ADU (Accessory Dwelling Unit) Permit in San Jose (2026)
ADU (Accessory Dwelling Unit) permit requirements, fees, and process for San Jose, CA. Find out if you need a permit and how to apply.
Yes, a ADU (Accessory Dwelling Unit) permit is required in San Jose, CA.
A ADU (Accessory Dwelling Unit) permit is required in San Jose, CA. The San Jose Department of Planning, Building and Code Enforcement (PBCE) — Building Division handles permit applications for San Jose. Below you will find the current thresholds, fees, and process for obtaining a adu (accessory dwelling unit) permit in San Jose.
When Is a Permit Required?
When a ADU (Accessory Dwelling Unit) Permit Is Required in San Jose: All ADUs and JADUs require building permit
Permit Fees
ADU (Accessory Dwelling Unit) Permit Fees in San Jose: $2,500–$8,500 typical total. Estimated timeline: 3-6 weeks plan check.
Estimated timeline: 3-6 weeks plan check
How to Get a ADU (Accessory Dwelling Unit) Permit in San Jose
Verify whether your project meets the permit threshold in San Jose: All ADUs and JADUs require building permit.
Prepare your permit application and plans. Contact the San Jose Department of Planning, Building and Code Enforcement (PBCE) — Building Division at https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/building for required documentation.
Submit your application online at https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/building/online-permit-services or in person at the San Jose Department of Planning, Building and Code Enforcement (PBCE) — Building Division.
Pay the permit fee: $2,500–$8,500 typical total.
Wait for plan check approval. Estimated timeline: 3-6 weeks plan check.
Schedule required inspections through https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/building/inspections. All inspections must pass before project is finalized.
Important: State law mandates ministerial approval within 60 days. San Jose PBCE ADU resources: https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/building/residential/adu. SolarAPP+ available for solar permits.
Additional Requirements
- Separate utility connections may be required
- Fire sprinkler requirements based on project scope
San Jose Department of Planning, Building and Code Enforcement (PBCE) — Building Division
Phone: (408) 535-3555
Online Permits: https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/building/online-permit-services
Hours: Mon-Fri 7:30am-4:30pm (public counter); online permit applications 24/7
Frequently Asked Questions
Can I build an ADU in my backyard in San Jose?
Yes. California state law requires San Jose to permit ADUs by-right on all residential lots. You can build a detached ADU up to 1,200 sqft, or a Junior ADU (JADU) up to 500 sqft within your existing home. No owner-occupancy requirement applies. San Jose is one of the most ADU-active cities in California due to its housing shortage. Permits are processed ministerially within 60 days.
What are San Jose's short-term rental rules?
San Jose requires short-term rental registration ($200/year) for all rentals under 30 days. Your property must be your primary residence. Transient Occupancy Tax (10%) applies to all short-term rental income. Register with San Jose Finance Department before listing on any platform. Airbnb collects and remits TOT on behalf of qualifying hosts.
What zoning is needed for a single-family home in San Jose?
Most single-family homes in San Jose are in R-1-6 (6,000 sqft minimum lot) or R-1-8 (8,000 sqft minimum lot) zones. These zones allow one primary dwelling plus ADUs per state law. Front setback is 20 ft, side yards 5 ft, and rear yard 20 ft. Building height is limited to 30 ft (2 stories). Check your specific zone at the San Jose GIS Portal: gisportal.sanjoseca.gov.
Do I need a permit to run a business from my home in San Jose?
Yes. A Home Occupation Permit ($200) is required for any business operated from a San Jose residence. Restrictions include: no clients on-site, no non-resident employees, no exterior signs. Business use must be incidental to residential use. Silicon Valley's startup culture makes home occupation permits very common in San Jose.
Are solar panels required on new homes in San Jose?
Yes. California's Title 24 Energy Code requires solar PV on all new low-rise residential construction. San Jose has one of the highest solar adoption rates in the US. PG&E net metering is available under NEM 3.0. SolarAPP+ provides expedited permits for standard residential systems. San Jose's 300+ sunny days per year make solar highly cost-effective.
What are San Jose's ADU setback requirements?
New detached ADUs in San Jose require 4-foot side and rear setbacks per California state law (Gov Code 65852.2). No setback is required for an ADU that replaces an existing structure in the same footprint (e.g., garage conversion). Front setbacks follow the applicable zone standards — typically 20 ft for R-1 zones. No minimum ADU lot size requirement.
How do I find the zoning for my property in San Jose?
Use the San Jose GIS Portal at gisportal.sanjoseca.gov to look up your parcel's zone designation, overlay districts, and development standards. You can also call San Jose PBCE at (408) 535-3555 or visit the public counter at 200 E. Santa Clara Street for zoning verification.
Source: San Jose Building Code — ADU (Accessory Dwelling Unit) Requirements. Last verified April 5, 2026. View source