California / Los Angeles County
HVAC Permit in Los Angeles County, California
Permit required
Yes, a permit is required
Before installing, altering, relocating, or replacing a furnace, heater, boiler, air conditioner, refrigeration compressor, air handling unit, evaporative cooler (other than portable), ventilation system, or appliance vent.
Issued byLos Angeles County Public Works, Building and Safety Division
By Mario Bailey, verified against official sources
Quick answer
Los Angeles County requires a mechanical permit for new, expanded, or replaced mechanical items in unincorporated areas. Title 29, Section 111.1 exempts only a narrow list: any portable heating appliance, portable ventilating equipment, portable cooling unit, portable evaporative cooler, steam, hot, or chilled water piping within regulated heating or cooling equipment, replacement of a component part or assembly of an appliance that does not alter its original approval, refrigerating equipment that is part of already-permitted equipment, and any unit refrigerating system. A straightforward residential changeout that needs no plan review can be self-issued online as an Express Mechanical Permit through EPIC-LA, which is issued automatically once fees are paid.
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When a permit is usually needed
Before installing, altering, relocating, or replacing a furnace, heater, boiler, air conditioner, refrigeration compressor, air handling unit, evaporative cooler (other than portable), ventilation system, or appliance vent.
What an HVAC permit costs in Los Angeles County
How Los Angeles County compares in California
No California jurisdiction we have verified sets a size threshold for this permit, so what actually differs between them is the fee.
| Jurisdiction | Permit needed? | Typical fee |
|---|---|---|
| Alameda County | Permit required | ...permit scope, 'Mechanical Permit 18% of Building Permit Fees, $140.00... |
| Contra Costa County | Permit required | Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00... |
| Fresno County | Permit required | Section 2510 Mechanical Code Fees, FY 2026-27: Issuing each permit $42.77 |
| Los Angeles | Permit required | ...equipment per LADBS Fee Sch.3 (7/2017), for example a gas furnace at $19... |
| Los Angeles Countythis page | Permit required | ...of Los Angeles Code, Ord No. 2013-0051), effective July 1, 2026: $41.35... |
| Orange County | Permit required | Mechanical Permit Application Flat Fee: $400 for FY 2024-25, $420 for FY... |
| Riverside County | Permit required | Residential Mechanical (BME-RMEC): $274.30 fixed fee, per Appendix A to... |
How to apply in Los Angeles County
In Los Angeles County, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb.
What most HVAC permit applications include:
- For Los Angeles County, a mechanical permit is required before anyone may install, alter, repair, remove, convert, or replace a heating, ventilating, or air conditioning system regulated by the code, and the work may not begin until the application is submitted and the permit is issued (IRC R105.1).
- For Los Angeles County, the application identifies the specific equipment being installed, such as a furnace, heat pump, or air conditioner, since the unit must be installed according to its listing and the manufacturer's installation instructions (IRC M1401.1).
- For Los Angeles County, the proposed equipment location must leave the clearances needed to clean coils and replace filters, blowers, motors, and controls after installation (IRC M1401.2).
- For Los Angeles County, the application carries the equipment sizing basis: ACCA Manual J building loads and Manual S equipment selection, or another approved sizing method, not a rule of thumb (IRC M1401.3).
- For a split system, the work covered by the permit includes refrigerant suction line insulation, since the piping is inspected against that standard once installed (IRC M1411.6).
General submittal guidance from International Residential Code (IRC), 2021 edition, Chapter 1 (Permits) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. Los Angeles County Public Works, Building and Safety Division sets the exact checklist for Los Angeles County.
Where to apply in Los Angeles County:
Los Angeles County Public Works, Building and Safety Division
- Los Angeles County Public Works, Building and Safety Division, 3rd Floor, 900 S. Fremont Avenue, Alhambra, CA 91803
- Phone: 626-458-3173
HVAC Permit in Los Angeles County compared with nearby California localities
| Locality | Permit needed? | Threshold | What each California schedule says | Verified |
|---|---|---|---|---|
| Los Angeles County | Permit required | Any size | ...the County of Los Angeles Code, Ord No. 2013-0051), effective July 1, 2026: $41.35... | |
| Alameda County | Permit required | Any size | ...of a building permit scope, 'Mechanical Permit 18% of Building Permit Fees, $140.00... | |
| Contra Costa County | Permit required | Any size | Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00 minimum."... | |
| Fresno County | Permit required | Any size | Section 2510 Mechanical Code Fees, FY 2026-27: Issuing each permit $42.77 | |
| Los Angeles | Permit required | Any size | ...piece of equipment per LADBS Fee Sch.3 (7/2017), for example a gas furnace at $19... |
Inspections and closing out your permit
In Los Angeles County, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
- In Los Angeles County: rough inspection of the mechanical and gas systems must be made before the work is covered or concealed, before fixtures or appliances are set or installed, and before the framing inspection (IRC R109.1.2).
