Duct replacement permits in Pasadena, CA
General California guidance last updated September 23, 2026 · Pasadena data fully re-verified
What HVAC contractors need to know about pulling a duct replacement permit in Pasadena (Los Angeles County).
Short answer
In California, replacing or extending ductwork requires a mechanical permit, and the Energy Code (Title 24, Part 6) treats it as an alteration: replacing a duct system entirely — or adding/replacing more than about 40 linear feet in unconditioned space — generally triggers duct sealing with third-party HERS leakage testing. Ducts must meet the insulation R-value for the climate zone. A C-20 (HVAC) licensed contractor generally pulls it.
Pasadena accepts submittal through the Pasadena Citizen Self Service (EnerGov) and has adopted the 2025 California Building Standards Code (with Pasadena amendments). Fee details and sources are below.
Pasadena permit data
Sourced from public City of Pasadena documents — every field carries the source URL and verification date.
- Permit portal
- Pasadena Citizen Self Service (EnerGov)
verified Sep 13, 2026 · source · Stable city shortlink; resolves to https://mypermits.cityofpasadena.net/EnerGov_Prod/SelfService, which sits behind a Cloudflare browser check
- Adopted code edition
2025 California Building Standards Code (with Pasadena amendments)
verified Sep 13, 2026 · source · Ordinance No. 7461 adopts the 2025 California Building Standards Code with local amendments, and the city's codes page lists the 2025 California Building Codes as effective January 1, 2026. The same page lists "Eaton Fire Rebuild Building Codes (Optional)", and the ordinance keeps the 2022 local amendments applicable to projects qualifying under Executive Order N-29-25 — https://www.cityofpasadena.net/planning/permit-center/codes-and-regulations/
The general picture in California
Ductwork replacement is permitted mechanical work across California, and the review is mostly an Energy Code review. Title 24, Part 6 treats duct work as an alteration: replace the system, or add or replace more than about 40 linear feet in unconditioned space, and duct sealing with third-party HERS leakage verification generally follows — documented on a CF1R-ALT and registered before final. The materials layer is simple but strictly checked: insulation at the climate zone's required R-value (R-6 or R-8 in most cases), joints sealed with mastic or listed UL 181 tape — never cloth-backed duct tape — and flex duct supported so it isn't kinked or compressed. Because the HERS rater is independent, the schedule needs their test and registration between substantial completion and final inspection. Fees, forms, and inspection scheduling are set per city — confirm with the local building department.
For deeper background that isn't Pasadena-specific, see the statewide duct replacement guide.
Typically needs a permit
Duct replacement itself triggers a permit in nearly every California jurisdiction, Pasadena included. Pasadena-specific variations are confirmed with the issuing department above.
Usually doesn't (general norm)
- Maintenance sealing of accessible duct joints (verify locally)
- Replacing registers and grilles
- Repairing insulation on existing ducts
Documents & plans generally required
- Mechanical permit application
- Contractor license and city business registration
- Duct layout with sizes, materials, and the equipment served
- Insulation R-value spec meeting the climate zone (commonly R-6 or R-8)
- Energy-compliance form (CF1R-ALT) and HERS registration where testing is triggered
- Support/hanger spacing and connection method for flex duct
Common reasons duct replacement applications get bounced
Code-rooted patterns across California — not a Pasadena-specific rejection rate.
- Missing CF1R-ALT or HERS registration when the scope triggers duct testing
- Insulation R-value below the climate-zone requirement
- Cloth-backed duct tape as the sealing method — sealing must be mastic or listed (UL 181) tape
- Leakage over the allowed percentage at the HERS test
- Flex duct unsupported, kinked, or compressed to the point of choking airflow
- Scope written as a 'repair' when most of the system is being replaced
The inspection sequence
A typical order — the number of stops and exact sequence vary by jurisdiction and scope.
- 1Rough inspection where ducts are concealed in framing before cover
- 2Final inspection with the system complete and the HERS duct-leakage results registered where required
Licensing — who can pull it
Duct replacement in California is generally C-20 (HVAC) licensed work; a B (General Building) contractor may pull within a larger remodel under CSLB rules. The HERS duct test is performed by an independent third-party rater, not the installing contractor.
Other verified Pasadena notes
Permit Center hours: Monday–Thursday and alternate Fridays, 8:30 a.m.–3 p.m. Questions on permits or inspections: (626) 744-4200 or permit_center_manager@cityofpasadena.net.
verified Sep 13, 2026 · source
Contractors must present a valid contractor license, verified through the California Contractors State License Board, and a current City of Pasadena business license, and must carry workers' compensation insurance.
verified Sep 13, 2026 · source
Inspections are scheduled online with call, text, or email confirmation of the inspection window, and permit applications can be tracked online.
verified Sep 13, 2026 · source
The Express Permit Portal issues mechanical, electrical, and plumbing permits within minutes, and plan check submittals are reviewed by all required plan reviewers at the same time.
verified Sep 13, 2026 · source
Frequently asked questions
Does a duct repair need a permit?
Small like-for-like repairs are often treated as maintenance, but replacement and extension are permitted mechanical work — and once the altered footage in unconditioned space passes roughly 40 linear feet, the Energy Code's sealing-and-testing requirements generally come with it. Describe the real scope; cities notice 'repairs' that replace half a system.
What leakage does the HERS test allow?
The allowed leakage is a percentage of system airflow set by the Energy Code, and it differs for new, entirely replaced, and altered duct systems. The practical version: mastic at every joint, tested by an independent HERS rater, results registered — an unregistered test doesn't close the permit.
What R-value do ducts need?
Title 24 sets duct insulation by climate zone — commonly R-6 or R-8 for ducts in unconditioned space, with R-8 required in many zones. The CF1R-ALT documents the value for the project's zone, and both the inspector and the HERS rater look at the duct label.
Do I need a separate permit if I'm also replacing the furnace or AC?
Usually one mechanical permit covers both scopes, but the energy paperwork compounds — the equipment changeout triggers its own measures and the duct replacement its own. The trap is pulling an equipment-only permit and 'discovering' the duct replacement at final.
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