What Does an Open DOB Permit Mini Split NYC Actually Mean?

An open DOB permit mini split NYC situation means DOB authorized the installation work, but the contractor never completed the inspection and sign-off cycle. The job is recorded in the city’s system as unfinished. The permit status must read “Signed Off” in DOB NOW or BIS, any other status, including “Issued,” “In Process,” or “Partially Approved,” means the permit is still open. That open record follows the property, not the owner, and it surfaces on every title search, lender due-diligence pull, and co-op board document review.

Unlike a window AC or a PTAC sleeve unit, a ductless mini split is a split system, not a packaged unit. It does not qualify for the 1 RCNY 101-14 packaged-unit exemption. Any time the refrigerant line set penetrates an exterior wall, roof, or fire division, which is true of every standard mini split installation, a DOB mechanical (MS) work permit is required before work begins, and a Certificate of Compliance (formerly called the Equipment Use Permit or EUP) is required before the system is legally operated. Under NYC Admin Code §28-116.4.1, specified service equipment, including air conditioning systems, may not be operated until DOB issues that Certificate of Compliance after a satisfactory inspection and testing report.

Why Does an Unsigned Mini Split Permit Threaten Your Sale or Refinance?

Buyers’ attorneys and title companies run DOB and BIS searches on every NYC transaction. Open permits appear in that search and create title exceptions, escrow demands, and lender conditions that move your closing date. For refinances, lenders may require all open DOB items to be resolved before funding. The risk is not theoretical: an open permit on a mini split is fully visible to any lender, buyer, or title company searching your building’s BIN or block-and-lot number.

For co-op sellers, the exposure is slightly different from condos but no less real. A co-op purchaser’s attorney will pull a lien search and DOB records. If your alteration agreement required you to close all permits before or immediately after installation, an open mechanical permit may put you in breach of your agreement with the board, a separate problem from DOB itself. You need to close three distinct tracks for a clean resale: the mechanical permit, the separate electrical permit, and any outstanding alteration-agreement closeout requirement from your co-op or condo board.

How Do You Find Your Open Mini Split Permit in DOB NOW?

Start at the DOB NOW Public Portal (a810-dobnow.nyc.gov) or the Buildings Information System at BIS (a810-bisweb.nyc.gov). Search by your property address or Building Identification Number (BIN). Both systems are free and public. Under the “Permits” or “Jobs” tab, look for any mechanical systems filing tied to your apartment or building. Open permits will show statuses like “Issued,” “In Process,” or “Partially Approved”, not “Signed Off.” Note the job number, the filing type (Alteration 2 or Alteration 3 for most residential mini splits), and the name of the original applicant or contractor of record.

If the permit is recorded in BIS rather than DOB NOW, it predates the DOB NOW migration and may require a licensed PE, RA, or expeditor to retrieve the paper file from DOB’s archive before you can determine what is still outstanding. The original contractor’s name on the filing matters: if that contractor has since gone out of business, retired, or is simply unresponsive, a new licensed mechanical contractor and a PE or RA can file a superseding application to take over the job and push it to completion, this is a standard expediting move in NYC.

What Is DOB Actually Waiting On? The Mini Split Closeout Checklist

Every open mini split permit is blocked by at least one of the following. Confirm which applies to your job before engaging a contractor or expeditor:

• Special inspection never scheduled or submitted. Air conditioning systems require inspection and certification by a third-party Special Inspection Agency (SIA) accredited under NYC Building Code §1704.16 for Mechanical Systems. DOB no longer performs these inspections itself. If your original installer never hired an SIA, this is likely your primary blocker.
• TR1 form not filed or not certified. The TR1 identifies the responsible parties for special inspection. It must be on file and certified before the Certificate of Compliance can be issued. For jobs already in DOB NOW, the TR1 is submitted digitally as part of the mechanical systems filing.
• PW4 form not submitted or not signed and sealed. The PW4, “Application for Certificate of Compliance for Equipment”, must be submitted with the equipment specifications, manufacturer name, model number, and capacity. In DOB NOW: Build, PW4 information is captured in the Plans/Work (PW1) and Scope of Work tabs rather than on a separate paper form, but legacy paper PW4s still exist for older BIS jobs.
• Nameplate mismatch / Post Approval Amendment required. This is the most commonly overlooked failure point. A DOB inspector checking the installed equipment at sign-off verifies that the equipment’s nameplate data, model number, capacity in BTU or tons, refrigerant type, matches the DOB-approved plans. If the installed unit differs from what was filed (a common occurrence when contractors substitute equipment after plan approval), a Post Approval Amendment (PAA) must be filed and approved before the Certificate of Compliance can issue. No PAA, no sign-off.
• Electrical permit still open. The dedicated mini split circuit requires a separately filed electrical permit by a NYC-licensed master electrician. That permit has its own DOB electrical inspection. A signed-off mechanical permit with an open electrical permit is not a complete closeout.
• Outstanding DOB fees or renewal charges. Permits that remain open beyond their standard term can accumulate renewal fees. These must be paid before sign-off is processed.

