Public-record due diligence

NYC DOB Permits and Violations Before Buying: A Practical Checklist

NYC building records can reveal open construction jobs, expired permits, unresolved violations, complaints, stop-work issues, and questions about legal use. A search result is not a verdict, however. Buyers should identify the exact record, match it to the building or unit, and route the issue to the right professional before relying on a listing description or assuming that a seller can close it out.

Published 2026-09-2712 min read

Use BIS and DOB NOW together

The NYC Department of Buildings says BIS contains property profiles, older permits and job applications, occupancy information, complaints, violations, and inspections. DOB NOW contains applications and records submitted through the newer system. The DOB NOW Public Portal FAQ specifically warns that the portal does not replace BIS yet and that some violations, OATH/ECB matters, complaints, and older filings remain in BIS.

Use a consistent first pass: confirm the borough-block-lot and Building Identification Number; open the BIS property profile; check the DOB NOW property profile and occupancy records; review HPD Online when relevant; then save the record numbers, status dates, and available PDFs. This sequence reduces the risk of mixing similarly named streets, condo lots, or multiple building addresses and is more reliable than a screenshot of one summary page.

Separate complaints, violations, jobs, permits, and sign-offs

A complaint reports an alleged condition; it is not the same as a violation. A violation records an agency enforcement issue. A job filing describes proposed work, while a permit authorizes a particular scope for a defined period. A permit can expire even though a job remains open, and a job can require a Letter of Completion, certificate of occupancy step, or other sign-off before the record is complete.

Do not collapse every open item into one red-flag count. Record the item type, number, description, issue date, current status, named respondent or applicant, and any disposition or sign-off shown. The buyer's question is not simply how many entries exist, but what each entry means for the property, the proposed use, financing, insurance, closing, and future alteration plans.

Confirm the legal-use record

A certificate of occupancy states a building's legal use or permitted occupancy. DOB explains that newer buildings need a CO and that later work changing use, egress, or occupancy can require an amended CO. Some pre-1938 buildings may not have a CO unless later alterations triggered one; a Letter of No Objection may sometimes be used to establish legal use. A Temporary Certificate of Occupancy has an expiration date and should not be treated as a final CO.

Compare the occupancy document with the property being sold: residential use, floor, number of dwelling units, cellar or basement treatment, and any commercial or accessory areas that matter. If the physical layout or listing description does not align with the record, ask the buyer's attorney whether an architect or engineer should review the discrepancy. Public database research alone does not determine legal use.

Condo, co-op, and townhouse records require different framing

In a condo, a public record may concern the entire building, a sponsor or board project, or work associated with the particular unit. Ask whether the item is a common-element issue, a unit-owner alteration, or an administrative building record. In a co-op, the corporation owns the real property, so building-level records generally sit with the corporation even when a condition or alteration is associated with one apartment.

For a townhouse or small building, the buyer may acquire the property and its unresolved owner obligations more directly. Conversion history, number of lawful units, extensions, decks, cellar or basement use, curb cuts, and major mechanical work may deserve closer comparison with the physical condition. The architect and engineer review guide explains when technical review may be useful.

Read violations by source, status, and consequence

DOB violations, OATH summonses formerly called ECB violations, and HPD Housing Maintenance Code violations are different record sets. DOB states that paying an OATH penalty does not by itself close the underlying DOB record; correction and an accepted certificate of correction may still be required. HPD Online separately provides complaints, violations, registration, charges, litigation, and vacate-order information for covered buildings.

Ask whether an item is active, dismissed, certified, pending correction, or only historical. Then identify who controls the cure and whether it affects the building, the seller, the unit, title, lender review, insurance, or planned work. An old open item can matter, but age alone does not establish severity. A recent closed item can still prompt questions about the underlying condition and repair history.

Match the records to what you can actually observe

Compare the listing floor plan, inspection observations, alteration agreements, board or managing-agent responses, and visible work with the public record. Enclosed balconies, combined rooms, added bathrooms, removed walls, relocated kitchens, roof decks, finished cellars, and changed means of egress are examples of conditions that may deserve a record question. The absence of an obvious filing in a quick search does not prove that work was unpermitted, and a filing does not prove that completed work matches the approved plans.

Create one discrepancy list. For each item, note the physical condition, related filing or lack of a located filing, the seller's explanation, and the professional who should respond. This is more useful than sending several people an undifferentiated BIS printout.

Three buyer scenarios show why the same record can mean different things

Scenario one: a condo buyer finds an open façade-related building item. The immediate task is to ask the managing agent or board-side source about scope, schedule, insurance, cost, and whether an assessment is expected, not to assume that one unit owner can close it. Scenario two: a co-op apartment shows a layout change that is not explained by the available building records. The buyer should ask counsel how alteration records and board approval can be requested and whether technical review is appropriate.

