Mechanical, Electrical & Plumbing (MEP) Permits

You need a permit before you install, change, fix, or replace mechanical, electrical, or plumbing systems. 

MEP Permits are separate from Building Permits. You must get all of them if your project needs them. 

If you’re building or remodeling a house, duplex, or ADU (Accessory Dwelling Unit), the MEP work should be included in a Residential Building Combination Permit (RBC), so you won’t need separate MEP permits.

Most MEP permits do not need plans. But if your project is complex, you can request an optional Plan Review (for an extra cost). 

Plan Review is required for projects related to cannabis growing or processing. 

Some small or simple projects are exempt from needing a permit:

Mechanical Exemptions

• Portable heaters, fans, or coolers
• Pipes inside equipment (like heaters or air conditioners)
• Replacing small parts that don’t change the equipment
• Refrigerators that are part of permitted systems
• Stand-alone refrigeration units

Electrical Exemptions

• Plug-in string lights (like holiday decorations)
• Replacing wall outlets (not rewiring)
• Replacing circuit breakers with same type and size
• Phone, internet, or cable wiring

Plumbing Exemptions

• Fixing leaks in drain or vent pipes
• Unclogging pipes or toilets
• Fixing leaks in valves or fixtures, as long as no new parts are installed