anyway.
Who is the host employer, the controlling contractor and the entry employer?
Three defined roles under 29 CFR 1926 Subpart AA, and one company can hold more than one. The host employer owns or manages the property where the work happens. The controlling contractor has overall responsibility for construction at the site. The entry employer is the employer who decides that an employee it directs will enter a permit space. Most multi-employer confined space failures trace to nobody on site knowing which of the three they are.
Which employer issues the entry permit?
The entry employer. Under the construction standard the entry employer is the one who decides that an employee it directs will enter a permit space, and that employer issues the permit. A general contractor cannot issue a permit on a subcontractor's behalf and thereby take the duty off them, and a subcontractor cannot rely on a permit somebody else wrote.
Is the entry permit required to be posted?
No. Posting is not required. The permit must be made available to authorized entrants or their representatives at the time of entry, which can be done by posting it at the entrance or by any other equally effective means. The duty is availability, not display, so a permit in a supervisor's truck three hundred yards away does not satisfy it even though a taped-up copy would.
If I hire a contractor to work in a confined space, do I have any responsibilities?
Yes. Under 29 CFR 1926.1203(h), controlling contractors and host employers must discuss the spaces on the site and their hazards with entry employers and with each other, both before and after entry. Hiring the work out does not move the duty. This is the single most commonly missed obligation in confined space work, because the general contractor assumes the specialty sub owns it entirely and the sub assumes the site information it was given is complete.
What must the host employer give the controlling contractor?
Three things, before entry operations begin, under 29 CFR 1926.1203(h)(1): the location of each known permit space, the hazards or the reasons each one is a permit space, and any precautions the host employer or a previous contractor implemented to protect employees in that space. That third item is the one people forget. A space that was made safe by a previous contractor's ventilation is not safe once the ventilation is gone.
What must the controlling contractor do?
Four things under 29 CFR 1926.1203(h). Obtain the host employer's information about permit space hazards and previous operations. Pass that information, plus any additional hazard information it has, to each entity that will perform entry work. Coordinate entry operations when more than one entity is working in or near the same permit space at the same time. And debrief each entity afterward about the program it followed and any hazards it encountered or created. The debrief is a real requirement and it is almost never done.
What must the entry employer give back to the controlling contractor?
Two things, under 29 CFR 1926.1203(h)(3). The entry employer must obtain all of the controlling contractor's information about permit space hazards, and must inform the controlling contractor of the permit space program it will follow and of any hazards it confronted or created in the space. The information flow runs both directions, and an entry employer that takes the site briefing and says nothing back is out of compliance.
What happens if there is no controlling contractor on site?
The duties do not disappear. Under 29 CFR 1926.1203(i), where there is no controlling contractor present at the worksite, the host employer or the employer that arranged to have the work performed takes on the controlling contractor's responsibilities. On a small job with an owner hiring trades directly, that is the owner.
Do I need to do anything if there are permit spaces on site but my employees will not enter them?
Yes. Under 29 CFR 1926.1203(c), if you decide that employees you direct will not enter a permit space, you must take effective measures to prevent those employees from entering it. Deciding not to enter is a decision that creates a duty rather than removing one. A written instruction with no barrier, no lock and no sign is not an effective measure.
Is the contractor who creates a permit space responsible for the warning sign?
Only where it reasonably anticipates that the employees it directs may enter that space. The sign duty attaches to the employer whose people might go in, not automatically to whoever created the space. That is worth knowing on a job where one trade cuts an opening and another trade works inside it, because the obligation may sit with the second contractor rather than the first.
What does the danger sign have to say?
29 CFR 1926.1203(b)(1) requires the employer to inform exposed employees of the existence, the location and the danger of each permit space, by posting danger signs or by any other equally effective means. The standard gives the wording as an example rather than a mandate: DANGER, PERMIT-REQUIRED CONFINED SPACE, DO NOT ENTER, or other similar language. Equally effective means is a real alternative, but if you use one you have to be able to show it reached the exposed employees.
Do employers have to have a written confined space program?
Yes, where workers will enter permit spaces. If entry will occur, the employer must develop and implement a written permit space program. If no entry will occur, the written program requirement does not attach, but the duty to prevent entry under 1926.1203(c) does, along with the evaluation and the sign or equally effective notification.
Can an entry supervisor also serve as an attendant?
Yes. An entry supervisor may also serve as an attendant or as an authorized entrant, provided that person is trained and equipped for each role they fill. The limit is practical rather than regulatory: an attendant may not have duties that interfere with monitoring and protecting the entrants, so one person covering two roles on a live entry usually fails on the attention requirement, not on the permission.
If a rescue service fails to notify us it is unavailable, will we be cited?
No, provided you did your part. OSHA will not cite the entry employer as long as it informed the rescue service that rescue services may be needed and told the service of the requirement that it notify the employer if it becomes unavailable. That makes the arrangement with the rescue service a documented conversation rather than an assumption. An employer that never contacted the service at all has no protection here.
Does the size of the entry employee matter in judging limited egress?
No. Whether a space has limited or restricted means of egress is a fact-dependent determination based on the size of the entrance and the configuration of the inside of the space. It is not dependent on the size of the entry employee. A space does not stop being a confined space because you send a smaller person in, and this is a real argument people try to make on job sites.
What counts as serious physical damage under the standard?
An impairment or illness in which a body part is made functionally useless or is substantially reduced in efficiency. Injuries of that severity typically require treatment by a licensed healthcare professional. An injury that would be handled with first aid only does not meet the definition. This matters because a recognized serious safety or health hazard is one of the four characteristics that make a confined space permit-required, and it is the broadest of the four.
Sort out the roles before somebody opens a hatch
If you are a general contractor with subs entering permit spaces, or a specialty contractor being handed a site briefing you are not sure is complete, that is worth an hour before the job rather than a deposition after it. Call 949-954-6581 or use the contact page.