Apex Homes is San Jose’s full-service ADU builder: managing design, permits, and construction from start to finish. We specialize in pre-approved ADU plans that move through San Jose’s permitting process faster, so most homeowners break ground within 60 days of their first consultation. Whether you’re adding a rental unit, housing for family, or a long-term investment, we handle every step so you don’t have to.
San Jose ADU Regulations
The City of San José allows ADUs on both R-1 and R-2 properties, but the rules differ slightly. Apex Homes confirms your property’s eligibility and maximizes your build potential within these rules before any money changes hands.
- Single-family lots (R-1): One detached or attached ADU + one Junior ADU (JADU). Detached/attached ADUs up to 1,200 sq ft on lots over 9,000 sq ft, or 1,000 sq ft on smaller lots. JADUs capped at 500 sq ft.
Setbacks are straightforward: one-story ADUs may be built with a zero-foot setback, while two-story ADUs require at least four feet. Detached units may be up to 25 feet tall and two stories, with at least six feet of separation from the main home.
- Multi-family lots (R-2): One detached or attached ADU is allowed, following the same size rules as single-family lots. The same setback, height, and separation requirements apply.
Apex Homes handles zoning verification, setback calculations, and code compliance — included in your free feasibility study.
Build Your ADU in San Jose
Start with ParcelZ. Enter your address and get instant eligibility, your buildable area, and matching floor plans. Free, no signup, under 60 seconds. Then our team takes it from there.
The San Jose ADU Permitting Process
San Jose’s permitting process is one of the more streamlined in Silicon Valley — especially with pre-approved plans. Apex Homes manages the entire workflow, so you never need to visit City Hall.
Free Feasibility Study
Apex checks your zoning, lot size, setbacks, and utility connections — at no cost, before you commit to anything.
Select a Pre-Approved Plan
Choose from 8 San Jose-approved ADU layouts. No design review required — permits move faster and cost less.
Apex Submits Your Permit Package
We prepare and submit all site-specific documents (plot plans, structural details, Title 24) to the San José Permit Center.
Permit Issued
Typically 2–4 weeks with a pre-approved plan. Apex manages all city follow-up and responds to any plan-check comments.
Construction & Inspections
Apex builds your ADU and manages all city inspections. We deliver a finished, move-in ready unit — typically within 5 months of your feasibility study.
Pre-Approved ADU Plans in San Jose
San José maintains a library of pre-approved ADU floor plans that have already been reviewed for zoning and building code compliance. When combined with accurate site-specific documents, these plans enable expedited permitting, often within one week.
At Apex Homes, we offer six pre-approved layouts in San José, ranging from one-bedroom cottages to larger three-bedroom designs.
Does a plan fit your lot?
Use ParcelZ to instantly see which of these plans fit your San Jose property — free, no signup.
Why Build an ADU in San Jose?
San José, the heart of Silicon Valley, offers some of the strongest demand for rental housing in California. A well-built ADU here can generate $2,000 to $3,500 per month in rental income, depending on size, layout, and amenities. For many homeowners, that means extra cash flow to offset mortgage payments or increase monthly savings.
Adding a legal ADU doesn’t just bring income, it also boosts property value. In San José, homes with ADUs typically see a 20–30 percent increase in resale value, making them an attractive long-term investment.
Beyond the financial returns, ADUs also create flexibility for family living. They provide private, independent space for aging parents, adult children moving back home, or live-in caregivers. Many San José homeowners also use ADUs as home offices, creative studios, or comfortable guest quarters.
For more detailed information or specific guidance, we can book a free consultation with an Apex Home ADU expert. Let us help you transform your property with a thoughtfully planned ADU today!
Have questions? Contact Apex Homes Today
Our team knows San Jose’s zoning, permits, and pricing inside out. Call us for a free, no-pressure conversation about your property. We’ll tell you exactly what’s possible.