Quick Answer: To get started with an ADU project in San Jose in 2025, follow these 7 steps: (1) Verify your property’s eligibility — check San Jose’s ADU portal (sanjoseca.gov/ADU)

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How to Get Started with an ADU Project in San Jose: 7 Steps for 2025

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Quick Answer: To get started with an ADU project in San Jose in 2025, follow these 7 steps: (1) Verify your property’s eligibility — check San Jose’s ADU portal (sanjoseca.gov/ADU) to confirm your zoning allows an ADU and review your property’s setbacks and lot coverage; (2) Choose your ADU type — detached ADU, garage conversion, attached ADU, or JADU; (3) Select a plan — pre-approved plans from the city (free, faster permit) or custom architectural plans; (4) Hire a licensed ADU contractor or design-build firm — get 3 quotes, verify CSLB license; (5) Begin the permit process — your contractor files the permit application; expect 4-10 weeks for San Jose plan review; (6) Construction begins after permit approval — typically 4-9 months for a complete detached ADU; (7) Final inspection and Certificate of Occupancy — required before the ADU can be occupied or rented.

ADU Project Getting Started Checklist — San Jose 2025

  • Verify property eligibility (zoning, setbacks, lot coverage, utility capacity)
  • Choose ADU type: detached (highest rental value), garage conversion (lowest cost), attached, or JADU
  • Decide between pre-approved plans (faster, cheaper) and custom design (more flexibility)
  • Get 3+ quotes from CSLB-licensed ADU contractors
  • Verify contractor has built ADUs in San Jose specifically (local permit experience matters)
  • Confirm financing: cash, home equity line, ADU-specific construction loan, or HCD ADU grant programs
  • Do NOT break ground before permit is in hand — this is illegal and creates major complications

Quartz Construction is a CSLB-licensed ADU specialist in San Jose — we handle the full process from feasibility through Certificate of Occupancy. Start with a free ADU consultation. CSLB #1003436 | Call (650) 749-7436.

Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA
Home remodeling San Jose CA

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