What does getPermit actually do?

getPermit reads your job details and tells you what a California city expects before you file: which permits the work triggers, the documents and plans you'll need, the fees to budget for, and the common reasons applications in that jurisdiction get bounced back. It produces a clear checklist you can act on. It does not submit to the city for you — you (or your permit person) stay in control of what gets filed.

Is there a human involved, or is it just AI?

Both. The AI does the research and drafts the assessment and checklist; an experienced permit coordinator reviews and approves it before it's treated as authoritative. The human check is the point — it's how we keep it trustworthy in a process where a wrong filing has real consequences.

Which cities do you cover?

We're starting deep in California rather than shallow everywhere. For a city we haven't fully mapped yet, we'll give you accurate general California guidance and point you to that city's official building department — and you can join the waitlist to be notified when we cover it in depth. We will not invent city-specific fees or timelines we haven't verified.

Solo electricians, plumbers, and HVAC contractors, and small general contractors who don't have a dedicated permit department and lose billable hours to permit admin.

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Furnace replacement permits in Tustin, CA

General California guidance last updated August 2, 2026 · Tustin data fully re-verified September 13, 2026

What HVAC contractors need to know about pulling a furnace replacement permit in Tustin (Orange County).

Short answer

In California, replacing a furnace — even like-for-like — requires a mechanical permit because the work involves gas piping, venting, combustion air, and electrical connections. It is governed by the California Mechanical Code (Title 24, Part 4), and the changeout triggers Energy Code (Title 24, Part 6) alteration measures — commonly duct sealing verified by a third-party HERS rater. A C-20 (HVAC) licensed contractor generally pulls it.

Tustin accepts submittal through the Citizen Self Service (CSS) Portal and has adopted the 2025 California Building Standards Code (with Tustin amendments). Fee details and sources are below.

Tustin permit data

Sourced from public City of Tustin documents — every field carries the source URL and verification date.

Permit portal

Citizen Self Service (CSS) Portal

verified Sep 13, 2026 · source · Plans and completed permit applications are submitted through the CSS Portal; submittal questions go to PlanPermitSubmittals@tustinca.org and solar questions to PVSubmittals@tustinca.org. The city collects permit payments only through the CSS Portal or in person at the City Hall Finance counter, and never asks for a bank routing or wire number

Adopted code edition

2025 California Building Standards Code (with Tustin amendments)

verified Sep 13, 2026 · source · Tustin City Code Sec. 8100 adopts by reference the 2025 California Building, Residential, Electrical, Mechanical, Plumbing, Energy, Wildland-Urban Interface, Historical Building, Fire, Existing Building, Green Building Standards, and Referenced Standards Codes, subject to the local amendments in Article 8, Chapter 1 — enacted by Ordinance No. 1569, adopted November 18, 2025

Fee schedule

FY 2026-2027 Comprehensive Fee Schedule — effective April 1, 2026 (City Council Resolution No. 26-05, January 20, 2026); building fees under Building Division Fees

verified Sep 13, 2026 · source · The Comprehensive Schedule of Fees page lists the schedule as adopted January 20, 2026 with an effective date of April 1, 2026; the PDF cover reads "Approved by City Council Resolution No. 26-05 on January 20, 2026" and "Effective April 1, 2026"

City of Tustin Community Development — Building Division →All verified Tustin data →

The general picture in California

A furnace changeout is permitted mechanical work in every California jurisdiction, like-for-like or not: the job touches gas piping, flue venting, combustion air, and line-voltage wiring, all of which the California Mechanical Code (Title 24, Part 4) puts under permit and inspection. The distinctly Californian wrinkle is the Energy Code — replacing the furnace makes the job an alteration under Title 24, Part 6, which in most climate zones requires sealing the existing ductwork and having a third-party HERS rater verify duct leakage, with the compliance forms registered before final. Condensing (90%+) furnaces also re-route venting from the chimney to sidewall PVC and add a condensate-disposal requirement, which is where shared-chimney and orphaned-water-heater problems surface. Fees, whether the city wants a rough inspection, and how finals are scheduled are set per city — confirm with the local building department.

For deeper background that isn't Tustin-specific, see the statewide furnace replacement guide.

Typically needs a permit

Furnace replacement itself triggers a permit in nearly every California jurisdiction, Tustin included. Tustin-specific variations are confirmed with the issuing department above.

