City Building Permits

Town of Smithtown, NY - Building Permit Guide

How to apply for a building permit in Town of Smithtown, New York. Permit authority, application steps, fees, and inspection requirements.

New York Suffolk County Updated March 2026

Permit Authority

Unincorporated areas of Smithtown outside incorporated villages.

Department
Town of Smithtown Building Department
Address
Town of Smithtown, Smithtown, NY
Phone
(631) 360-7520
Website
https://www.smithtownny.gov/BuildingDepartment/

Online Permit Portal

Open Building Department

Platform: • Account required: No • Submission: Online only

Additional resources:

Application Process

  1. Use the town Building Department and online residential permit tools where applicable.
  2. Submit the application and supporting materials before work begins.
  3. Schedule inspections through the department and obtain CO closeout.

Typical processing time: Typically 2-4 weeks for complete applications.

Source: Town of Smithtown Building Department

General Requirements

Building permits are required for new construction, additions, alterations, and signs.

Required Documents

  • Building permit application
  • Site plan
  • Construction plans
  • Owner information
Permit validity
Typically 6 months to 1 year from issuance.
Building code
New York State Uniform Fire Prevention and Building Code; New York State Energy Code
Contractor requirements
Contractors must be properly licensed and insured.

Fees

Permit fee formula
Based on project valuation per NYS code

Work That Does NOT Require a Permit

Contact the Town of Smithtown Building Department to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

  • (631) 360-7520 (phone)
Inspection hours
Monday-Friday, standard business hours

Typical inspection sequence: Varies by project type.

Additional Resources

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Town of Smithtown Building Department before applying.

Frequently Asked Questions

Town of Smithtown Building Permit FAQ

Do I need a building permit in Town of Smithtown, NY?
Building permits are required for new construction, additions, alterations, and signs.
How much does a building permit cost in Town of Smithtown, NY?
Fees are calculated as: Based on project valuation per NYS code.
How do I apply for a building permit in Town of Smithtown, NY?
1. Use the town Building Department and online residential permit tools where applicable. 2. Submit the application and supporting materials before work begins. 3. Schedule inspections through the department and obtain CO closeout.
How long does it take to get a building permit in Town of Smithtown, NY?
Typical processing time is Typically 2-4 weeks for complete applications..
How do I schedule a building inspection in Town of Smithtown, NY?
Inspections can be scheduled via: (631) 360-7520.

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.

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