NYC After-Hours Variance: Grounds, Filing, and Costs

Construction in New York City is restricted to weekdays between 7:00 AM and 6:00 PM, and any work outside that window requires an NYC after-hours construction variance from the Department of Buildings. The variance, known as an AHV, covers early mornings, evenings, Saturdays, and Sundays. You apply through the DOB NOW online portal at least three business days before the first intended workday, submit a noise mitigation plan, and pay a tiered filing fee plus $80 for each day of after-hours work.¹

When an AHV Is Required

If any part of your construction activity happens before 7:00 AM, after 6:00 PM, or on a weekend, you need a variance. The AHV authorizes only the timing of the work. All of your underlying DOB permits still need to be in place, and the city does not issue retroactive variances for work already done.

One narrow exception exists. Alterations or repairs to owner-occupied one- or two-family homes may be performed on Saturdays and Sundays between 10:00 AM and 4:00 PM without a variance.² It does not cover new construction, commercial work, or multi-family residential buildings.

The Five Grounds the City Will Accept

NYC Administrative Code § 24-223 lists five circumstances under which after-hours work can be authorized. Your application has to fit one of them, and the documentation required shifts depending on which you choose.³

Emergency work: a condition threatening public safety or likely to interrupt a legally required service. The authorization expires no later than 90 days after issuance and can be renewed while the emergency continues. The noise mitigation certification must be submitted within three days of starting the work.
Public safety: work that cannot reasonably be performed during standard hours because of traffic congestion or safety risk to workers and the public. This commonly covers highway and street-level projects. Also capped at 90 days.
City construction projects: work by or on behalf of city agencies for judicially mandated projects, consent orders, or public-interest infrastructure such as water, sewer, or transportation. This authorization lasts for the duration of the project.
Minimal noise impact: activities the Department of Environmental Protection has classified as generating minimal noise, typically interior tasks without heavy machinery or loud power tools.⁴
Undue hardship: unique site conditions, unforeseen circumstances, scheduling commitments, or financial factors outside the applicant’s control that make standard-hour work impractical. This is the most paperwork-heavy ground, and it requires a DEP-approved Alternative Noise Mitigation Plan rather than the standard plan alone.³

Noise Mitigation Plan

Every construction site in the city needs a Construction Noise Mitigation Plan before work starts, and that plan carries extra weight for after-hours authorization. Under § 24-220, the plan has to detail the equipment on site and the sound-dampening measures around it: portable barriers around compressors, mufflers on generators, scheduling the loudest tasks for the least disruptive portion of the approved window. A copy must stay at the site and be available for inspection.⁴

For undue hardship applications, the standard plan is not enough. You need a separate Alternative Noise Mitigation Plan filed with and approved by the DEP before after-hours work can begin. All activities covered by the ANMP are postponed until the DEP signs off, and the approved ANMP has to be posted at the job site.

Filing Through DOB NOW

Applications go through DOB NOW: Build and need to be linked to an active Job Filing number for the underlying permits. From the dashboard, select “+Permits,” then “After Hours Variance,” and enter the permit number. You can also open the applicable permit on the Work Permits dashboard and choose “Create AHV” from the Filing Action column.⁵

The system asks for the exact dates and time ranges proposed, the number of workers on site, the justification category, and the specific mitigation strategies drawn from your noise plan. Upload the noise mitigation plan and any supporting documents, including a DOT permit if applicable and the DEP-approved ANMP for undue hardship filings. An electronic signature certifying accuracy under penalty of law converts the draft to an active submission.

File at least three business days before the first intended workday. A Friday submission for a Monday evening pour is already cutting it close.¹

What It Costs

The cost has two components: an initial filing fee that scales with the number of days requested, and a flat $80 per day of after-hours work. Payment goes through the online portal at submission.⁶

1–3 days: $130
4–6 days: $260
7–9 days: $390
10–12 days: $520
13–14 days: $650

A weekend variance covering Saturday and Sunday runs $130 for the filing fee plus $160 for the two days of work, totaling $290.

Posting the Permit and Renewing on Time

The DOB sends its determination to the email tied to your eFiling account. Once approved, print the variance and display it at the work site. NYC Building Code Chapter 33 requires the permit to be posted somewhere visible to the public, alongside the primary project permit on the Project Information Panel. Failing to display it correctly can trigger a stop-work order on its own.

Every variance carries an expiration date. If the project runs long, file a renewal through the same portal before the current authorization lapses.⁶ A renewal extends the timeframe without a fresh scope of work or a resubmitted noise plan. Let the variance expire and you can be forced to start the entire application over, including the full review period and fee structure.

What Happens If You Work Without One

Enforcement comes from two directions, and the penalties stack.

On the DOB side, performing construction after hours without a variance, or continuing after a variance has expired, carries a flat penalty of $6,000 per violation for most buildings. For one- or two-family dwellings, the fine is $600.⁷

The DEP enforces the noise code separately. Construction at impermissible times under § 24-222 starts at $1,400 for the first offense, $2,800 for the second, and $4,200 for the third. Working out of compliance with your noise mitigation plan under § 24-224 follows the same escalation.⁸

The DOB can also issue a stop-work order halting all activity on the site until the violation is cleared. On a tight schedule, that delay often costs more than the fines. The DEP can refuse to renew after-hours authorization for a site that is not operating in compliance with its mitigation plan.³

Complaints Still Come In After Approval

Anyone can file a noise complaint through 311, and holding a valid AHV does not shield a site from scrutiny. The city explicitly tells residents they can report construction noise even when the site has a variance.² A DEP inspector has to personally observe the condition before a summons or Commissioner’s order can be issued; photos and video from complainants serve as informational context, not as the basis for enforcement.

Under § 24-223, if after-hours aggregate sound levels from a site exceed statutory limits, the DEP can still issue an advisory or violation even when the contractor is following the noise mitigation plan to the letter. Projects in residential neighborhoods see the most complaint-driven inspections, and contractors working in those areas often build in mitigation above what the plan strictly requires.

1
NYC Buildings. After Hour Variances
2
NYC311. Noise from Construction
3
Amlegal. NYC Administrative Code 24-223 – After Hours Work Authorization
4
NYC Department of Environmental Protection. Construction Noise Rules and Regulations
5
NYC Buildings. AHVs for DOB NOW Applications
6
NYC Buildings. AHVs Renewal Guidelines and Fees
7
NYC Buildings. 1 RCNY 102-04 – Civil Penalties for Work Without a Permit
8
NYC Department of Environmental Protection. Noise Code Penalty Schedule