Construction Noise Mitigation Plan Requirements in NYC

Before any noise-generating work begins at a construction site in New York City, the contractor must adopt a written noise mitigation plan for that site. An NYC construction noise mitigation plan is required under Section 24-220 of the Administrative Code, and it has to spell out the specific methods, procedures, and technology used to control noise from every device and activity on the job. Skip it and the first-offense fine is $875. Work out of compliance with it and penalties climb to $4,200 by the third offense.

What the Plan Has to Cover

Section 24-220 requires the plan to identify each noise-generating device or activity at the site and describe the mitigation strategy that goes with it. That means naming the equipment (jackhammers, generators, pile drivers, saws, compressors) and stating how each will be quieted: mufflers on impact tools, sound-attenuating enclosures around portable generators, quieter equipment selections where available, and lower-noise methods such as hydraulic pile driving instead of impact hammers.¹

The permit holder is responsible for compliance and for making sure everyone working at the site understands the plan’s provisions.¹

Perimeter Barriers Near Residences

When the site sits within 200 feet of a residential building, the plan has to address the perimeter barrier specifically. Noise-resistant material must line the interior face of the barrier, and the barrier must break the line of sight between the noise source and indoor receivers up to 20 feet above grade where practicable. Maximum barrier height is 15 feet, though shipping containers or truck trailers positioned along the site edge can serve as semi-permanent barriers and can be double-stacked to reach 16 feet when needed.²

Posting, On-Site Copies, and Filing With DEP

A copy of the plan has to stay at the construction site, displayed conspicuously on the exterior, and made available for inspection by the public and enforcement personnel. If there’s no exterior structure to post on (an open lot, say), the plan still has to be on site and accessible. A separate Construction Noise Contact Sheet must be posted on the fence outside the site so anyone bothered by the noise knows who to reach.¹

Filing runs on a 30-day clock. The plan must be filed electronically with DEP no later than 30 days after construction begins, as long as it follows DEP’s standard rules for every device and activity on the site. Plans that deviate from those standard rules, or alternative plans tied to an undue-hardship after-hours application, need the Commissioner’s prior approval under Section 24-221.¹

When You Have to Update the Plan

The plan is a living document. If new equipment or activities not anticipated at the start of construction are introduced, the plan must be updated. DEP can also direct amendments when after-hours work at a site generates aggregate sound levels that exceed allowable thresholds, even where the original plan was followed to the letter. If the Commissioner calls a conference over that kind of exceedance, failing to attend or failing to amend the plan within the prescribed timeframe is itself a violation.¹

Who’s Exempt and Who Gets Extra Time

Two situations shift the ordinary rule. Alterations and repairs on owner-occupied one- or two-family dwellings are exempt from the plan requirement altogether, though the homeowner still has to obey the permitted-hours rules and the general noise prohibitions.¹

Emergency work runs on a different clock. When there’s a genuine threat to public safety or an imminent interruption of services required by law, contract, or franchise, the plan must be in place within three days of the start of construction rather than before. The plan requirement itself doesn’t disappear; only the timing changes. Mischaracterizing routine work as emergency work to skip the planning step exposes the contractor to the full penalty schedule once DEP inspects.¹

Alternative Noise Mitigation Plans for Big Projects

Some projects need an Alternative Noise Mitigation Plan (ANMP) instead of the standard version. As of April 21, 2026, the updated ANMP monitoring rule applies to new buildings with a gross floor area of 200,000 square feet or more when after-hours work is planned for 30 or more days (consecutive or not) and the site is within 50 feet of residential receptors.³

A qualifying project has to install at least one continuous noise monitoring device facing the nearest residential or sensitive receptor. The device has to be mounted 8 to 10 feet off the ground, use a weather-protected outdoor microphone compliant with IEC 61672-1, and sit at least one foot from the nearest surface to avoid sound reflection. Monitoring continues throughout construction until only low-noise interior work remains. The ANMP application also has to include a map of all sensitive and residential receptors within 75 feet of the site.³

Two categories are exempt from the ANMP monitoring requirement: construction of buildings where all units are affordable housing, and emergency work as defined in Section 24-223.

