Last reviewed October 16, 2026. General information, not legal advice.
A competent person inspects every scaffold before each work shift and again after anything that could affect its structural integrity, such as high wind or an impact (OSHA 1926.451(f)(3)). NYC adds a signed, dated pre-shift report, except for supported scaffolds the Code doesn’t require to be designed (Building Code §3314.4.3.5).
Questions about your scaffold? Call (347) 378-9978.
A competent person. OSHA defines that role by ability, not by a certificate: the person spots hazards on the scaffold and holds the authority to fix them. OSHA’s interpretation letter confirms the standard sets no specific training for the role.
On NYC supported scaffolds, the Building Code gives the inspection to the competent person who supervises the scaffold’s use, and DOB’s 4-hour supported scaffold course covers that supervisor too.
| Scaffold | Who Inspects | When | Record |
|---|---|---|---|
| Supported | The competent person who supervises its use. | Before each work shift and after any event that could affect its integrity. | A signed, dated pre-shift report, waived for supported scaffolds the Code doesn't require to be designed. |
| Suspended | A licensed rigger or other person authorized under the applicable NYC requirements. | At installation and whenever required by the applicable code and site procedures. | Keep the required inspection and installation records; do not use the scaffold until it has been inspected and is safe. |
A pre-shift check hunts for visible defects in footing, bracing, planking, guardrails, ties and load. OSHA’s scaffold eTool lists the full set.
You can, once you meet every requirement below. Most owners hire a contractor who already meets them.
A standard supported scaffold under 40 feet needs no DOB permit. DOB defines standard as: not an outrigger scaffold, no hoist over 2,000 pounds, and a design load of 75 pounds per square foot or less (DOB owner requirements). The permit rule starts above 40 feet, while the design and 32-hour training rules start at 40 feet or more, so a scaffold at exactly 40 feet sits on the line. Ask your design professional or DOB before you build. The supervision and training rules below still apply.
A scaffold standing on a sidewalk shed or other temporary equipment counts that height toward the total. A scaffold on a roof or setback measures from the roof or setback up, without the building below.
| Job | Supervision and Design | Training |
|---|---|---|
| Any Supported Scaffold | A competent person directs the work. | A 4-hour DOB-approved course for every user, including the supervisor, renewed every four years (NYC DOB supported scaffold training requirements). |
| Supported Scaffold, 40 Feet or More | The same, plus a registered design professional designs it. | A 32-hour DOB-approved course for installers and removers, supervisor included, with an 8-hour refresher every four years. |
| Suspended Scaffold | A licensed rigger, licensed sign hanger or designated foreman stays on site (DOB). | A 16-hour course for every worker and a 32-hour course for the foreman. |
One OSHA rule covers every row: a competent person supervises and directs whoever erects, moves, alters or dismantles the scaffold (1926.451(f)(7)).
OSHA requires a supported scaffold with a height-to-base-width ratio above 4:1 to stay restrained from tipping by guying, tying, bracing or an equivalent (1926.451(c)(1)). Base width includes outrigger supports when you use them.
Illustration: a scaffold 4 feet wide at the base crosses the 4:1 line above 16 feet, and from there OSHA requires restraint. That is OSHA’s floor, not a green light below it. A manufacturer’s manual, your scaffold’s design or the competent person’s judgment can call for ties sooner.
You will also see 3:1. That figure comes from Ontario. Guideline No. 23 caps a free-standing tower at three times its narrowest base dimension, and Ontario’s construction regulation ties scaffolds at vertical intervals of no more than three times the least base dimension. Some tower manufacturers publish 3:1 limits too. On NYC jobs, OSHA’s 4:1 sets the minimum. If a manufacturer or your site’s design sets a stricter limit, work to that.
Checked October 16, 2026.
| Situation | Rule | More |
|---|---|---|
| Supported Scaffold Over 40 Feet | A DOB permit is required before erection and must be filed in DOB NOW: Build. A scaffold placed on a shed or other temporary equipment counts toward the 40-foot height threshold. For scaffolds on a roof or setback, measure upward from the roof or setback, as specified by DOB. | |
| Any Sidewalk Shed | A DOB permit is required before erection. Permits last 90 days and no longer renew automatically. Each renewal costs a $130 DOB fee and requires a repair-progress report, according to the DOB notice. Maintenance responsibility generally falls first to the general contractor, then the contractor performing the work, and then the property owner. | |
| Suspended Scaffold | File through DOB NOW: Build under the Suspended Scaffold work type, subject to the limited exceptions listed by DOB. Installation and removal notifications must also be submitted through the same system, as specified in the DOB notice. | |
| Construction Fence | Construction fencing is required around new-building and demolition sites. It must be installed before work begins and removed once the structure is complete, as specified by DOB. A fence extending into the roadway requires a DOT permit. | |
| Equipment, Materials, or Temporary Structures on the Street or Sidewalk | A DOT permit is required through NYCStreets. During a DOT construction embargo, active permits in the affected area remain suspended unless DOT grants a waiver. |
Not sure which rules apply to your building? Send us your address, borough, scaffold height and planned work.
Century 21 Contracting Corp erects scaffolding, builds sidewalk sheds and supplies fencing and barriers across all five boroughs, working from the Bronx since 2004. We hold a DCWP Home Improvement Contractor license and carry $2M general liability, and our work is DOB-permitted and compliant.
Ask any contractor who supervises and who inspects your job. We answer at the site visit.
Rather not manage this yourself? Send your address, borough, scaffold height and planned work, and we’ll tell you what your job needs.
A competent person. OSHA defines the role by the ability to spot hazards and the authority to fix them, and NYC has the competent person who supervises the scaffold's use do the pre-shift inspection. A licensed rigger also inspects a suspended scaffold's installation before first use.
Before each work shift, and after any occurrence that could affect its structural integrity. A weekly or monthly inspection schedule does not meet that rule.
Yes, once you meet the rules. A competent person supervises the work, and every user completes DOB's 4-hour supported scaffold course. A standard supported scaffold under 40 feet needs no permit. A permit starts above 40 feet, and a registered design professional's design and the 32-hour installer course start at 40 feet or more. DOB counts the height of any shed or temporary equipment under the scaffold. Suspended scaffolds need a licensed rigger, licensed sign hanger or designated foreman on site.
OSHA requires a supported scaffold with a height-to-base-width ratio above 4:1 to be restrained from tipping by guying, tying, bracing or an equivalent. Base width includes outrigger supports when you use them. A scaffold 4 feet wide at the base needs restraint above 16 feet. That is OSHA's floor, and a manufacturer's manual or the competent person can require ties sooner.
It is an Ontario limit and a common manufacturer limit: a free-standing tower's height should not exceed three times its narrowest base dimension. NYC jobs follow OSHA's 4:1 as the minimum, and a stricter manufacturer limit is the safer line.
No. Supported scaffolds over 40 feet and every sidewalk shed need a DOB permit, and DOB adds a shed's height to a scaffold standing on it. Suspended scaffolds file in DOB NOW, with narrow exceptions DOB lists. A standard supported scaffold under 40 feet needs none.
Call us, or send your address, borough, scaffold height and planned work.