Usually doesn't (general norm)

Filter changes, cleaning, and seasonal service
Like-for-like thermostat replacement on existing low-voltage wiring (smart-thermostat swaps are usually treated the same — verify locally)
Replacing an igniter, control board, blower motor, or other components within the existing unit

Documents & plans generally required

Mechanical permit application (plus electrical scope where a circuit is added or changed)
Contractor license and city business registration
Manufacturer cut sheet for the new furnace (input BTU, AFUE, listing)
Venting detail — flue type, size, and termination; condensing furnaces add PVC vent routing and condensate disposal
Gas-line sizing when the input BTU increases or piping is modified
Energy-compliance form (CF1R-ALT) and HERS registration where duct sealing/testing is triggered
Combustion-air detail for closet or interior installations

Common reasons furnace replacement applications get bounced

Code-rooted patterns across California — not a Tustin-specific rejection rate.

Missing energy paperwork — a furnace changeout is an alteration under Title 24, Part 6, and in most climate zones that means duct sealing with third-party HERS leakage verification; applications without the CF1R/HERS registration bounce
Venting a high-efficiency condensing furnace into an existing B-vent or unlined masonry chimney
An orphaned water heater left on an oversized shared chimney after the furnace moves to sidewall venting
Combustion air not addressed for closet or alcove installations
Gas line undersized for the new unit's input BTU
No condensate-disposal detail for condensing furnaces

The inspection sequence

A typical order — the number of stops and exact sequence vary by jurisdiction and scope.

1Gas pressure test when gas piping is new or modified
2Rough inspection if venting, ducting, or wiring is concealed before cover
3Final inspection with the furnace installed, vented, and operating — HERS duct-test results registered where required

Licensing — who can pull it

Furnace replacement in California is generally performed by a C-20 (Warm-Air Heating, Ventilating and Air-Conditioning) licensed contractor. A C-36 (Plumbing) contractor may handle gas-line work and a C-10 (Electrical) the circuit; a B (General Building) contractor may pull within a larger remodel under CSLB rules. The contractor doing the work typically pulls the permit.

Other verified Tustin notes

Building Division: 714-573-3130 · tustinbuilding@tustinca.org. Counter hours: Monday–Thursday 7:30 a.m.–5:30 p.m., Friday 8 a.m.–5 p.m.
verified Sep 13, 2026 · source
Inspection requests are submitted through the CSS Portal 24 hours a day; requests received by 3:00 p.m. are performed the following workday. For an inspection timeframe, call the inspector between 7:30 and 8:00 a.m. on the day of the inspection.
verified Sep 13, 2026 · source
Contractors and other businesses based outside Tustin that conduct activity in the city must obtain a City of Tustin Business License, which can be applied for online at any time.
verified Sep 13, 2026 · source
Plan check by appointment for minor projects (patio covers, fences and free-standing block walls, pools and spas, kitchen and bathroom remodels), one hour maximum: email plans to planpermitsubmittals@tustinca.org at least 24 hours before the requested date with the subject "Plan Check by Appointment".
verified Sep 13, 2026 · source
The city estimates first-submittal plan check at approximately 10 working days and resubmittals at five working days, unless a special zoning or other approval is required; expedited plan check is available for a slightly higher fee.
verified Sep 13, 2026 · source
SolarAPP+: residential roof-mounted PV projects that meet the SolarAPP+ eligibility list can get automated plan review (plans submitted by a pre-approved contractor; SolarAPP+ charges a processing fee), then apply for the city's Electrical Photovoltaic (SolarAPP) permit in the CSS Portal. Properties in the Cultural Resource District or listed in the Historic Resource Survey are not eligible.
verified Sep 13, 2026 · source

Frequently asked questions

Do I need a permit for a like-for-like furnace changeout?

Generally yes. Every California jurisdiction treats a furnace replacement as permitted mechanical work — it touches gas, venting, combustion air, and electrical, and it triggers Energy Code alteration measures. Fees and process are set by each city; confirm with the local building department.

What does the Energy Code add to a furnace swap?

Replacing a furnace (or coil/air handler) is an 'alteration' under Title 24, Part 6. In most California climate zones that means sealing the existing ducts and having a third-party HERS rater verify the leakage, then registering the compliance forms. Some scopes and climate zones are exempt — the CF1R-ALT form is where that gets determined, and skipping it is the single most common correction on changeouts.

Can I vent the new furnace into the old chimney?

Only if the flue is properly sized and lined for the new appliance. A related trap: when a furnace that shared a chimney with a water heater moves to sidewall venting, the water heater is left 'orphaned' on a flue that is now oversized and often non-compliant — inspectors catch this regularly.

Does switching to a heat pump change the permit?

Yes — a furnace-to-heat-pump conversion adds electrical scope (a dedicated circuit, often a load calculation, sometimes a panel question) and removes the gas scope. It is still a mechanical permit plus electrical, and the Energy Code paperwork applies. Many California cities are streamlining heat-pump changeout permits; confirm the current process locally.

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