Fees
Estimated city fees
Baseline for a simple permitted adu: $3,000–$9,000+ is a realistic combined permit and trade-fee range for a typical San José ADU, with a major fee break for keeping the unit under 750 sq ft because school and parkland impact fees are waived
| Fee | Amount | Notes |
|---|---|---|
| Building permit and plan review fees | $3,000–$9,000+ (typical combined city permit range) | San José directs applicants to the Building Fee Estimator and Building Fee Schedule because ADU permit fees are size- and valuation-dependent. Detached units and heavier trade scope cost more than simple conversions. |
| School impact fees | $0 for ADUs under 750 sq ft; project-specific at 750+ sq ft | The current San José ADU FAQ says school impact fees do not apply to ADUs less than 750 square feet. For ADUs 750 square feet or larger, check with the school district for your location. |
| Parkland fees | $0 for ADUs under 750 sq ft; project-specific at 750+ sq ft | The current San José ADU FAQ says parkland impact fees do not apply to ADUs less than 750 square feet. For larger units, fee exposure depends on location and current schedules. |
| Other process fees | Varies by site | Geological hazard review, tree removal permits, fire variance review, utility work, and similar process fees may be required depending on the lot and design. |
Affiliate slot
Need a contractor?
Licensed contractor matching — contextual placement.
Conditions
The rules that apply
- San José routes ADU work through the Department of Planning, Building & Code Enforcement. An ADU is a real dwelling-unit permit, not a simple accessory-structure filing.
- The city tells applicants to start with the ADU Universal Checklist to confirm lot eligibility, setback, height, and fire constraints before filing formal permit plans.
- San José's zoning rules sit in Title 20, but the city's own ADU page says the zoning code enacts state ADU legislation and the ADU Universal Checklist reflects state law. In plain English: San José cannot undercut California's ADU preemption framework.
- San José's process explicitly asks applicants to identify whether they are using the City allowance or State allowance option. That city-specific framing is unique versus many other California permit pages.
- San José also offers an ADU Ally service, a preapproved ADU program, and a separate tiny-home-on-wheels pathway. Those programs can materially change cost and review friction if they fit your project.
- The current city FAQ says ADUs under 750 square feet are not subject to school impact fees or parkland fees. That is the main fee-waiver lever San José homeowners should know before finalizing size.
- A JADU remains a different product from a full ADU. San José says JADUs are less than 500 square feet, within the footprint of a single-family home, and follow their own ordinance path.
- Per the city FAQ, ADUs may be rented, and the minimum rental term is 30 days under state law. San José also assigns a separate address to the ADU as part of the permit process.
Documents
What you'll need to file
- ADU Universal Checklist showing the property qualifies for the chosen ADU path and identifying whether the project uses the City allowance or State allowance option.
- Building permit application through SJPermits.org / SJePlans under the Planning, Building & Code Enforcement permit workflow.
- Site plan, floor plans, elevations, and construction details prepared to the city's ADU plan requirements.
- Structural drawings and calculations for foundation, framing, lateral design, and any conversion scope required by the current California Building Code.
- Fire-separation and fire-requirement documentation when required by the city's ADU fire checklists or detached-ADU directive.
- Water-flow / hydrant information and utility documents when the lot or design requires them.
- Title 24 energy documentation for new construction or scope triggering California energy compliance.
- If using a preapproved ADU vendor or tiny-home-on-wheels path, the city-specific packet required for that alternate San José program.
Process
How the permit process works
Sequential — each step gates the next.
-
Complete the San José ADU Universal Checklist San José tells applicants to start here. The checklist is the city's front door for deciding whether the parcel qualifies, what the setback and fire rules are, and whether the project fits the City allowance or State allowance option.
-
Get preliminary zoning feedback if needed For basic questions, San José says you can call the Planning Division or email ZoningQuestions@sanjoseca.gov. For project-specific feedback, the city offers a preliminary planner meeting through the ADU Ally service at the published hourly rate.
-
Prepare the ADU plan set Use the city's ADU plan requirements, detached-ADU fire-separation rules, and inspection checklist to prepare a formal submittal. San José strongly recommends experienced professionals because redesign after submittal is expensive and common.
-
Submit through SJPermits / SJePlans File the ADU package through San José's online permit systems. The permit review runs through the Department of Planning, Building & Code Enforcement and coordinates planning, structural, and trade comments.
-
Respond to corrections and manage fee exposure Correction rounds are normal. This is also the stage where sizing decisions matter: keeping the unit under 750 square feet preserves the school-fee and parkland-fee waiver described in the current city FAQ.
-
Pay fees and pull the permit Once the plan set clears, pay the applicable building, trade, and any extra site-specific fees. If the lot requires hazard, tree, or fire-variance review, those extra costs must be resolved before issuance.
-
Build, inspect, and finalize the new dwelling Complete required inspections and obtain final sign-off. San José says the ADU receives its own address as part of the permit process, which is a practical marker that the unit is being treated as a real legal dwelling.
Affiliate slot
Tools & materials
ADU tools and supplies — Amazon affiliate block.
Provenance
Code basis & official sources
Last verified 2026-04-22.
San José Title 20 Zoning Code, current ADU Universal Checklist / ADU FAQ guidance from the Department of Planning, Building & Code Enforcement, and California state ADU law including AB 68, AB 881, AB 2221, and SB 9.
Residential permit page: https://www.sanjoseca.gov/business/development-services-permit-center/accessory-dwelling-units-adus
If you skip the permit
- San José can stop work and force after-the-fact permitting on an unpermitted ADU project.
- If the unit is 750 square feet or larger, you can trigger school and parkland fee exposure that you could have avoided by designing smaller.
- Late utility surprises — especially metering and service work — can blow up the schedule if ignored during design.
- An unpermitted ADU creates title, insurance, disclosure, and financing problems at resale.
- A noncompliant ADU that assumed local flexibility where state law or fire rules do not actually help will end up in correction cycles, redesign, or demolition scope.
FAQ
Common San Jose adu permit questions
Do I need a permit to build an ADU in San José, CA?
Yes. San José routes ADUs through the Department of Planning, Building & Code Enforcement. This is a full dwelling-unit permit process, not a shed permit.
What is the San José ADU Universal Checklist?
It is the city's starting gate for ADU eligibility. San José tells applicants to use it to confirm whether the lot qualifies, what setback and fire constraints apply, and whether the project is using the City allowance or State allowance option.
Can San José override California ADU law?
No. San José's own ADU page says the city enacts state ADU legislation in its zoning code and the ADU Universal Checklist reflects state law. Local review still matters, but the city cannot undercut California's ADU preemption framework.
What fee waivers apply to San José ADUs?
The current city FAQ says ADUs under 750 square feet are not subject to school impact fees or parkland fees. Once you go to 750 square feet or larger, those fees can come back into play depending on location and district requirements.
Does San José require owner occupancy for an ADU?
Generally no for full ADUs because California state law restricts local owner-occupancy mandates. JADUs are different and can still carry owner-occupancy requirements.
Does an ADU get its own address in San José?
Yes. The current city FAQ says an address is assigned to the ADU as part of the building permit process.
Can I rent a San José ADU?
Yes. The city FAQ says the house and ADU can be rented to different parties, but the minimum rental term is 30 days under state law.
§ A More permits for San Jose
§ B Compare across cities
§ C Companion calculators
Disclaimer: Informational only — not legal advice. Rules change; verify with San Jose permitting staff before you build.