- In Los Angeles County: where a cooling coil is added to an existing warm air furnace, the rough in confirms the coil is not installed upstream of the heat exchanger unless the furnace is listed for it, and that the blower can handle the added static pressure (IRC M1411.2).
- In Los Angeles County: the rough in and final both confirm the appliance access opening and working space are large enough to service the unit (IRC M1305.1).
- In Los Angeles County: at final inspection, the inspector verifies the equipment has adequate combustion air, with openings kept clear for the distance the code requires (IRC M1402.3).
- In Los Angeles County: final inspection also checks that the condensate line drains to an approved point of disposal with the required slope and does not create a nuisance (IRC M1411.3).
- In Los Angeles County: for a straight equipment changeout with no new ductwork, many permit offices require only a single final inspection, while a new installation still gets a rough in inspection before the final (common local inspection practice).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Los Angeles County permit portal or by phone at 626-458-3173.
Inspection sequence from International Residential Code (IRC), 2021 edition, Section R109 (Required Inspections) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. An open permit left un-inspected can surface later in a title search or home sale.
Your HVAC Permit checklist for Los Angeles County
- Confirm the requirement. Yes, a permit is required. Usually needed: Before installing, altering, relocating, or replacing a furnace, heater, boiler, air conditioner, refrigeration compressor, air handling unit, evaporative cooler (other than portable), ventilation system, or appliance vent.
- Budget the fee. Mechanical Code Fee Schedule (Title 29 of the County of Los Angeles Code, Ord No. 2013-0051), effective July 1, 2026: $41.35 for the issuance of each permit; $40.66 for the installation, alteration or relocation of each refrigeration compressor or absorption unit and for each fuel burning furnace, heater, boiler and vented decorative appliance including vents attached thereto up to and including 100,000 BTU ($78.33 for more than 100,000 up to and including 500,000 BTU, $196.18 above that); $19.30 for each air handling unit up to and including 2,000 CFM for the first 10 units; $6.32 for each air inlet and air outlet served by an air-conditioning system, or $55.71 per 1,000 square feet of conditioned area where the count is unknown; $19.30 for each appliance vent not included in an appliance permit; $40.66 for alteration of an existing duct system. Investigation fee for work done without a required permit is not less than $504.47, reduced to $252.23 for one or two family dwellings when the work is performed by an owner-builder. Official fee schedule.
- Apply. In Los Angeles County, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb. Start at the Los Angeles County permit portal.
- Keep the office details handy. Los Angeles County Public Works, Building and Safety Division. Phone: 626-458-3173. Address: Los Angeles County Public Works, Building and Safety Division, 3rd Floor, 900 S. Fremont Avenue, Alhambra, CA 91803.
- Plan for inspections. In Los Angeles County, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need an HVAC permit in Los Angeles County?
- Los Angeles County requires a mechanical permit for new, expanded, or replaced mechanical items in unincorporated areas. Title 29, Section 111.1 exempts only a narrow list: any portable heating appliance, portable ventilating equipment, portable cooling unit, portable evaporative cooler, steam, hot, or chilled water piping within regulated heating or cooling equipment, replacement of a component part or assembly of an appliance that does not alter its original approval, refrigerating equipment that is part of already-permitted equipment, and any unit refrigerating system. A straightforward residential changeout that needs no plan review can be self-issued online as an Express Mechanical Permit through EPIC-LA, which is issued automatically once fees are paid. Always confirm with the Los Angeles County Public Works, Building and Safety Division before starting.
- How much does an HVAC permit cost in Los Angeles County?
