Starting December 11, 2024, Local Law 147 will bring a significant change to the way “major buildings” are defined in New York City — a change that will directly impact construction planning, compliance, and workforce requirements across the five boroughs.

What’s Changing?

The current definition of “major buildings” is defined as:

  • Any building that is 10 or more stories or 125 feet or more in height.

Under Local Law 147, the new definition will include:

  • Any building that is seven or more stories or 75 feet or more in height.

This adjustment means that a broader range of projects will now fall under the major building category, triggering new regulatory obligations.

What’s Staying the Same?

The following criteria will continue to qualify a building as “major,” regardless of height:

  • A building footprint of 100,000 square feet or more; or
  • Designation by the DOB

Façade work remains excluded from these changes — it will still apply only to buildings exceeding 14 stories or 200 feet in height.

Who Will Be Affected?

The updated definition applies to:

  • Initial permit applications submitted on or after December 11, 2024; and
  • Permits issued on or after that date.
What Does This Mean for Your Project?

Projects that now meet the new threshold will be required to:

  • Develop and file a site safety plan;
  • Implement ongoing site monitoring throughout the life of the project.

These requirements are standard for major buildings and aim to enhance safety oversight on active construction sites.

Key Takeaways for Contractors and Developers

As more projects fall within the scope of “major buildings,” contractors should prepare for:

  • Longer permitting and review timelines;
  • Increased staffing needs, particularly for licensed safety professionals and compliance personnel;
  • New procedural steps in preconstruction planning and approvals.
Staying Ahead of Compliance

As the December 11 effective date approaches, it’s critical for developers, contractors, and construction managers to evaluate upcoming projects through the lens of these new requirements. Proactive planning, early engagement with safety professionals, and a clear understanding of Local Law 147 will be key to avoiding costly delays and maintaining compliance. By preparing now, you’ll ensure your projects move forward safely, efficiently, and in line with the latest NYC regulations.