Most construction in Bronx County, New York requires a permit from the New York City Department of Buildings, and an application must go through DOB review before work begins1. New York City's Zoning Resolution covers the county, while the rules for use, building size and parking vary by the lot's zoning district23.
At a glance
- Building permit
- Required for most construction1
- Permit office
- NYC Department of Buildings, including its Bronx Borough Office45
- Zoning
- Citywide zoning applies; rules vary by district23
- Sewer connection
- DEP approval and certification may be required6
- Inspections
- DOB inspects new structures and major alterations7
- Occupancy approval
- Required for new buildings and specified changes8
- Accessory dwelling
- Potentially allowed in qualifying one- or two-family homes9
Who to call
Building permits
New York City Department of Buildings — Bronx Borough Office
Building permits, inspections and Certificates of Occupancy for property in Bronx County
1775 Grand Concourse, 5th Floor, Bronx, NY 10453
Zoning
New York City Department of City Planning
The citywide NYC Zoning Resolution that sets zoning districts for every lot in Bronx County
Septic permits
New York City Department of Environmental Protection
Public sewer and wastewater treatment for Bronx County properties; there is no county septic authority
Also useful
Office of the Bronx Borough President
Community land-use review (ULURP referrals) on larger Bronx projects; does not issue building, zoning or septic permits
851 Grand Concourse, 3rd Floor, Bronx, New York 10451
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Bronx County, New York?
Yes, for most construction. Before a Bronx County construction project begins, an application must be submitted to the New York City Department of Buildings for code review, and the majority of construction requires a DOB permit1. That wording matters: it does not mean every repair or minor job needs the same permit, so describe the exact scope of work to DOB before assuming an exception. The owner-builder question also deserves a direct check with DOB; the available information indicates that licensed professionals file and licensed contractors perform most permitted work, but a complete owner-builder exemption rule could not be confirmed10.
Who issues Bronx County building permits, and how do you reach them?
The New York City Department of Buildings handles building permits, inspections and occupancy documents for Bronx properties. Some applications may be submitted at a borough office, while some filings must go through DOB NOW: Build4. The Bronx Borough Office is at 1775 Grand Concourse, 5th Floor, Bronx, NY 10453, and its customer-service number is (718) 960-47105. For Certificate of Occupancy questions, call (718) 960-47405. Permit fees depend on the job: the published schedule gives a $2.60 rate for each $1,000 above $5,000 for covered alteration applications involving one-, two- or three-family homes, while other work has different rates and minimums11.
Does Bronx County have zoning?
Yes. New York City's Zoning Resolution establishes zoning districts and land-development rules throughout Bronx County2. The parcel's mapped district matters because use, building bulk, parking and special-purpose controls vary by district3. That means there is no countywide answer for minimum lot size, setbacks, lot coverage, building height or minimum dwelling size; confirm the parcel's district with the Department of City Planning and then read the rules for that district. The published Zoning Resolution includes 126 zoning maps for the city12. A use that appears physically possible on a lot may still be limited by its district, so check zoning before paying for plans or relying on a listing's development description.
How do sewer and septic approvals work in Bronx County?
For a project connecting to a city sewer, the New York City Department of Environmental Protection must approve whether the sewer can accept the proposed sanitary or storm discharge6. A sewer certification is required for a new connection to a city sewer, private sewer, private drain, septic system or other approved outlet, and a sewer connection permit then authorizes the connection work6. Certification may also be required when an alteration or renovation increases flow6. Do not assume that public sewer availability alone clears a project. A complete Bronx-specific rule for septic permits, septic inspections or off-grid sanitation could not be confirmed; ask DEP about an unusual parcel before treating an on-site system as feasible.
Can you live in an RV or tiny home in Bronx County?
A complete Bronx County rule for living in an RV, camping temporarily or occupying a tiny or manufactured home could not be confirmed. What can be said is that most construction needs DOB review and a permit, and every parcel is subject to district-specific zoning controls123. For a conventional ancillary dwelling, qualifying one- or two-family buildings can add an ADU with exceptions9. The ADU rules include location, entrance, flood-risk and district conditions, and applications for the subgrade pilot are not currently accepted until DOB rules take effect9. Ask DOB and City Planning about the exact structure and intended occupancy before buying a lot for RV, tiny-home or ADU use.
Building or renovating in Bronx County: the steps, in order
- Identify the parcel's mapped zoning district and check its use, bulk, parking and special-purpose controls3.
- Ask DOB which filing route applies; some applications may go to the borough office and others must use DOB NOW: Build4.
- Submit the required plans and application for DOB review before construction begins1.
- Pay the project-specific permit fee; published rates and minimums vary by job type11.
- Obtain DEP approval, sewer certification and the later connection permit when the project adds or changes a covered sewer connection6.
- Schedule required development inspections for a new structure or major alteration and correct any objections before reinspection7.
- Obtain a Certificate of Occupancy or Temporary Certificate of Occupancy before legal occupancy when the project requires one8.
What should you check before buying land in Bronx County?
Start with the zoning map and the existing occupancy record. District rules vary across Bronx County, and a new building or a change in use, egress or occupancy can require a current or amended Certificate of Occupancy38. Confirm how the parcel connects to sewer and whether DEP certification will be needed for the proposed flow6. Check flood constraints before planning a below-grade dwelling because subgrade ADUs are restricted in specified flood-risk areas9. Finally, budget for permits and carrying costs: the typical Bronx County home value is $500,31213, while the median annual property-tax bill is $5,31014.
Watch-outs
- A building that lacks a required Certificate of Occupancy or Temporary Certificate of Occupancy cannot legally be occupied; older buildings may have different documentation rules, so verify the record before closing8.
- DOB inspections distinguish development work, such as new structures and major alterations, from enforcement inspections, and failed inspections can require corrections and reinspection7.
- Bronx zoning is not one uniform set of dimensional rules: use, bulk, parking and special-purpose controls depend on the parcel's mapped district3.
Sources
- Building Applications & Permits, quoted and re-checked
- Zoning Resolution, quoted and re-checked
- Zoning Resolution, quoted and re-checked
- Filing Permit Applications, quoted and re-checked
- New York City Department of Buildings — Bronx Borough Office (nyc.gov)
- Sewer Connections, quoted and re-checked
- What to Expect During an Inspection, quoted and re-checked
- Certificate of Occupancy, quoted and re-checked
- Ancillary Dwelling Units, quoted and re-checked
- NYC Department of Buildings — Permits by Type (2026 county census)
- Local Law 56 of 2016: Permit Fees for New Buildings and Alterations Updated, quoted and re-checked
- Zoning Resolution, quoted and re-checked
- Typical home value (Zillow): Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.