Contractors beware: OSHA's general industry confined space standard may apply to you
However, they might have to think again, because 29 CFR 1910.146 could apply to construction companies that perform confined space work at industrial facilities or sites.
The construction regs define a "confined or enclosed space" as any space having a limited means of exit which is subject to the accumulation of toxic or flammable contaminants, or has an oxygen-deficient atmosphere.