Do I need a permit for HVAC work in
Los Gatos, California?

Los Gatos HVAC permits — the key details

California Title 24 energy code (Part 6, effective 2022 standards) is the bedrock rule for all HVAC work in Los Gatos. Any installation, replacement, or modification — including a simple furnace swap — triggers a compliance pathway. The California Energy Commission's Title 24 standards require that replacement equipment meet current efficiency minimums: furnaces must achieve AFUE 90% or better, air conditioners SEER2 13 or higher (in coastal 3B zones) or SEER2 15+ (in inland 5B-6B foothill areas). Los Gatos Building Department staff review Title 24 documentation before issuing the permit — meaning you cannot start work until the department confirms your equipment choice and installation plan align with the code. This is different from some neighboring jurisdictions (e.g., Campbell) where staff may issue the permit contingent on Title 24 being submitted post-work. The department's email-based submission process means no true online portal; you compile a PDF package (HERS rater compliance report, equipment spec sheets, site photos, ductwork diagram if applicable) and send it to buildingpermits@losgatosca.gov. Turnaround is typically 2-5 business days for a straightforward furnace replacement, longer if the rater flags missing information.

The Los Gatos municipal code Chapter 14.24 adopts the 2022 California Building Code (CBC) by reference, but with a local amendment emphasizing HVAC ductwork testing and sealing in homes with existing ductwork. If your HVAC contractor is replacing a furnace and reusing ducts (common in retrofit jobs), the city may require ductwork pressure testing (ASTM E1554 or E1555 method) to verify system performance. This test adds 2-4 hours and $300–$600 to the job but is not always triggered — it depends on whether the HVAC plan triggers a 'major HVAC system replacement' (defined as replacement of the distribution system AND the primary heating or cooling unit). A furnace-only swap without new ductwork does not usually require duct testing. However, if you're installing a mini-split heat pump system to supplement or replace a central furnace, Los Gatos staff may ask for performance specs and insulation R-value documentation for new refrigerant lines (minimum R-6 insulation per Title 24). The permit itself carries no specific ductwork rider fee, but the testing (if required) is your contractor's cost, not the city's.

Owner-builders in Los Gatos can pull HVAC permits under California B&P Code § 7044, which allows property owners to do work on their own single-family home without a contractor license. However, this exemption does NOT cover electrical or refrigerant-handling work. If your HVAC system requires a new 240V circuit or a dedicated breaker, you must hire a licensed electrician to pull a separate electrical permit and perform that work. Refrigerant recovery, evacuation, charging, and leak detection are restricted to EPA-certified HVAC technicians (B&P Code § 7551); you cannot legally do this yourself. This means an owner-builder scenario typically involves you pulling the mechanical permit, hiring a licensed HVAC tech for refrigerant work, and hiring a licensed electrician for any new electrical connections — so three separate license categories end up involved. Los Gatos Building Department does NOT offer a discount or streamlined path for owner-builders; the permit fee and Title 24 requirement are identical. If you're considering a DIY approach, you'll end up paying for licensed labor anyway, so the savings are minimal.

Los Gatos sits at the intersection of two very different climate zones: coastal (Santa Cruz Valley floor, Vasona area) rated 3B (cool marine), and inland foothills (near Highway 9, toward Saratoga) rated 5B-6B (warm-dry to cool-mountain). This matters for Title 24 because equipment efficiency minimums vary by zone. A SEER2 13 air conditioner is acceptable in the coastal zone but NOT in the foothills, where SEER2 15 is required. Your HVAC contractor and Title 24 rater must confirm your property's climate zone before spec'ing equipment; the city's Building Department staff will catch a mismatch during the permit review and reject the application. Ductwork insulation and sealing also varies: coastal homes with less extreme temperature swings may qualify for R-4 or R-6 insulation on supply ducts, while foothill homes need R-8. The city does not publish a climate-zone map on its website; you'll need to cross-reference your address with the California Energy Commission's database (available at energy.ca.gov/title24) or ask your HVAC contractor's Title 24 rater to confirm. This geographic split is unique to Los Gatos among Santa Clara County cities because the city boundary straddles both zones.

The permit timeline in Los Gatos typically runs 3-4 weeks from application to inspection-ready status: 2-5 days for initial Title 24 review and checklist, 5-7 days for you and your contractor to address any rejects (equipment spec clarification, ductwork photos, etc.), 2-3 days for final approval and permit issuance, then 3-5 business days for scheduling a rough-in inspection (before any ductwork is sealed). Plan-review time is not 'over-the-counter' (same-day approval for simple projects); every HVAC permit goes through staff review because Title 24 compliance is not self-evident. If you need the work done quickly (e.g., winter heating emergency), notify your contractor and the Building Department upfront; they may prioritize during slower periods, but don't count on it. Inspection fees are included in the permit fee; Los Gatos does not charge separate inspection fees. A typical HVAC permit for a furnace replacement or AC replacement costs $150–$350 depending on job valuation, calculated at roughly 1.5% of the equipment and labor cost (reported by the contractor). If your contractor quotes $8,000 all-in, the permit fee would be around $120; if it's $15,000, the fee is around $225.

