California / Contra Costa County
HVAC Permit in Contra Costa County, California
Permit required
Yes, a permit is required
Before installing or replacing a furnace, an air conditioner, or any other mechanical equipment regulated by the California Mechanical Code, including a like-for-like replacement of existing equipment.
Issued byContra Costa County Department of Conservation and Development, Building Inspection Division
By Mario Bailey, verified against official sources
Quick answer
Contra Costa County requires a building permit to install a new residential air conditioning unit and to replace an existing one, and a permit to replace an existing furnace, in both cases obtained before installation. The county states that no planning permit is required for an air conditioning unit, only the building permit. The Land Development Fee Schedule reinforces the rule from the fee side: a mechanical permit is required for all mechanical work regulated by the Mechanical Code, though where the mechanical work is performed alongside a building permit the fee may be added to that permit and no separate mechanical permit is required.
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When a permit is usually needed
Before installing or replacing a furnace, an air conditioner, or any other mechanical equipment regulated by the California Mechanical Code, including a like-for-like replacement of existing equipment.
What an HVAC permit costs in Contra Costa County
How Contra Costa 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 Countythis page | 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... |
| Riverside County | Permit required | Residential Mechanical (BME-RMEC): $274.30 fixed fee, per Appendix A to... |
How to apply in Contra Costa County
In Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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. Contra Costa County Department of Conservation and Development, Building Inspection Division sets the exact checklist for Contra Costa County.
Where to apply in Contra Costa County:
Contra Costa County Department of Conservation and Development, Building Inspection Division
- Application and Permit Center, 30 Muir Road, Martinez, CA 94553
- Phone: 925-655-2700
- Email: permits@dcd.cccounty.us
HVAC Permit in Contra Costa County compared with nearby California localities
| Locality | Permit needed? | Threshold | What each California schedule says | Verified |
|---|---|---|---|---|
| Contra Costa County | Permit required | Any size | Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00 minimum."... | |
| Alameda County | Permit required | Any size | ...of a building permit scope, 'Mechanical Permit 18% of Building Permit Fees, $140.00... | |
| 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... | |
| Los Angeles County | Permit required | Any size | ...the County of Los Angeles Code, Ord No. 2013-0051), effective July 1, 2026: $41.35... |
Inspections and closing out your permit
In Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa 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 Contra Costa County permit portal or by phone at 925-655-2700.
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 Contra Costa County
- Confirm the requirement. Yes, a permit is required. Usually needed: Before installing or replacing a furnace, an air conditioner, or any other mechanical equipment regulated by the California Mechanical Code, including a like-for-like replacement of existing equipment.
- Budget the fee. Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00 minimum." Fees for mechanical work not covered by the new dwelling, addition or alteration, new commercial, shell, or tenant improvement tiers are calculated from the S-002 A.1 Building Permit valuation table, which starts at $75.00 for improvement value up to $2,000 plus $13.75 for each additional $1,000. Mechanical fees for an addition or alteration to a dwelling unit start at $75.00 for improvement value up to $25,000. Fee schedule adopted May 24, 2022, effective August 10, 2022. Official fee schedule.
- Apply. In Contra Costa 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 Contra Costa County permit portal.
- Keep the office details handy. Contra Costa County Department of Conservation and Development, Building Inspection Division. Phone: 925-655-2700. Address: Application and Permit Center, 30 Muir Road, Martinez, CA 94553.
- Plan for inspections. In Contra Costa 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 Contra Costa County?
- Contra Costa County requires a building permit to install a new residential air conditioning unit and to replace an existing one, and a permit to replace an existing furnace, in both cases obtained before installation. The county states that no planning permit is required for an air conditioning unit, only the building permit. The Land Development Fee Schedule reinforces the rule from the fee side: a mechanical permit is required for all mechanical work regulated by the Mechanical Code, though where the mechanical work is performed alongside a building permit the fee may be added to that permit and no separate mechanical permit is required. Always confirm with the Contra Costa County Department of Conservation and Development, Building Inspection Division before starting.
- How much does an HVAC permit cost in Contra Costa County?
- Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00 minimum." Fees for mechanical work not covered by the new dwelling, addition or alteration, new commercial, shell, or tenant improvement tiers are calculated from the S-002 A.1 Building Permit valuation table, which starts at $75.00 for improvement value up to $2,000 plus $13.75 for each additional $1,000. Mechanical fees for an addition or alteration to a dwelling unit start at $75.00 for improvement value up to $25,000. Fee schedule adopted May 24, 2022, effective August 10, 2022. See the official fee schedule for current amounts.
- Where do you apply for an HVAC permit in Contra Costa County?
- You can apply through the Contra Costa County permit portal or contact the Contra Costa County Department of Conservation and Development, Building Inspection Division directly. The links are listed on this page.
- Can a homeowner pull an HVAC permit themselves in Contra Costa 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 Contra Costa County applies this before you apply.
From the Library
What else needs a permit in Contra Costa 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 | area of a deck that is also no more than 30 inches above grade at any point, is not attached to a dwelling, and does not serve a code-required exit door | No deck-specific flat fee is published |
| Electrical Permit | Permit required | Any size | Land Development Fee Schedule S-002 C.6, "Electrical Permit (Other) $75.00 minimum."... |
| Fence Permit | It depends | height of a fence, with concrete and masonry walls treated as walls rather than fences | ..."Fences Greater than 7ft": Building Permit / Inspection, chain-link or wood $116.00... |
| Patio Permit | It depends | roof area of a trellis, arbor, or pergola accessory to a residence, treated by the county as a one-story detached accessory structure | ...cover (includes pre-fab types, usually with ICBO research listing)" at $25.73 per... |
| Plumbing Permit | Permit required | Any size | Land Development Fee Schedule S-002 E.6, "Plumbing Permit (Other) $75.00 minimum."... |
| Pool Permit | It depends | depth of a prefabricated pool accessory to a one or two family dwelling that is installed entirely above ground and holds no more than 5,000 gallons | The Building Valuation Data Supplement sets a "Swimming pool, lump sum of: $39,514.98"... |
| Roof Replacement Permit | Permit required | Any size | ...Schedule item 14, "Re-Roofs - Residential": Building Permit / Inspection $150.00... |
| Shed Permit | It depends | floor area of a one-story detached accessory structure | No shed-specific flat fee is published |
| Solar Permit | Permit required | Any size | ...mount," photovoltaic systems 15 kW or less: Building Permit/inspection $86.00 per... |
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 Contra Costa County documents; the office above sets the local rules.
How this HVAC permit page for Contra Costa County was verified. 2 official sources: contracosta.ca.gov, contracosta.ca.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Contra Costa County Department of Conservation and Development, Building Inspection 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