A mechanical permit enables you to install new mechanical equipment such as heating, venting, and air conditioning (HVAC) equipment and kitchen hood exhaust systems. It does not enable you to install plumbing, sprinklers, gas lines, refrigeration, and boiler pressure vessels; these all require their own permit.
You can get a mechanical permit as part of your construction permit, or you can get it separately.
You may also need a business license if you are working in Seattle, even if your office is outside the city.
We base your permit fees on the value of construction plus a $190 per hour review fee. We charge an additional fire review fee for kitchen hood exhaust systems. We describe your fees in more detail in our Fee Subtitle.
For most projects, you should plan for 9 weeks from the time you apply to the time we issue your permit. We try to finish our initial review of complex projects in 4 weeks, and 2 weeks for simple projects. We often ask you to make corrections after the initial review, which triggers a second review of your corrected plans.
The time it takes to get your mechanical permit depends on how complex your project is, how many corrections of your plans you need to make, and how quickly and completely you respond.
If your project is small, we can issue you a mechanical subject-to-field-inspection permit within 24 hours.
Get your property information. Find property information to help you plan your project.
Determine restrictions to your project. Research the codes to determine unit noise limits requirements.
Find incentives for your project. Research the City's different incentives that might apply to your project.
Get a project number. Get a project number by starting your application online or by submitting a preliminary application form. You will need to include either a location plan (for interior work) or a site plan (for exterior work). You can use the number to track your project.
Request a pre-submittal conference (optional). We recommend pre-submittal conferences for very complex projects, including buildings with unusual structural systems, substantial alterations, or work in environmentally critical areas or shorelines. One-hour pre-submittal conference fees vary based on the type of conference you need.
Apply for exemptions. You may need an exemption from code requirements if your project is located in an environmentally critical area or near the shoreline.
Prepare your plans. Plans should be to scale and easy to read and scan.
Fill out forms.
Coordinate with other agencies. You may need permits from other City of Seattle departments.
Prepare a complete set of drawings. Include a mechanical plan coversheet, vicinity map, site plan, and plans and elevations. For a detailed list of requirements see Tip 415, below. Also provide an equipment schedule (an example is in Tip 415) and heating and cooling load calculations where applicable.
Schedule an intake appointment. Call (206) 684-8850 to schedule an intake appointment at the Applicant Services Center, or schedule an electronic appointment.
Pay fees. Approximately 75 percent of your permit fees are due at intake. The fees are calculated based on your project value.
Make corrections and resubmit your plans. Your project reviewer will send you a corrections letter if changes are needed.
Pick up or print permit. You will be contacted when your plans are approved. You can pick up your permit and approved plans at the permit issuance counter in the Applicant Service Center. If you submitted your plans electronically, you can print your permit and approved plans from your DPD Project Portal.
Pay fees. You will need to pay all outstanding fees to pick up your permit.
Display your permit. Place your permit in a visible location on the project site.
Get related permits. You may need to get additional permits or approvals from other departments.
Request an inspection. See the mechanical inspections page for when to call us and how to schedule your inspection.
Close your permit. Your permit information will be archived in our electronic document management system.