Boiler & Pressure Vessel Permit

Due to staff workloads, we cannot support the over-the-counter permit phone service. If you have trade permit questions, contact us at and we will respond in the order they are received.

What Is It?

You need a permit to install boilers and pressure vessels in the city of Seattle. There are some special requirements to consider before applying for a permit. Boilers or pressure vessels must be:

  • Manufactured in accordance with the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code and bear the ASME Code symbol stamp
  • Registered with the National Board of Boiler and Pressure Vessels, except for cast iron boilers and miniature pressure vessels
  • Within the sizing requirements specified by the Seattle Energy Code, if it is used for space or comfort heating    

When choosing an installation location for boilers, consider:

  • The venting system (how you will route the boiler exhaust gases); this is not a consideration for electric boilers
  • How you will provide combustion air to the boiler room or enclosure
  • Whether there is a floor drain in the boiler room
  • Whether the boiler room is large enough for the required access clearance around and above the boiler

You may also need a business license if you are working in Seattle, even if your office is outside the city.

How Much Does It Cost?

Our fees for boiler installation permits are based on the size of the heating surface and electric power. Our fees for pressure vessels are based on their length times diameter in feet.

How Long Does It Take?

We issue boiler and pressure vessel permits over the counter, on the same day that you apply. You can apply at the Applicant Services Center. You don't need an appointment and the wait time is generally no more than 40 minutes.

Steps To Get Your Permit

Create an account. Go to the Seattle Services Portal and click the Register for an Account link in the upper right of the screen. Follow the prompts to create an account.

Start your application. Complete the Boiler-Pressure Vessel Permit application online using the Seattle Services Portal. (Click on Permits - Trade, Construction, and Land Use to get to the boiler permit.) Follow the application prompts. You will need:

  • Work site address and work activity location
  • Work site owner or tenant contact name, address, and telephone number
  • Contractor information, including any state license number and city business license number
  • National board serial number and manufacturer of the boiler or pressure vessel

If you are unable to use the Seattle Services Portal, you can submit a paper application.

Schedule an intake appointment. Schedule an electronic intake appointment through the Seattle Services Portal. You must upload all application documents by 7:00 a.m. on the day of your appointment. We may contact you that day for more information.  

If you cannot submit online, you can do one of the following:

  • Bring your application to the Applicant Services Center
  • Mail three copies of your application to:
    SDCI, OTC Permits
    700 Fifth Ave., Suite 2000
    P.O. Box 34019
    Seattle, WA 98124-4019

Pay fees. You need to pay your permit fees at intake. If you perform a high volume of installations, you may want to set up an advance deposit (trust) account with us. Trust accounts require that you maintain a minimum balance in the account. Fees for your permit applications are automatically drawn from the account as you submit them. For more information on setting up an escrow account, call the OTC Permit Desk at (206) 684-8464.

Pay final fees. We will notify you if you need to pay any final fees before we issue your permit.  

Print your permit. We will notify you when we have issued your permit and the documents are available in your Seattle Services Portal. Print the permit and approved plan set. 

Display your permit. Place your permit in a visible location on the project site.