FOR HOMEOWNERS
California ADU Permit Guide: What Every Homeowner Needs to Know
Before you build a backyard office, you want to know if the numbers actually work. Here's an honest breakdown of what it costs
Apr 22, 2026
8 min read
01
BACKYARD OFFICE
Apr 15 · 5 min
California made ADU permitting significantly easier in 2020. Here’s what’s changed, what you actually need, and how long the process realistically takes today.
What Changed in California After 2020
AB 68, AB 881, and SB 13 overhauled California’s ADU rules. Owner-occupancy requirements removed. Setback rules relaxed to 4 feet. Fees reduced — no impact fees on ADUs under 750 sqft. Permit timelines mandated at 60 days. Many cities now offer pre-approved plans with 21–30 day processing.
What You’ll Need to Submit
A standard ADU permit application includes: site plan, floor plan and elevations, utility plan, Title 24 energy compliance, and structural calculations. Factory-built units from certified manufacturers (like Kasita) typically come with most documentation pre-completed.
Zoning: Does Your Lot Qualify?
Under current California law, ADUs are permitted by right on any lot with a single-family or multi-family residence. Key factors: setbacks (4 feet rear/side), height limits (16 feet for detached ADUs), and parking (not required within half-mile of transit).
Realistic Timelines
Pre-approved city plans: 21–30 days. Standard application: 30–60 days. Complex lots or older infrastructure: 60–120 days. These are permit timelines only — delivery and installation adds 2–6 weeks for a prefab unit.
FOR HOMEOWNERS
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USE CASES
Three reasons people add
a Kasita to their property.
Most customers come to us for one of these three things. Do any of these sound like you?
FOR HOMEOWNERS
Is a Backyard Office Worth It?
A Cost vs. Benefit Breakdown
Before you build a backyard office, you want to know if the numbers actually work. Here's an honest breakdown of what it costs
$1,800–$3,200/mo potential
FOR FAMILIES
From Booking to Move-In:
The 60-Day Kasita Timeline
60 days is achievable. Here is every phase from first site visit to move-in day — including where delays happen and how to avoid them.
From $22,000, no second mortgage
FOR REMOTE WORKERS
How Much Can You Earn Renting
a Backyard ADU in California?
The income potential from a backyard ADU varies by market, unit type, and rental strategy. Here are real numbers from California markets — and how to estimate what yours could earn.
From $21,500, adds property value
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