How Does the NYC DOB Permit Process Work?

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.

FAQs

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. Our Brooklyn Brownstone in Carroll Gardens required ALT-2 filings for the gut renovation, along with a separate LPC application for the façade restoration, and two parallel approval tracks.

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: Prepare and submit drawings. The first step is having your architect prepare a complete set of construction documents and submit them to the Department of Buildings through their online portal. The submission includes architectural drawings, structural calculations if required, and supporting documentation such as energy compliance forms and special inspection agreements

Step 3: Plan examination. Once submitted, the Department of Buildings assigns a plan examiner who reviews the drawings for code compliance. The examiner either approves the filing or issues objections to specific items that need to be corrected or clarified before the permit can be issued. Your architect responds to these objections and resubmits. This back-and-forth can happen one or several times, depending on the complexity of the project.

Step 4: Permit issuance. Once all objections are resolved and the drawings are approved, the permit is issued. Work can legally begin only after the permit is in hand and posted at the job site.

Step 5: Inspections during construction. Depending on the scope of work, certain inspections are required during construction, typically for structural work, plumbing, and electrical. Your architect coordinates these inspections with the relevant trades and the Department of Buildings.

Step 6: 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 real example from our practice

The Olive Passive House in Olivebridge, New York, required a full new building permit filing with the local building department, coordination with energy code compliance documentation, and a third-party special inspection program for the panelized construction system. Every project has its own permitting complexity; understanding it upfront is one of the most valuable things an architect brings to a renovation.

If you have questions about the permit process for your specific project, we are happy to walk you through it.

You can reach us at info@plans.nyc