Every contractor doing construction in New York City must adopt a written noise mitigation plan for each site before work begins, and the NYC construction noise mitigation plan has to spell out specific controls for every noise-generating device or activity used on the job. The requirement sits in Section 24-220 of the Administrative Code, and the penalties for skipping it or ignoring it climb fast: $875 for a first offense of having no plan at all, up to $4,200 for repeated work performed out of compliance with an approved plan.1NYC Department of Environmental Protection. NYC Administrative Code – Noise Code Penalty Schedule
Who Needs a Plan and When
Section 24-220 applies to every entity performing construction in the city whenever noise-generating devices or activities are used at the site. The plan must be in place before work begins. For genuine emergency work, the deadline shifts: the plan must be adopted within three days of the start of construction. Each permit holder is accountable for compliance and must make sure workers on the site understand what the plan requires.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
One exemption matters at the threshold. Alterations and repairs on owner-occupied one- or two-family dwellings are not subject to the formal plan requirement, though those homeowners still have to follow the permitted-hours rules and general noise prohibitions. Mischaracterizing routine work as an emergency to buy the three-day deadline exposes the contractor to the full penalty schedule once DEP inspects.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
What the Plan Must Contain
The plan must detail noise mitigation strategies, methods, procedures, and technology for every device or activity employed at the site. That means identifying each piece of noise-generating equipment and pairing it with a corresponding control.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
Equipment Controls
Typical measures include selecting quieter equipment, fitting mufflers on jackhammers and other impact tools, enclosing portable generators in sound-attenuating housings, and choosing low-noise methods where feasible. DEP highlights hydraulic pile driving over impact hammers as one preferred approach. Electric-powered excavators run roughly 5 to 13 decibels quieter than diesel equivalents depending on size, which can also help on sites where receptors are close.
Perimeter Barriers Near Residences
When the work site sits within 200 feet of residential buildings, noise-resistant material must line the interior face of the perimeter barrier. The barrier has to break the line of sight between the noise source and indoor receivers up to 20 feet above grade where practicable, with a maximum barrier height of 15 feet. 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.3New York City Code Library. NYC Rules 28-107 – Perimeter Noise Barriers
Display, Posting, and Filing
A copy of the plan has to stay at the construction site, displayed conspicuously on the exterior, and available for inspection by the public and enforcement personnel. On open lots or sites without exterior structures, the plan still has to be on site and accessible. A separate Construction Noise Contact Sheet goes on the fence so anyone affected by the noise can reach the responsible party.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
The plan must be filed electronically with DEP no later than 30 days after construction begins, provided it follows DEP’s standard rules for every device and activity on the site. Plans that deviate from those rules, and alternative plans tied to an undue hardship application for after-hours work, need the Commissioner’s prior approval under Section 24-221.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
Amendments and When DEP Can Force Changes
The plan is treated as a living document. If equipment or activities not anticipated at the outset are introduced, the plan has to be updated. DEP can also direct amendments when after-hours work at a site generates aggregate sound levels that exceed allowable thresholds, even if the original plan was followed. The Commissioner can require a conference with the contractor and order changes; failing to attend or amend within the prescribed timeframe is itself a code violation.2New York City Administrative Code. NYC Administrative Code 24-220 – Noise Mitigation Plan
Alternative Plans for Large After-Hours Projects
Some projects need an Alternative Noise Mitigation Plan (ANMP) rather than 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.4NYC Department of Environmental Protection. Updated Alternative Noise Mitigation Requirements
Projects meeting those criteria must 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 standards, and sit at least one foot from the nearest surface to avoid sound reflection. Monitoring runs throughout construction until only low-noise interior work remains. The ANMP application must also include a map of all sensitive and residential receptors within 75 feet of the site.4NYC Department of Environmental Protection. Updated Alternative Noise Mitigation Requirements
Two categories of work 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.
Because alternative plans and Commissioner approvals carry technical weight, contractors frequently retain a DEP-approved noise consultant to prepare them. DEP keeps an approved list, and hiring from it offers a defensible record if the plan is later challenged.5AmLegal Library. NYC Rules 29-101 – Noise Consultants
Penalties for Plan Violations
The penalty schedule separates problems with the plan itself from problems with the work:
- No noise mitigation plan at all: $875 for a first offense, $1,750 for a second, $2,625 for a third.
- Inadequate or insufficiently detailed plan: $440, $880, and $1,320.
- Failing to keep the plan on site or make it available for inspection: $440, $880, and $1,320.
- Performing work not in compliance with the approved plan: $1,400, $2,800, and $4,200.
- Construction at impermissible times or days: $1,400, $2,800, and $4,200.
Those figures assume the contractor appears and contests the summons. Default penalties, which apply when the contractor fails to respond, are substantially higher: a first-offense failure to adopt a plan jumps from $875 to $1,400, and a first-offense noncompliance charge goes from $1,400 to $3,500.1NYC Department of Environmental Protection. NYC Administrative Code – Noise Code Penalty Schedule
Beyond fines, DEP or the permitting agency can refuse to renew an after-hours authorization when a site is not operating in compliance with its plan. Persistent noncompliance can lead to work stoppages that cost far more in delayed schedules and labor than the fines themselves. Violations also become part of a contractor’s record, which can affect future permit applications and eligibility for city contracts.
How Enforcement Works
DEP inspectors respond to complaints and run targeted site inspections. One detail shapes exposure in practice: DEP can only issue a summons or Commissioner’s order when an inspector personally observes the condition. Photos or videos submitted by complainants are treated as informational background, not standalone evidence for enforcement.6NYC.gov. Noise from Construction – NYC311
When a violation is confirmed, the case is heard through the Office of Administrative Trials and Hearings. Some enforcement agencies offer settlements or an opportunity to cure the violation before a hearing takes place, though that option is not available for all summons types. Settlement offers come from the issuing agency, not from OATH itself.7NYC Office of Administrative Trials and Hearings. Hearings and Defaults
The practical sequence for a contractor is straightforward. Build the plan before work starts. Match a control to every piece of noise-generating equipment on site. Post the plan and the contact sheet where they can be seen. File electronically with DEP within 30 days. Update it whenever equipment or activities change, and respond quickly if DEP calls for a conference or amendment.