Scenario three: a townhouse has an open alteration job and the listing describes a use that does not match the available occupancy document. That issue may require attorney and architect review before the buyer relies on the layout, financing plan, or future renovation assumptions. The same words, such as open job, do not produce the same answer across these property types.

Build an issue tracker before contract questions close

For each material record, list the agency, record number, description, address or lot, building-versus-unit scope, status, missing document, responsible party, professional reviewer, proposed resolution, and deadline. Attach the underlying record link or PDF. Use the post-accepted-offer document request guide to keep public-record questions aligned with board, managing-agent, seller, and attorney materials.

Ask for a written answer to the practical transaction question: must the item be corrected, dismissed, signed off, disclosed, insured around, accepted by the lender, addressed in the contract, or simply monitored? Do not accept a vague promise that an item is being handled without identifying the owner, evidence, and timing. The buyer's attorney decides how a material issue should be treated in the contract and closing process.

What changes the answer

The answer changes with property type, tax-lot structure, the age and type of record, the exact work or condition, current versus dismissed status, occupancy documents, title and lender requirements, insurance, seller cooperation, building governance, and the buyer's planned use or alteration.

This article is process education, not legal, architectural, engineering, title, lending, or code advice. It does not determine whether work is legal, whether a violation binds a particular buyer, whether a seller must cure an item, or whether a lender will close. Route those decisions to the appropriate licensed or transaction professional.

Sources

Source freshness was checked on September 27, 2026. NYC Department of Buildings, Find Building Data: scope of BIS, DOB NOW, occupancy, permit, complaint, violation, and record-request tools. https://www.nyc.gov/site/buildings/dob/find-building-data.page

NYC Department of Buildings, DOB NOW Public Portal FAQs: BIS and DOB NOW coverage differences, violation limitations, complaints, and where to search older filings. https://www.nyc.gov/site/buildings/industry/dob-now-public-portal-faqs.page

NYC Department of Buildings, Obtain a Certificate of Occupancy: CO, TCO, Letter of Completion, and pre-1938 Letter of No Objection context. https://www.nyc.gov/site/buildings/industry/obtain-a-co.page

NYC Department of Buildings, What Is a DOB Violation? and Resolving Issues: public violation records and the distinction between penalty payment and accepted correction. https://www.nyc.gov/site/buildings/property-or-business-owner/what-is-a-dob-violation.page and https://www.nyc.gov/site/buildings/property-or-business-owner/resolving-issues.page

NYC Housing Preservation and Development, HPD Online: complaints, violations, registration, charges, litigation, block-and-lot information, and vacate orders. https://www.nyc.gov/site/hpd/about/hpd-online.page

Keep each next step tied to the right review path.

New development sponsor diligenceHow to Research a NYC New Development Sponsor and Track Record11 min read Document requestDue Diligence Document Request After an Accepted Offer in NYC9 min read Title report trackingTitle Report Objection Tracker for NYC Apartment Buyers10 min read Professional resourcesArchitect and Engineer Review Questions for NYC Townhouse Buyers10 min read Professional resourcesPermit Expeditor and Filing Representative Questions for NYC Buyers9 min read

Buyer cost checks

Keep taxes, assistance programs, and rebate estimates separate.

NYC buyer planningMansion tax cash-to-close guideCheck price-triggered New York and NYC buyer tax thresholds before treating a closing-cost estimate as complete.NYC buyer planningFirst-time buyer program timing guideKeep official assistance-program timing separate from buyer rebates, lender credits, and offer-stage assumptions.

FAQ

Common buyer questions

Is DOB NOW enough to check a NYC building?

No. DOB says BIS remains available for older filings, complaints, OATH/ECB matters, and some DOB violations that are not in the DOB NOW Public Portal. Search both systems and confirm the property identifiers.

Does an open complaint mean the building has a violation?

Not necessarily. A complaint reports an alleged condition, while a violation is an enforcement record. Review any inspection or disposition shown and ask the appropriate professional about a material unresolved condition.

Will an open DOB violation stop a condo or co-op purchase?

There is no universal answer. The effect depends on the violation, whether it concerns the building or unit, title and lender requirements, the responsible party, and the proposed resolution. Ask the buyer's attorney and other relevant professionals before relying on a closing assumption.

What if an old NYC building has no certificate of occupancy?

DOB explains that some buildings constructed before 1938 may not require a CO unless later alterations changed use, egress, or occupancy. A Letter of No Objection may sometimes establish legal use. Counsel should review the property-specific record and any later work.