After-Hours Work and the Plan

Standard construction hours run weekdays 7:00 AM to 6:00 PM. Anything outside that window, or work on Saturdays or Sundays, requires an after-hours work authorization from the agency that issued the construction permit. Section 24-223 conditions that authorization on the applicant certifying that a noise mitigation plan exists for the site and complies with DEP’s rules.⁴

Authorization is available in three situations: emergency work (with authorizations expiring no later than 90 days after issuance, renewable while the emergency continues), work that cannot reasonably be done during standard hours without creating unsafe conditions, and projects where standard hours would impose undue hardship, such as major infrastructure work that would paralyze traffic during the day.

There’s one narrow homeowner exception to the hours rule: an owner living in a one- or two-family dwelling can do alteration or repair work on Saturdays and Sundays between 10:00 AM and 4:00 PM, as long as the dwelling is more than 300 feet from a house of worship. Commercial buildings, multi-family residential construction, and new builds don’t qualify.⁴

The Department of Buildings charges an $80 per-day fee on top of a filing fee that scales with the number of after-hours days requested. Filing fees range from $130 for one to three days up to $650 for 13 to 14 days.⁵

Using a DEP-Approved Noise Consultant

Projects that call for alternative plans or Commissioner approval typically involve a DEP-approved noise consultant. DEP maintains the list, and eligibility turns on credentials. A licensed New York State professional engineer needs at least two years of sound-level measurement experience, one of them within the city. Someone without a PE license but with a bachelor’s degree in science or engineering needs four years of experience, two of them in the city. Without either credential, ten years of experience is required, five in the city. All applicants must have experience developing sound mitigation measures for buildings and equipment.⁶

Hiring from DEP’s approved list gives the plan a defensible pedigree if it’s later challenged.

Penalties When the Plan Is Missing or Ignored

DEP’s penalty schedule breaks out plan-related violations by type and offense number:

No noise mitigation plan adopted: $875 first offense, $1,750 second, $2,625 third.
Plan is inadequate or lacks required detail: $440, $880, $1,320.
Plan not kept on site or not made available for inspection: $440, $880, $1,320.
Work performed out of compliance with the approved plan: $1,400, $2,800, $4,200.
Construction at impermissible times or days: $1,400, $2,800, $4,200.

⁷

Those are the contested amounts. Default penalties, imposed when a contractor doesn’t respond to the notice of violation, run significantly higher. A first-offense failure to adopt a plan jumps from $875 to $1,400 on default. A first-offense noncompliance charge goes from $1,400 to $3,500.⁷

The Department of Buildings adds its own civil penalties for working after hours without a variance: $600 on a one- or two-family dwelling and $6,000 on any other building type. Repeat offenses within one year double the penalty.⁸

Fines aren’t the only consequence. DEP or the permitting agency can refuse to renew an after-hours authorization when a site isn’t operating in compliance with its plan, and violations become part of a contractor’s record, which can affect future permit applications and eligibility for city contracts.

How Enforcement Actually Works

DEP inspectors respond to complaints and run targeted site inspections. One detail matters more than most contractors realize: DEP can only issue a summons or Commissioner’s order when an inspector personally observes the violation. Photos and videos submitted by neighbors are treated as informational background, not standalone evidence for enforcement.⁹

Once a violation is written, the case goes to the Office of Administrative Trials and Hearings. Some issuing agencies offer a settlement or a chance to cure before hearing, though not for every summons type. The settlement offer comes from the issuing agency, not from OATH.¹⁰

1
New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
2
New York City Code Library. NYC Rules 28-107 – Perimeter Noise Barriers
3
NYC Department of Environmental Protection. Updated Alternative Noise Mitigation Requirements
4
New York City Administrative Code. NYC Administrative Code 24-222 – After Hours and Weekend Limits on Construction Work
5
NYC Department of Buildings. After Hour Variances Renewal Guidelines and Fees – Section: AHV Fees
6
AmLegal Library. NYC Rules 29-101 – Noise Consultants
7
NYC Department of Environmental Protection. NYC Administrative Code – Noise Code Penalty Schedule
8
NYC Department of Buildings. 1 RCNY 102-04 – Civil Penalties for Work Without a Permit and for Violation of Stop Work Orders
9
NYC.gov. Noise from Construction – NYC311
10
NYC Office of Administrative Trials and Hearings. Hearings and Defaults