Installation or reinstallation permits are required before any new or existing regulated boiler/unfired pressure vessel is installed, reinstalled, or moved in the state of Washington.

For examples on what types of boilers, pressure vessels, and water heaters are regulated by L&I, see our Boiler & Pressure Vessel Examples.

Rental Boiler Permits may be requested by calling 360-902-6400.


Installer is responsible for permit fee

A Boiler and Pressure Vessel Installation or Reinstallation permit fee of $74.00 must be paid by the installer. If you have any questions, please call us at 360-902-6400.

What the boiler owner/user needs to do

  1. You will need to complete a copy of the permit for each boiler and/or pressure vessel in your facility.  Fill out Section A only on the Boiler/Pressure Vessel/Water Heater Installation or Reinstallation Permit form.  Please be sure to fill out this section completely and in full to avoid any delays in processing. 
  2. Once the form is complete, save it to your computer in its original format (Microsoft Word) and email it to

You may also mail or fax it to the following address:
Dept of Labor & Industries
Boiler Section
PO Box 44410
Olympia WA 98504-4410
Fax: 360-902-5292

*If you choose to mail or fax, Signature is required for all documents. 

What L&I will do

  1. Review the Boiler/Pressure Vessel/Water Heater Installation or Reinstallation Permit form to ensure all information in the required fields has been completed.
  2. Within 48 hours after we receive the information listed above, Boiler program staff will review it. We will then:
    1. Send it back if it contains errors that must be corrected, OR
    2. Assign the permit a number.

We will email, fax, or mail a copy of the permit to the boiler owner/originator of the permit.

IMPORTANT: After we receive your permit application, we will assign an inspector, and send you the approved permit with your inspector's name and number. You must contact the inspector when you’re ready for inspection and post a copy of the permit on or very close to the boiler/pressure vessel.

checklists & inspections

Pre-inspection checklists

The checklists below address the most common violations found by field inspectors. Complete all applicable checklists before scheduling your inspection to ensure a successful inspection.

Getting your boiler inspected

The boiler or pressure vessel owner/user is responsible for contacting the L&I Boiler Inspector responsible for their inspection. The contact information of your inspector is listed on the permit.

billing & fees

The installer of a regulated boiler, pressure vessel, or water heater is responsible for obtaining the permit, and paying the permit fee. All other fees, such as inspection and certificate fees, are billed to the boiler owner after the final inspection has been completed. The final “Certificate of Inspection” will not be issued until the Boiler Program has received full payment. The fees for various services are listed below.

Pay a Boiler Invoice

Past due invoices

If your invoice is 90 days past due you may have to pay a late fee.

Permit & certificate fees

  • Boiler and pressure vessel installation/reinstallation permit fee (excludes inspection and certificate of inspection fee).
    • $74.00.
  • Certificate of inspection fee.
    • $31.80 per object inspected.

Boiler & pressure vessel inspection fees

Heating boilers Internal External
Cast iron-all sizes  $53.80  $43.00
All other boilers less than 500 sq. ft. $53.80 $43.00
500 sq. ft. to 2500 sq. ft. $107.70 $53.80
Each additional 2500 sq. ft. of total heating surface, or any portion thereof $43.00 $20.90
Power boilers  Internal External
Less than 100 sq. ft. $53.80 $43.00
100 sq. ft. to less than 500 sq. ft. $65.20 $43.00
500 sq. ft. to 2500 sq. ft.  $107.70  $53.80
Each additional 2500 sq. ft. of total heating surface, or any portion thereof $43.00 $20.90

Pressure vessels
Automatic utility hot water supply heaters per RCW 70.79.090 ( $9.40
All other pressure vessels:  Square feet = multiply length of shell by its diameter internal external Internal External
Less than 15 sq. ft $43.00 $31.80
15 sq. ft. to less than 50 sq. ft. $63.90 $31.80
50 sq. ft. to 100 sq. ft. $74.60 $43.00
For each additional 100 sq. ft. or any portion thereof  $74.50 $20.90

For information about other fees see WAC 296-104-700, or contact the boiler section.