What is it?

You need a Mechanical Permit any time you install new mechanical equipment such as heating, venting, and air conditioning (HVAC) equipment and kitchen hood exhaust systems. A Mechanical Permit does not enable you to install plumbing and sprinkler systems which require separate permits. Permits are not required for the following:
  • Portable heating appliances
  • Portable ventilation appliances and equipment
  • Portable cooling units
  • Steam, hot water/chilled water piping within any equipment or appliance
  • Replacement of any minor part that doesn’t alter the approval of the equipment/appliance
  • Portable evaporative coolers
  • Self-contained refrigeration systems with less than ten pounds of refrigerant and less than one horsepower
  • Portable fuel cell appliance not connected to power grid

How Much Does it Cost?

Fees for residential and multifamily buildings are based on the base fee, technology fee, and number of fixtures. Fees for commercial and mixed-use buildings are based on the valuation of the work and the technology fee. See the Fee Schedule (A-Z) page to download the Mechanical Fee Schedule for fee related information.

How Long Does It Take?

We try to finish our initial review of new and additions permit in 21 calendar days from submittal. Most mechanical permits are issued over the counter with the exception of new commercial, mixed-use and multi-family buildings, complete HVAC systems, A/C units, heat pumps, smoke and fire dampers, rooftop units or exhaust fans over 75 lbs in commercial buildings (like for like is exempt from plan review), type I and II hoods and all spray booths . How long it takes to get the final permit depends on how complex your project is and how many corrections, if any, you need to make.

Steps to Get Your Permit

1. Research
Get your property information.  Find property information to help you plan your project.  Property Viewer Interactive Map

Determine restrictions to your project. Research our codes to determine what occupancies are allowed in the building and what land uses are allowed in that zoning area.  Redmond Zoning Code
2. Start Permit Application
Prepare your plans. Plans should be electronic and should be to scale and easy to read.
Fill out forms
Mechanical Permit Application

Coordinate with other agencies. You may need permits or approvals from other agencies. These are the most common agencies you may need to work with for your permit type:
  • King County Public Health – Food Handling
  • King County DSC – Medical Facility
3. Submit Plans and Application Material
Simple over-the-counter permits can be applied for in person at the Development Services Center using a paper application form, and are issued at the time of application. Intake appointments are required when you are submitting any permit that requires plan review or the issuance of three (3) or more over-the-counter permits. Call 425-556-2473 to speak with a Permit Technician who can assist you in scheduling an intake appointment or use the Schedule an Appointment button below.

Pay fees
With over-the-counter permits, the total fee is due at the time of application. With projects requiring Plan Review, payment of the plan review fees and technology fees are due at intake and the permit fee and fixture fee is due once the permit is approved but before issuance.

4. Plan Review
For plan review projects, your project reviewer will send you a correction letter if changes are needed. Make corrections and resubmit your plans. The project reviewer will instruct you on how to upload new plans through the E-Track portal.

5. Get Permit
You will be contacted when your plans are approved. Once outstanding fees are paid, you may pick up your permit and approved plans at the Development Service Center with a blank USB drive or log into the E-Track Portal, you can print your permit and approved plans.
6. Schedule Inspection
Request an inspection. See the E-Track Portal page to schedule an inspection online or use the phone at 425-556-2435 and the IVR pin number on the permit to request an inspection. A Final inspection needs to be requested and approved to complete the inspection process.
7. Complete Project and Close Permit 
Final all inspections and close your permit. Your permit information will be archived in our electronic document management system.