What's Required in New York City
- Central and split-system installations and replacements are filed in DOB NOW: Build under the Mechanical Systems work type
- Plans are submitted by a Registered Design Professional (PE or RA); the work permit is issued to a Registered General Contractor
- 1- to 4-family homes and individual apartments: contractor also needs a DCWP Home Improvement Contractor license
- Packaged AC units up to 3 tons (5 tons in a 1- or 2-family home) in an existing building are exempt under 1 RCNY 101-14
- Equipment must comply with the NYC Energy Conservation Code (2025 edition for applications completed on or after March 30, 2026)
- Duct penetrations through fire-rated assemblies require fire-stopping
- Pre-April 1, 1987 buildings: asbestos assessment (ACP-5 or asbestos project filing) before work that disturbs existing materials
- Refrigerant handling must comply with EPA Section 608
Do You Need a Permit to Replace an AC or Furnace in New York City?
It depends on the equipment, and the answer is more often "no" than the internet suggests. The Department of Buildings lists the work it treats as a minor alteration in rule 1 RCNY 101-14, and packaged air-conditioning units sit squarely on the exempt list: up to 5 tons in a one- or two-family home, and up to 3 tons in any existing building, including units in existing windows or sleeves, as long as the job is not part of a larger alteration that needs a permit. A central or split system (an outdoor condenser paired with an indoor air handler, or a ductless mini-split) is not a packaged unit, so replacing one is filed with DOB as mechanical work. New ductwork, a new exhaust system, and any boiler or furnace replacement are filed too.
NYC HVAC Permit Rules by Scenario
| What you are doing | DOB filing | Rule |
|---|---|---|
| Window or through-wall AC up to 3 tons (36,000 BTU/hr) in an existing sleeve | None | 1 RCNY 101-14 Table 2, II.2; NYC311 |
| Packaged AC up to 5 tons in a 1- or 2-family home | None | 1 RCNY 101-14 Table 1, item 5 |
| Voluntary AC or ventilation system serving one floor, no lot-line openings, no fire-division penetrations | None | 1 RCNY 101-14 Table 2, II.1 |
| Central or split-system replacement (condenser + air handler, mini-split) | Alteration, Mechanical Systems work type | DOB NOW: Build mechanical filing guide |
| New or rerouted ductwork, new exhaust system | Alteration, Mechanical Systems work type | DOB NOW: Build mechanical filing guide |
| Boiler or furnace replacement | Filed by the licensed trade; a boiler also needs a DOB first-test inspection before use | DOB owner requirements |
| Temporary boiler during construction | Permit required | 1 RCNY 101-14 Table 2, II.9 |
How Much Is an HVAC Permit in NYC?
The DOB filing fee is small. Under Administrative Code Table 28-112.2 (as amended by Local Law 128 of 2024, in effect since December 21, 2025), an alteration in a one-, two- or three-family home costs a $130 minimum for the first $5,000 of job cost, plus $2.60 for each additional $1,000. A $9,000 central-air replacement therefore carries a filing fee of about $140; a $15,000 job is about $156. In apartment and commercial buildings under seven stories the minimum is $225 for the first $3,000, plus $10.30 per additional $1,000, so a $25,000 rooftop unit files at about $452. The larger cost is not the permit: a licensed Professional Engineer or Registered Architect has to prepare and submit the filing, and their fee is set by the market, not by DOB. Ask your contractor to break the two apart in the bid.
Who Files an HVAC Permit in New York City?
New York City does not license "HVAC contractors." The plans are submitted in DOB NOW: Build by a Registered Design Professional (PE or RA) under the Mechanical Systems work type, and the work permit itself is issued to a Registered General Contractor. For 1- to 4-family homes and individual apartments that contractor also needs a Home Improvement Contractor license from the Department of Consumer and Worker Protection. A new dedicated circuit for the equipment is a separate electrical permit filed by a licensed master electrician, and gas or oil-fired equipment brings in the licensed plumber or oil-burner installer. Equipment that needs a Certificate of Compliance (an Equipment Use Permit) gets it after DOB inspection.
What Else an NYC HVAC Job Triggers
Replacement equipment must meet the NYC Energy Conservation Code; the 2025 edition applies to applications completed on or after March 30, 2026, and DOB's guidance calls for sizing by ACCA Manual J and S rather than matching the old unit's tonnage. In buildings built before April 1, 1987, work that disturbs existing materials needs an asbestos assessment (an ACP-5 or an asbestos project filing) before demolition starts. New residential equipment now ships with A2L refrigerants such as R-32 or R-454B, which carry their own placement and ventilation rules. None of this is optional because the mechanical permit was exempt: the exemption in 1 RCNY 101-14 covers the mechanical filing only.
How to Get a HVAC Permit in New York City
Check the exemption first
Packaged units up to 3 tons in any existing building, or up to 5 tons in a 1- or 2-family home, need no DOB filing (1 RCNY 101-14). Central, split and ducted systems do.
Hire a PE or RA and a registered GC
The design professional prepares the Mechanical Systems filing in DOB NOW: Build; the permit goes to a Registered General Contractor (plus a DCWP HIC license in 1- to 4-family homes).
File the alteration
Filing fee: $130 minimum plus $2.60 per $1,000 over $5,000 in a 1- to 3-family home; $225 plus $10.30 per $1,000 over $3,000 in larger buildings under seven stories. Equipment specs and Manual J/S sizing are part of the submission.
Pull related permits
A new dedicated circuit is a separate electrical permit (licensed master electrician). Gas or oil-fired equipment goes through the licensed plumber or oil-burner installer.
Inspection and sign-off
DOB inspects before the system is put in service; boilers need a first-test inspection, and equipment that requires a Certificate of Compliance receives it after inspection.