If you are not sure which of these is blocking your job, our guide on Mini Split Special Inspection NYC: TR1 Form, Who Pays, and How It Affects Your DOB Sign-Off explains the special inspection process in detail, including who selects and pays the SIA and what the inspector is verifying on-site.

The Exact Closeout Sequence: Step by Step

1. Pull the full job record from DOB NOW or BIS. Note the job number, current status, applicant of record, and any open objections or outstanding technical reports.
2. Engage a licensed mechanical contractor and a PE or RA. If the original contractor is unavailable, a new contractor and design professional file a superseding application. They become the new applicant of record and can push the job through inspection and sign-off.
3. Check for a nameplate mismatch. Compare the installed equipment’s model number and capacity against the DOB-approved plans. If they differ, the PE or RA files a Post Approval Amendment before anything else moves.
4. File or confirm the TR1 form. The TR1 must identify the Special Inspection Agency and be accepted by DOB. For DOB NOW jobs, this is done digitally within the filing.
5. Hire an accredited Special Inspection Agency. The SIA visits the site, inspects the installed mini split for conformance with approved plans, verifies nameplate data, checks the refrigerant line-set penetration through the fire division, and certifies the TR1 upon satisfactory results.
6. Submit the certified TR1 and the PW4 (or DOB NOW equivalent) to request the Certificate of Compliance. The filing includes the signed-and-sealed PW4 form with equipment specifications. For DOB NOW jobs, this is submitted electronically and the Certificate of Compliance is issued digitally and can be printed from the portal.
7. Post the Certificate of Compliance card. Once DOB issues the approved, stamped Certificate of Compliance, it must be securely posted on or adjacent to the mini split equipment.
8. Confirm “Signed Off” status in DOB NOW. Do not rely on verbal confirmation from a contractor. Pull the job yourself in DOB NOW and confirm the status reads “Signed Off.”
9. Close the electrical permit. Confirm the electrical permit has also passed inspection and shows as signed off or closed.
10. Get your alteration agreement closeout letter. Request written confirmation from your managing agent or co-op/condo board that the alteration agreement is satisfied. Keep this with your closing documents.

What If the Original Contractor Is Gone?

This is one of the most common scenarios: a shareholder installed a mini split three or five years ago, the original contractor has retired, gone out of business, or simply won’t respond, and the permit is still open in BIS. DOB does not require the original contractor to close out the job. A new NYC-licensed mechanical contractor, working with a PE or RA, can file a superseding application to take over the job number and proceed through the remaining inspection and sign-off steps. The PE or RA reviews the as-built conditions, confirms the installed equipment matches the approved plans (or files a PAA if it does not), and then coordinates the special inspection. This superseding-filing path is the standard resolution for abandoned permits in NYC.

If you bought your apartment knowing there was an unsigned mini split permit from a prior owner, the obligation to close it passed to you at closing. There is no mechanism in NYC to retroactively assign the closeout cost back to the seller after the fact unless it was explicitly addressed in your purchase contract, another reason buyers’ attorneys flag open permits before contracts are signed.

Mini Split Permit Closeout: Cost and Timeline Comparison

DOB guidance indicates that obtaining sign-off or withdrawing a permit for work never performed typically takes about two weeks to three months, but mini split closeouts involving PAAs or superseding applications routinely push to the longer end of that range. Plan accordingly and do not wait until you have a contract in hand to start this process.

