California / Santa Clara County
HVAC Permit in Santa Clara County, California
Permit required
Yes, a permit is required
Before installing or replacing a furnace, air conditioner, heat pump, ductwork or similar mechanical equipment in the unincorporated county.
Issued bySanta Clara County Department of Planning and Development, Development Services (Building Inspection Office)
By Mario Bailey, verified against official sources
Quick answer
The County Mechanical Code is the 2025 California Mechanical Code as amended by Division C9 of the Ordinance Code, readopted by Ordinance No. NS-1100.138 on December 9, 2025. The county rewrote Section 104.5 so that a mechanical plan review fee is paid when plans have to be submitted and a mechanical permit fee is paid once the plans are approved for permit issuance, and it deleted the model code's own permit fee table in favor of fees set by resolution of the Board of Supervisors. Ordinance Code Section C1-67 makes it unlawful to perform work requiring a permit without first obtaining one, so mechanical work in unincorporated Santa Clara County needs a permit from the Building Official. Zoning Ordinance Section 4.20.020.K adds a siting rule: ground-mounted heating, ventilation and air conditioning units must be at least 5 feet from any property line.
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When a permit is usually needed
Before installing or replacing a furnace, air conditioner, heat pump, ductwork or similar mechanical equipment in the unincorporated county.
What an HVAC permit costs in Santa Clara County
How Santa Clara 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 County | 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... |
| Santa Clara Countythis page | Permit required | ...permit fee and the mechanical inspection hourly rate are both... |
How to apply in Santa Clara County
In Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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. Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office) sets the exact checklist for Santa Clara County.
Where to apply in Santa Clara County:
Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office)
- County Government Center, East Wing, 7th Floor, 70 West Hedding Street, San Jose, CA 95110
- Phone: 408-299-5700
HVAC Permit in Santa Clara County compared with nearby California localities
| Locality | Permit needed? | Threshold | What each California schedule says | Verified |
|---|---|---|---|---|
| Santa Clara County | Permit required | Any size | ...mechanical permit fee and the mechanical inspection hourly rate are both... | |
| 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara 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 Santa Clara County permit portal or by phone at 408-299-5700.
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 Santa Clara County
- Confirm the requirement. Yes, a permit is required. Usually needed: Before installing or replacing a furnace, air conditioner, heat pump, ductwork or similar mechanical equipment in the unincorporated county.
- Budget the fee. Under the county's Building Section Services Fee Schedule effective July 1, 2025 the minimum mechanical permit fee and the mechanical inspection hourly rate are both $272.00. Mechanical units, coils, boilers, furnaces, heaters, heat pumps, compressors and similar equipment are $273.80 for 1 to 4 units and $72.00 for each additional unit. A combined flat fee permit covering up to 3 devices total of any mechanical, electrical or plumbing category is $273.80. Adopted by the Board of Supervisors on January 23, 2024.
- Apply. In Santa Clara 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 Santa Clara County permit portal.
- Keep the office details handy. Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office). Phone: 408-299-5700. Address: County Government Center, East Wing, 7th Floor, 70 West Hedding Street, San Jose, CA 95110.
- Plan for inspections. In Santa Clara 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 Santa Clara County?
- The County Mechanical Code is the 2025 California Mechanical Code as amended by Division C9 of the Ordinance Code, readopted by Ordinance No. NS-1100.138 on December 9, 2025. The county rewrote Section 104.5 so that a mechanical plan review fee is paid when plans have to be submitted and a mechanical permit fee is paid once the plans are approved for permit issuance, and it deleted the model code's own permit fee table in favor of fees set by resolution of the Board of Supervisors. Ordinance Code Section C1-67 makes it unlawful to perform work requiring a permit without first obtaining one, so mechanical work in unincorporated Santa Clara County needs a permit from the Building Official. Zoning Ordinance Section 4.20.020.K adds a siting rule: ground-mounted heating, ventilation and air conditioning units must be at least 5 feet from any property line. Always confirm with the Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office) before starting.
- How much does an HVAC permit cost in Santa Clara County?
- Under the county's Building Section Services Fee Schedule effective July 1, 2025 the minimum mechanical permit fee and the mechanical inspection hourly rate are both $272.00. Mechanical units, coils, boilers, furnaces, heaters, heat pumps, compressors and similar equipment are $273.80 for 1 to 4 units and $72.00 for each additional unit. A combined flat fee permit covering up to 3 devices total of any mechanical, electrical or plumbing category is $273.80. Adopted by the Board of Supervisors on January 23, 2024. Contact the office for current amounts.
- Where do you apply for an HVAC permit in Santa Clara County?
- You can apply through the Santa Clara County permit portal or contact the Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office) directly. The links are listed on this page.
- Can a homeowner pull an HVAC permit themselves in Santa Clara 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 Santa Clara County applies this before you apply.
From the Library
What else needs a permit in Santa Clara 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 | deck area, paired with a 30-inch height limit, no attachment to the dwelling, and no required exit door served | Decks are charged by valuation, not by a flat fee |
| Electrical Permit | Permit required | Any size | ...Schedule effective July 1, 2025 the electrical inspection hourly rate is... |
| Fence Permit | It depends | fence height at which the County Residential Code permit exemption stops applying | ...Valuation-Based Fee Schedule, effective July 1, 2025, which begins at a $249.00... |
| Patio Permit | It depends | Before building a patio cover, trellis, carport or similar roofed structure over a patio | No patio-specific flat fee is published |
| Plumbing Permit | Permit required | Any size | ...plumbing permit fee and the plumbing inspection hourly rate are both $272.00, and a... |
| Pool Permit | It depends | depth of a prefabricated swimming pool | The county charges single-family residential swimming pools as flat fees |
| Roof Replacement Permit | Permit required | Any size | ...the county's Building Section Services Fee Schedule effective July 1, 2025: $479.20... |
| Shed Permit | It depends | floor area of a one-story detached tool or storage shed | No shed-specific flat fee is published |
| Solar Permit | Permit required | Any size | ...the fee package the Board adopted on April 17, 2018, lists those amounts as $375.35... |
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 Santa Clara County documents; the office above sets the local rules.
How this HVAC permit page for Santa Clara County was verified. 2 official sources: plandev.santaclaracounty.gov, library.municode.com. Last checked by Mario Bailey, not confirmed with Santa Clara County Department of Planning and Development, Development Services (Building Inspection Office). Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Compare HVAC Permit requirements across California localities