How Does the NYC DOB Permit Process Work?
By Daniel Kidd AIA | May 13, 2026 | NYC DOB, Permits
If you're renovating an apartment in New York City or buying one that needs work, the NYC Department of Buildings (DOB) is a name you're going to get familiar with quickly. The DOB oversees all construction in the city, and for most meaningful renovations, you need their approval before a contractor picks up a tool.
The process can feel intimidating at first. But once you understand the basic steps, it's a lot more manageable, especially when you have an architect in your corner to handle the filings. Here's a plain-language overview of how it works.
Understanding the DOB: What It Is and Why It Matters
The NYC Department of Buildings is the city agency responsible for making sure construction work is safe, legal, and up to code. Before you can legally start most renovation work, your architect needs to file plans with the DOB and get them approved.
Skipping this step is a serious risk. Unpermitted work can result in stop-work orders, fines ranging from $2,500 to $25,000, and significant complications when you try to sell or refinance your apartment. It can also be expensive to legalize after the fact, often costing two to three times what the permit would have cost upfront.
Navigating the Three Types of NYC Alteration Permits
For apartment renovations, the DOB uses three categories of alteration permits. Which one applies to your project depends on the scope of work:
ALT-1, Major Alterations. This is for significant changes that affect a building's use, occupancy, or the number of dwelling units. Combining two apartments into one, for example, typically requires an ALT-1. These are the most involved filings and often require a new or amended Certificate of Occupancy. Timeline: roughly 8–16 weeks for approval.
ALT-2, Standard Alterations. This is the most common permit type for apartment renovations. If you're redoing a kitchen or bathroom, moving walls, or making changes to plumbing or electrical — without changing the apartment's use or the number of units — you're likely in ALT-2 territory. Timeline: roughly 4–8 weeks.
ALT-3, Minor Alterations. For smaller, single-trade projects that don't affect multiple building systems. An example would be installing a new HVAC unit or doing limited electrical work. Timeline: roughly 2–4 weeks.
When in doubt, your architect will determine which filing type applies to your project. Filing under the wrong category can cause delays and DOB objections, so it's important to get this right from the start.
How the Process Works, Step by Step
Step 1: Hire a licensed architect. In New York City, you can't file renovation plans yourself. A Registered Architect (RA) or Professional Engineer (PE) must prepare and stamp the drawings and file them with the DOB on your behalf. At PLANS, this is where we come in: we measure your space, develop the design, and prepare a full set of construction drawings that comply with NYC building codes.
Step 2: Co-op or condo board approval (if applicable). If you live in a co-op or condo, which is most apartments in NYC, you'll need your building board's approval before filing with the DOB. As of January 2026, co-op and condo boards are now required to provide formal attestation in the DOB NOW system before a permit can be filed. This step typically adds 2–4 weeks to your timeline, so it's smart to start the board process early.
Step 3: File through DOB NOW. All permit applications in NYC are submitted through DOB NOW, the city's online filing portal. Your architect prepares and uploads the drawings, project description, and required documentation. This is also where fees are paid, filing and permit fees for apartment renovations typically range from $500 to $10,000 or more, depending on the scope.
Step 4: Plan review. Once filed, the DOB reviews your application for compliance with the NYC Building Code and Zoning Resolution. They may issue objections, essentially a list of questions or required changes, which your architect responds to and revises accordingly. For straightforward projects, this back-and-forth is minimal. For complex ones, it can take a few rounds.
Step 5: Permit issued, construction begins. Once the plans are approved and the permit is issued, construction can legally begin. Your contractor must have the permit on-site, and work must follow the approved drawings.
Step 6: Inspections during construction. Depending on the scope of work, DOB inspectors may visit the site to verify that construction is proceeding according to the approved plans. Your architect coordinates these inspections.
Step 7: Sign-off and permit closeout. When construction is complete, your architect conducts final inspections and submits a sign-off to the DOB to officially close out the permit. This step is easy to forget, but leaving a permit open can be a real problem when it comes time to sell or refinance. An open permit on a property can raise red flags for buyers and lenders alike.
A Note on Landmark Buildings
If your apartment is in a landmarked building or a historic district, which covers a significant portion of brownstones and pre-war buildings in neighborhoods like the West Village, Brooklyn Heights, and Park Slope, you'll need approval from the Landmarks Preservation Commission (LPC) in addition to the DOB. LPC approval must come first, before you can file with the DOB. This process adds anywhere from one to three months to your timeline, depending on the scope of the work.
One More Thing: Asbestos
Before any demolition work can begin on a building constructed before April 1, 1987, the DOB requires an asbestos assessment. A licensed asbestos investigator must test materials that will be disturbed, and an ACP5 form must be filed with the DOB. This applies to the vast majority of pre-war apartment buildings in Manhattan and Brooklyn. Your architect will factor this into the project timeline.