Three Los Gatos hvac scenarios

Los Gatos' climate-zone split and why it matters for your equipment choice

Los Gatos straddles two distinct climate zones that most other Santa Clara County cities do not. The western and central portions (around Vasona Reservoir, downtown, Almaden Road) fall into CEC Climate Zone 3B, which is coastal marine: cool, moderate humidity, minimal temperature swings. The eastern foothills (Highway 9, Saratoga border, Los Gatos-Saratoga Road) are Zone 5B-6B, which is warm-dry to cool-mountain: larger seasonal temperature swings, lower humidity, and more aggressive cooling and heating loads. This split determines your Title 24 pathway. If you live in Zone 3B and replace an AC unit, you must meet SEER2 13 (the coastal minimum); if you live in Zone 5B, you must hit SEER2 15. Many HVAC contractors and homeowners are unaware of this boundary, and Los Gatos Building Department staff catch this error during permit review. Submitting an application for a SEER2 13 unit when your address is in the foothills will be rejected with a request to upgrade the equipment. This can delay your project 1-2 weeks if the contractor didn't cross-check the climate zone before ordering equipment.

The climate-zone line does not align with zip codes or obvious geographic markers. Your address is best confirmed by searching the California Energy Commission's Title 24 Climate Zone Database (available at energy.ca.gov, under 'Building Energy Efficiency Standards'). Input your Los Gatos address, and the tool returns your zone. Alternatively, ask your HVAC contractor's Title 24 rater to confirm on your behalf; they use this tool routinely. Some contractors assume all of Los Gatos is Zone 3B and specify coastal-level equipment, only to discover at permit review that the foothills portion requires an upgrade. This is a common resubmission reason. Knowing your zone upfront means the permit application sails through the first review.

Ductwork insulation and sealing also hinge on climate zone. Coastal homes (3B) are allowed R-4 or R-6 insulation on ducts; foothills homes (5B-6B) must use R-8. This matters when pricing ductwork replacement. If you get quotes for duct work without clarifying your climate zone, the contractor might bid R-6 ducts, then have to up-charge when Title 24 review flags the shortfall. Refrigerant line insulation for mini-split systems follows a similar rule: R-6 in coastal zones, R-8 in foothills. Again, clarify this early to avoid bid surprises and permit-review delays.

Title 24 documentation, the email-based permit portal, and why lead times matter

Los Gatos Building Department does not offer a traditional online self-service permit portal for HVAC work. Instead, you or your contractor submit all documentation via email to buildingpermits@losgatosca.gov. This method is slower than, say, a city with instant automated permit issuance, but it has one advantage: a human staff member (usually a plan reviewer) reads your application in sequence and responds with specific feedback within 2-5 business days. The downside is that email can get delayed or buried, and there's no real-time status dashboard. Your contractor should send the application on a Monday or Tuesday morning (not Friday) to maximize review time before the weekend.

Title 24 documentation you'll need to include: (1) HERS Rater Compliance Report or Title 24 Energy Audit (confirming equipment efficiency, ductwork specs, and overall system compliance), (2) Equipment spec sheets (furnace or AC model number, AFUE or SEER2 rating, size in BTU), (3) Ductwork diagram or photos (if ducts are being modified or tested), (4) HVAC installation plan (where equipment will be located, how it connects to ducts or linesets). Most contractors have a template or checklist. If your rater is a third party (not employed by the HVAC company), be sure they know the email address to use; some raters submit directly, others give the report to your contractor. Do not assume the contractor will handle all Title 24 submission; confirm this in writing before work begins. Delays often stem from a contractor saying 'I thought you were submitting it' or a rater submitting to the wrong department email.

Once Los Gatos staff receives your application, they have 10-15 business days (per California code) to either approve or return comments. In practice, straightforward furnace replacements are approved in 3-5 days. Ductwork replacements or mini-splits may take 7-10 days if staff has questions. If there are deficiencies (e.g., missing equipment spec, climate-zone mismatch), staff will email you a resubmission request. You then have up to 2 weeks to resubmit before the application is deemed abandoned. Resubmitting typically takes 2-5 more days. This back-and-forth can stretch a project timeline from 3 weeks to 5-6 weeks if you're not organized. Contractors experienced in Los Gatos know to bundle all Title 24 docs, equipment specs, and ductwork diagrams in a single email, with clear labels ('TITLE 24 REPORT.pdf', 'FURNACE SPEC.pdf', etc.), to minimize re-do cycles.

Common questions