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Safety & OSHAaka: permit-required confined spaceaka: PRCS

Confined Space

In Plain English

A tight or enclosed space that is hard to get in or out of and may have dangerous air or physical hazards.

Definition

A confined space is a space large enough for a worker to enter and perform work, with limited means of entry or exit, and not designed for continuous occupancy. A permit-required confined space also contains serious safety or health hazards such as hazardous atmospheres, engulfment potential, or configuration hazards. Entry into permit-required confined spaces requires an entry permit, atmospheric testing, and a trained attendant.

Why It Matters in Bidding

Confined-space work drives both cost and risk in bids covering tanks, vaults, manholes, crawl spaces, and mechanical pits. Estimators must price the attendant, atmospheric monitoring, ventilation, rescue standby, and reduced productivity, and a missed permit-required classification can blow the labor budget and expose the contractor to citations.

Example

While taking off a sewage lift-station retrofit, an estimator flags the wet well as a permit-required confined space and adds line items for a hole watch, a four-gas monitor, blower ventilation, and a rescue retrieval system before pricing the pump replacement.

Related Terms

OSHACompetent PersonPersonal Protective Equipment (PPE)Site Safety Plan

Related Tools & Templates

Confined Space Permit

Frequently Asked Questions

It raises labor cost because every entry needs an attendant who cannot perform other work, plus monitoring equipment, ventilation, rescue provisions, and slower production rates. Estimators often apply a productivity loss factor to in-space labor and add standby crew time that does not show up in standard unit costs.
The employer whose workers enter the space owns the permit program, so each sub entering bears its own compliance duty. On multi-employer sites the GC typically coordinates a host program, identifies known hazards, and requires subcontractors to provide their own trained entrants, attendants, and rescue plans through scope language and prequalification.
If the documents clearly identify the space and conditions, price it in the base bid. When access, atmosphere, or engulfment risk is uncertain, carry an allowance or qualify the bid, because unforeseen permit-required conditions discovered after award commonly trigger change orders rather than absorbing into a fixed lump-sum number.

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