- Mechanical Code Fee Schedule (Title 29 of the County of Los Angeles Code, Ord No. 2013-0051), effective July 1, 2026: $41.35 for the issuance of each permit; $40.66 for the installation, alteration or relocation of each refrigeration compressor or absorption unit and for each fuel burning furnace, heater, boiler and vented decorative appliance including vents attached thereto up to and including 100,000 BTU ($78.33 for more than 100,000 up to and including 500,000 BTU, $196.18 above that); $19.30 for each air handling unit up to and including 2,000 CFM for the first 10 units; $6.32 for each air inlet and air outlet served by an air-conditioning system, or $55.71 per 1,000 square feet of conditioned area where the count is unknown; $19.30 for each appliance vent not included in an appliance permit; $40.66 for alteration of an existing duct system. Investigation fee for work done without a required permit is not less than $504.47, reduced to $252.23 for one or two family dwellings when the work is performed by an owner-builder. See the official fee schedule for current amounts.
- How long does an HVAC permit take in Los Angeles County?
- Express Mechanical Permits are self-issued online: the building permit is automatically issued after all required fees are successfully paid. Times can vary by workload and project scope, so confirm with the office.
- Where do you apply for an HVAC permit in Los Angeles County?
- You can apply through the Los Angeles County permit portal or contact the Los Angeles County Public Works, Building and Safety Division directly. The links are listed on this page.
- Can a homeowner pull an HVAC permit themselves in Los Angeles County?
- Under California law (Business & Professions Code 7044(a)-(b); Business & Professions Code 7031.5): California exempts an owner from contractor licensing under section 7044 when they personally perform all the work on their own property, or any work they do not perform themselves is done by their own employees paid only wages, and none of the improvements are intended or offered for sale. It also exempts an owner who directly contracts with licensed contractors for each trade, as long as no more than four of the single-family residential structures involved are intended or offered for sale in a calendar year; this route does not apply if the owner instead contracts with a general contractor for the construction. A homeowner may also improve their own principal residence without a license, as long as the work is done before any sale, they have actually resided there for the 12 months before completion, and they have not used this exemption on more than two structures more than once in any three-year period. Selling a self-built structure within one year of completion creates a rebuttable presumption that it was built for sale, which defeats the exemption, and selling five or more structures within a year makes that presumption conclusive. Separately, every city or county that requires a permit must also require the applicant to file a signed statement giving their contractor license number or the basis of their claimed exemption; a false or missing statement carries a civil penalty of up to $500. Confirm how Los Angeles County applies this before you apply.
From the Library
What else needs a permit in Los Angeles County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | height of the deck surface above grade; the exemption also requires the deck not to be over any basement or story below and not to be part of an accessible route | ...grade is priced from the valuation-based Table 1-A Building Permit Fees ($65.36 for... |
| Electrical Permit | Permit required | Any size | ...the County of Los Angeles Code, Ord No. 2013-0049), effective July 1, 2026: $41.35... |
| Fence Permit | It depends | height of a fence or freestanding block wall measured from the lowest adjacent grade; a masonry or concrete fence must also be set back from a public way at least a distance equal to its height to stay exempt | ...6 feet is priced from the valuation-based Table 1-A Building Permit Fees: $65.36... |
| Patio Permit | It depends | Before building a patio cover, a carport, an enclosed patio, or any patio work that... | ...enclosure is priced from the valuation-based Table 1-A Building Permit Fees ($65.36... |
| Plumbing Permit | Permit required | Any size | ...28 of the Los Angeles Code, Ord. No. 2013-0050), effective July 1, 2026: $41.35 for... |
| Pool Permit | It depends | depth of a prefabricated pool or other body of water accessory to a one- or two-family (Group R-3) home; the same exemption also reaches pools that do not exceed 5,000 gallons and are installed entirely above adjacent grade | ...is priced from the valuation-based Table 1-A Building Permit Fees plus the $41.35... |
| Roof Replacement Permit | Permit required | Any size | A reroof is priced from the valuation-based Table 1-A Building Permit Fees ($65.36 for a... |
| Shed Permit | It depends | gross floor area of a one-story detached accessory building; the exemption also requires the height not to exceed 12 feet and the maximum roof projection not to exceed 24 inches | ...exemption is priced from the valuation-based Table 1-A Building Permit Fees ($65.36... |
| Solar Permit | Permit required | Any size | ...permit fee for small residential rooftop photovoltaic systems shall not exceed $500... |
HVAC Permit in other California localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Los Angeles County documents; the office above sets the local rules.
How this HVAC permit page for Los Angeles County was verified. 2 official sources: dpw.lacounty.gov, dpw.lacounty.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Los Angeles County Public Works, Building and Safety Division. Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Compare HVAC Permit requirements across California localities