Do I Need a Permit to Install a Mini Split?
Local examples
These are examples only, and rules change.
- Portland, Oregon: lists mini-split systems among projects that need a mechanical permit, and says most mechanical equipment projects also need an electrical permit.
- San Diego, California: a Simple MEP permit to install or replace one in a single-family home or duplex, with no plans needed.
- Bedford, Texas: a permit to install heating and air conditioning units. It doesn't name mini splits.
- Mukilteo, Washington: a mechanical permit to replace a heat pump or AC unit. It doesn't name new mini splits.
What the model code says
The 2015 International Residential Code, as published by Springville, Utah, exempts portable cooling units from mechanical permits. A mini split is an installed system with lines through the wall, so don't rely on that exemption without asking.
What to ask
Call or check the website of your city or county building department before you start, and give them your address and a short description of the job.
- Do I need mechanical and electrical permits, or just one?
- Does the wall opening or the outdoor unit location need review?
- Can a homeowner pull the permit, or must a contractor?
Why it's worth asking first
Portland, Oregon's 2022 permit guide says inspections catch problems early, that buyers, realtors or lenders may require unpermitted work to be corrected before closing, and that a lack of permits and inspection approvals may void insurance. Even where no permit is needed, the work generally still has to meet code and zoning rules.
Permit offices in major cities
- New York
- Los Angeles
- Chicago
- Dallas
- Houston
- Washington, DC
- Philadelphia
- Miami
- Atlanta
- Boston
- Phoenix
- San Francisco
- Riverside
- Detroit
- Seattle
- Minneapolis
- San Diego
- Tampa
- Denver
- Baltimore
- St. Louis
- Charlotte
- Orlando
- San Antonio
- Portland
Common questions
Do I need a permit for a DIY mini split?
Does a window or portable AC need a permit?
Related questions
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- Do I Need a Permit to Finish My Basement?
- Do I Need a Permit to Remodel My Bathroom?
- Do I Need a Permit to Replace My Roof?
- Do I Need a Permit to Replace a Water Heater?
Last verified 2026-11-03
- City of Portland, Oregon: Residential Mechanical Permits — Portland: mini-split systems are listed among projects requiring a mechanical permit; most mechanical equipment projects also need an electrical permit.
- City of San Diego, California: What Permits Do I Need? — San Diego: installing or replacing mini-splits requires a Simple MEP permit in single-family homes and duplexes; no plans needed.
- City of Bedford, Texas: When Is a Residential Building Permit Required? — Bedford: installing heating and air conditioning units requires a permit.
- City of Mukilteo, Washington: Do You Need a Permit for That? — Mukilteo: mechanical permit to replace a heat pump or AC; page doesn't address new mini splits specifically.
- City of Portland, Oregon: Do You Need a Permit for Your Residential Project? (January 2022) — Portland: permit to install exterior heat pump or air conditioning condenser units.
- Springville, Utah: Work Exempt From Permits (reproduces 2015 IRC Section R105) — 2015 IRC as reproduced: portable cooling units are exempt from mechanical permits.
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.