DOB now lets you apply, pay for, and get your supplemental building permits online.  These permits are required to install supplemental systems in buildings, per § 105.1.13 of the DC Municipal Regulations (DCMR). Only licensed DC contractors for each specific trade may apply for these permits. You may be required to complete a building permit for the supplemental permit.

• Supplemental Permit Guidelines 
• Get a Supplemental Online Permit Now
• Submission Requirements for Trade Permits

Important Details

• You cannot save a partly-completed application. 
• You must complete each box marked with an asterisk (*) before you can pay for and receive your permit.
• You may pay with Visa, MasterCard, or Discover.
• If the fee for your supplemental permit is more than your available credit, you cannot get the permit online. 
• You will get a supplemental permit application that you can print and bring in with payment. 
• Supplemental permits cannot be issued online if the work address is in a historic or fine arts district. The supplemental permit is issued as an Adobe PDF file. You can save it on your computer and print it.

OSPI Permit Types

• Electrical Supplemental Permit (includes Fire Alarm)
• Plumbing Supplemental Permit
• Gas Supplemental Permit
• Air Conditioning or Refrigeration Supplemental Permit
• Fuel Burning Equipment Supplemental Permit
• Miniature Boiler Supplemental Permit
• Unfired Pressure Vessel Supplemental Permit

Apply for a Permit

RELATED CONTENT

• Supplemental Plumbing Permit Application
• Supplemental Electrical Permit Application  
• Supplemental Refrigeration and Air Conditioning Permit Application