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§ 02
When a permit is required
Permit triggers and exempt work for Trenton
All construction, alteration, repair, demolition, or change in occupancy requires a permit and compliance with the New Jersey Uniform Construction Code and Uniform Fire Code.
Exterior painting of residential properties (exterior painting in historic districts requires a historical permit)
- Exempt Exterior painting of residential properties (exterior painting in historic districts requires a historical permit)
Note: Many other work types require permits, including additions, alterations, decks, demolition, fences, roofing, siding, and more. Confirm your specific project with the Department of Inspections.
Required documents
- Two sets of sealed plans (three sets for restaurants) signed by NJ-licensed architect or engineer
- Construction Permit Application
- Applicable subcode technical sections (Building, Electrical, Plumbing, Fire Protection, Mechanical, Elevator)
- Proof of contractor registration with New Jersey Division of Consumer Affairs
- Zoning approval documentation if required
- Building code
- New Jersey Uniform Construction Code (NJ UCC) and Uniform Fire Code
- Permit validity
- 12 months from the date of the last inspection per New Jersey Uniform Construction Code.
- Owner-builder
- All plans must be prepared and sealed by a New Jersey-licensed architect or engineer; owner-builders may not prepare their own plans.
- Contractor requirements
- All contractors must be registered with the New Jersey Division of Consumer Affairs. Zoning approval may be required before UCC permit issuance.
§ 03
Application process
Typical processing: 20 working days for plan review; 48 hours for single trade permits.
- 01 Contact the Project Application Review Committee (PARC) for Planning and Zoning requirements and approvals.
- 02 Prepare two sets of sealed plans (three sets for restaurants) completed by a New Jersey-licensed architect or engineer.
- 03 Submit plans to the Department of Inspections, 2nd Floor, City Hall.
- 04 Plan review is completed within 20 working days from the time the construction inspector accepts the plans.
- 05 Single trade permits are issued within 48 hours of acceptance.
- 06 Pay all required permit, plan review, and application fees.
- 07 Proceed with construction and schedule inspections as work progresses.
Typical processing time: 20 working days for plan review; 48 hours for single trade permits.
Source: Division of Technical Services, Department of Inspections ↗
§ 04
Fee schedule
Trenton building permit fees
Fee type
Amount
01
Minimum permit fee
Contact Department of Inspections for current fee schedule
02
Plan check fee
Calculated as percentage of permit fee
03
Permit fee formula
Based on project type, scope, construction value, and square or cubic footage.
04
Trade permit fee
Separate fees for each subcode (Building, Electrical, Plumbing, Fire Protection, Mechanical, Elevator)
Consult with Department of Inspections regarding accepted payment methods and surcharge policies.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- Department of Inspections, 2nd Floor, City Hall (in-person)
- Building: (609) 989-3571; Electrical: (609) 989-3587; Plumbing: (609) 989-3546; Fire: (609) 989-3555 (phone)
- Scheduling deadline
- Requests must be submitted at least 48 hours prior to desired inspection time.
- Inspection hours
- Monday - Friday, 8:30 AM to 4:30 PM
Typical sequence: Required inspections at various phases of construction. Final inspection required before Certificate of Occupancy is issued.
Source: Division of Technical Services, Department of Inspections ↗
§ 06
Frequently asked
Common questions about Trenton permits
01 Do I need a building permit in Trenton, NJ? ▸
All construction, alteration, repair, demolition, or change in occupancy requires a permit and compliance with the New Jersey Uniform Construction Code and Uniform Fire Code.
02 How much does a building permit cost in Trenton, NJ? ▸
Building permit fees in Trenton, NJ are set by the local building department and vary by project type and valuation. The minimum permit fee is Contact Department of Inspections for current fee schedule. Fees are calculated as: Based on project type, scope, construction value, and square or cubic footage.. Plan check fee: Calculated as percentage of permit fee.
03 How do I apply for a building permit in Trenton, NJ? ▸
To apply for a building permit in Trenton, NJ, follow these steps: 1. Contact the Project Application Review Committee (PARC) for Planning and Zoning requirements and approvals. 2. Prepare two sets of sealed plans (three sets for restaurants) completed by a New Jersey-licensed architect or engineer. 3. Submit plans to the Department of Inspections, 2nd Floor, City Hall. 4. Plan review is completed within 20 working days from the time the construction inspector accepts the plans. 5. Single trade permits are issued within 48 hours of acceptance. 6. Pay all required permit, plan review, and application fees. 7. Proceed with construction and schedule inspections as work progresses.
04 How long does it take to get a building permit in Trenton, NJ? ▸
Building permit processing times in Trenton, NJ typically run 20 working days for plan review; 48 hours for single trade permits.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in Trenton, NJ? ▸
Not all construction work requires a permit in Trenton, NJ. The following work is generally exempt: Exterior painting of residential properties (exterior painting in historic districts requires a historical permit). Note: Many other work types require permits, including additions, alterations, decks, demolition, fences, roofing, siding, and more. Confirm your specific project with the Department of Inspections. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in Trenton, NJ? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in Trenton, NJ via: Department of Inspections, 2nd Floor, City Hall, Building: (609) 989-3571; Electrical: (609) 989-3587; Plumbing: (609) 989-3546; Fire: (609) 989-3555. Requests must be submitted at least 48 hours prior to desired inspection time..
last verified April 2026
source Division of Technical Services, Department of Inspections ↗
entry id permits/new-jersey/mercer/trenton
Educational reference. Permit rules and fees change — confirm current requirements directly with Division of Technical Services, Department of Inspections before applying. Jaspector is not legal advice.