Common Mistakes to Avoid

• Assuming the mechanical contractor’s verbal “we’re done” is a sign-off. Only “Signed Off” status in DOB NOW counts. Always verify yourself.
• Forgetting the electrical permit. The mechanical sign-off and the electrical sign-off are two separate DOB actions. Many owners close one and assume the other is handled.
• Skipping the nameplate check before scheduling the SIA. Discovering a mismatch at the inspection fails the inspection, wastes the SIA fee, and adds weeks for a PAA.
• Trying to file a post-installation permit for unpermitted work. NYC DOB does not accept post-installation permits for HVAC work. If the mini split was installed without any permit at all, the path is an Alteration application and potentially a Certificate of Correction, a materially different and more expensive process than closing an existing open permit.
• Ignoring the board alteration agreement closeout. Even with a fully signed-off DOB permit, some co-op and condo boards require a separate written closeout notification. Missing this step can still create friction at the sale transfer stage.
• Waiting until you have a buyer. Starting the closeout process after a contract is signed adds unnecessary time pressure and can push your closing date or cost you a price concession.
• Confusing the Certificate of Compliance with the Letter of Completion (PW7). A PW7 is a Letter of Completion for the construction work permit. The Certificate of Compliance (PW4/COC) is the separate equipment certification for the mini split itself. Both may be needed depending on how the job was filed.

If your original installation also involved drilling through a pre-1960 masonry wall for the line set, you may also have lead paint disclosure obligations under NYC Local Law 1. Our guide on Mini Split Lead Paint NYC: Does Line-Set Drilling Trigger RRP or Local Law 1 in a Pre-1960 Co-op or Brownstone? covers what records you should have and what a buyer’s attorney may ask about.

For co-op owners whose mini split installation was part of a broader alteration that also touched gas lines, see our breakdown of Local Law 152 No-Gas Certification for Heat Pump Conversions in NYC, a separate filing requirement that sometimes runs in parallel with the mechanical permit closeout and is easy to overlook.

Frequently Asked Questions

What does “open DOB permit” mean for a mini split in NYC?

An open DOB permit means DOB issued a work permit authorizing the mini split installation, but the required inspection, special inspection certification, and sign-off were never completed. The permit status in DOB NOW or BIS shows something other than “Signed Off.” Until sign-off is obtained, DOB considers the work legally unfinished, the Certificate of Compliance for the equipment has not been issued, and the system technically cannot be legally operated under NYC Admin Code §28-116.4.1.

Does a mini split in NYC require a Certificate of Compliance?

Yes. Because a ductless mini split is a split system whose refrigerant line set penetrates a wall, roof, or fire division, it requires both a DOB mechanical work permit and, after inspection, a Certificate of Compliance (formerly called the Equipment Use Permit). This applies regardless of system size. Only packaged units of 3 tons or less installed through a window or sleeve may qualify for a permit exemption, a split system with an exterior wall penetration is not exempt.

Can I sell my NYC co-op or condo with an open mini split permit?

You can often proceed to contract, but the open permit will surface during the buyer’s due-diligence DOB search and in the title search for condo sales. The result is typically a title exception, an escrow holdback, or a lender condition requiring resolution before or at closing. Buyers’ attorneys routinely demand the seller cure open permits or fund an escrow. Closing the permit before listing eliminates this negotiation entirely and protects your sale price.

Who can close an open mini split permit if the original contractor is gone?

A new NYC-licensed mechanical contractor and a PE or RA can file a superseding application to take over the job number and become the new applicant of record. They then coordinate the special inspection, file the certified TR1 and PW4 equivalent in DOB NOW, and obtain the Certificate of Compliance. DOB does not require the original contractor to participate. This superseding-filing path is standard practice for abandoned or orphaned permits in NYC.

What is a Post Approval Amendment and when does a mini split need one?

A Post Approval Amendment (PAA) is a filing made in DOB NOW when the installed equipment differs from what was shown on the approved plans, most commonly when the contractor substituted a different model, brand, or capacity mini split after plan approval. The DOB inspector verifies nameplate data at sign-off, so a mismatch will fail the inspection. The PAA must be approved before the special inspection can be successfully certified and the Certificate of Compliance issued. Discovering and resolving a mismatch before the SIA visit is essential to avoiding a failed inspection and added delay.