Excavation, Trenching & Shoring FAQ

29 CFR 1926 Subpart P is OSHA's excavation standard for construction. It sets requirements for soil classification, protective systems (sloping, benching, shoring, and shielding), safe access and egress, spoil placement, and the daily inspection duties of the Competent Person. See our OSHA Excavation Standards page for official links.

OSHA requires that only trained and authorized personnel design protective systems and that a Competent Person, capable of identifying hazards and authorized to take corrective action, be designated for every excavation site. Employers are responsible for training workers on the hazards of the work they perform. Our Safety Training and Competent Person courses map directly to these requirements.

Non-compliance can result in significant OSHA fines per violation, stop-work orders, and in serious cases criminal referral if a fatality results from a willful violation. Trenching is consistently one of OSHA's most-cited and most fatal construction hazards, and enforcement has intensified in recent years.

Federal OSHA enforces 29 CFR 1926 Subpart P in most states, but roughly half the states run their own OSHA-approved state plans, which must be at least as protective as the federal rules and sometimes add requirements on top. See our State OSHA Plan Requirements page.

No. Unlike confined space entry, OSHA's excavation standard doesn't require a written permit for each dig. Instead it requires a Competent Person to evaluate soil and site conditions, select an appropriate protective system, and conduct daily inspections before and during the work.

Stable Rock, Type A, Type B, and Type C, in order from most to least stable. See our Soil Classification page for the full breakdown.

The designated Competent Person, using at least one visual test and one manual analysis test (such as a plasticity or dry strength test), classifies the soil type present. Our Competent Person course covers both test methods in detail.

Sloping cuts back the trench wall at an angle away from the excavation. The maximum allowable slope depends on soil type. See our Sloping vs. Benching vs. Shoring vs. Shielding comparison.

Benching cuts the trench wall into a series of horizontal steps rather than one continuous slope. Benching is not permitted in Type C soil.

Shoring is a support system, typically hydraulic or timber, installed to prevent trench walls from collapsing. See our Protective Systems page.

Shoring actively supports the trench wall to prevent a collapse; shielding (a trench box) doesn't prevent a cave-in, it protects workers by containing the collapse if one occurs. See our Sloping, Benching, Shoring & Shielding Explained page.

Yes, for most standard configurations. A registered professional engineer's design is required for excavations 20 feet or deeper, or for non-standard conditions tabulated data doesn't cover.

Whenever an excavation is 5 feet or deeper, unless it's entirely in stable rock or a Competent Person determines no hazard exists. A Competent Person can also require protection in shallower excavations if a hazard is identified.

For excavations 20 feet or deeper, or for protective system designs that fall outside standard manufacturer tabulated data. See our Protective Systems page.

Daily before work begins, after every rainstorm or hazard-increasing event, and whenever there's an indication of a possible cave-in or other hazardous condition.

Classifying soil, selecting and verifying protective systems, conducting daily inspections, and overseeing the site's written excavation safety program. See our Competent Person Requirements page.

No. Training builds the knowledge base, but the employer must formally designate the Competent Person and confirm they have the authority and site-specific understanding needed. See Credential Transparency.

The employer. OSHA doesn't require a specific third-party certification - the employer designates someone based on their knowledge, experience, and demonstrated ability to identify and correct hazards.

OSHA doesn't set a fixed limit, but the Competent Person must actually be able to perform required daily inspections and respond to hazards at each site they're responsible for.

The employer. OSHA requires legally mandated safety training to be provided at no cost to employees.

No. OSHA does not certify training providers or courses. This training is OSHA-aligned - built around 29 CFR 1926 Subpart P. See Credential Transparency.

No. OSHA does not approve or endorse individual excavation training courses or providers. Any language on this site describing the course as "OSHA-aligned" refers to content alignment with the standard, not OSHA approval.

A certificate of completion showing your name, the course, training hours, completion date, a certificate ID, and the issuing provider, HAZWOPER OSHA Training, LLC. See our Certificate Policy and each course page's sample certificate.

Yes, directly through HAZWOPER OSHA Training's certificate verification form.

They can. Roughly half the states run their own OSHA-approved State Plan, which may add requirements beyond federal OSHA. See our State OSHA Plan Requirements page.