Backyard Tiny Homes in San Diego: A Homeowner's Guide (2026)
Lots of San Diego homeowners are looking at their backyards in a new way. A tiny home can house family, earn rental income or become a home office. Here's what the City and County of San Diego allow today.
Ready to start? Fill out the Zen Tiny Homes Buyers Application or call Zen Tiny Homes at 760-492-0742.
Why San Diego Homeowners Are Going Tiny
Family housing: a private place close by for aging parents, grown kids or a caregiver.
Rental income: a long-term renter can help pay the mortgage.
A home office or studio: a quiet space to work, away from the main house.
Two Ways to Do It: Wheels or Foundation
Tiny home on wheels: built on a trailer, registered with the DMV, and parked on a paved pad. The City calls it a "movable tiny house."
Foundation ADU: a small home on a permanent foundation, permitted as an accessory dwelling unit (ADU).
City of San Diego: What's Allowed
The City allows movable tiny houses in many residential zones. The main rules from the San Diego Municipal Code:
150 to 430 square feet, one story, DMV-registered, and not self-propelled. No separate address.
Behind or beside the main house, not in the front yard.
At least 5 feet from a neighbor's lot line, 10 feet from other buildings, and within 150 feet of the street.
Wheels stay on but hidden from view, resting on jacks on a paved surface.
Connected to water, sewer and electric. No natural gas.
Certified to the NFPA 1192 or ANSI A119.5 standard, with a label. All Zen Tiny Homes are built to ANSI standards.
Extra fire rules apply in Very High Fire Hazard Severity Zones.
Foundation ADUs in the City: a detached ADU can be 150 to 1,200 square feet. Side and rear setbacks are small (often none for ADUs 16 feet tall or less; 4 feet in high fire hazard zones). Most need no parking. ADUs can't be rented for less than 31 days in a row.
San Diego County (Unincorporated Areas)
In unincorporated areas like Ramona, Fallbrook or Lakeside, County rules apply. Since September 4, 2025, the County treats a qualifying tiny home on wheels as a dwelling that can be a main home or an ADU:
Under 430 square feet, one floor plus a sleeping loft up to 150 square feet, and no more than 16 feet tall.
Built to the ANSI A119.5 park model standard and certified by a third-party inspector, with a sticker before the permit is issued. All Zen Tiny Homes are built to ANSI standards.
Fire-safe outside: noncombustible walls, a Class A roof and dual-glazed windows.
At least 6 feet from other buildings, on a paved pad, DMV-registered, and connected to electric, water and sewer with building permits.
A detached foundation ADU in the County can be up to 1,200 square feet. Live in Carlsbad, Oceanside, Chula Vista or another city? Each has its own ADU rules, and our site assessment checks what fits your lot.
Want a tiny home on wheels as your main home in the County? Read Live Full-Time in a Tiny Home on Wheels in Unincorporated San Diego County. Shopping for land? See Buying Land for a Tiny Home in Unincorporated San Diego County.
State Law Helps Homeowners
Under California law, ADU permits are decided by staff with no public hearing, and a complete application must be approved or denied within 60 days when there's already a home on the lot.
Your Backyard Tiny Home Checklist
Know whether you're in the City of San Diego, another city, or the unincorporated County.
Choose wheels or a foundation.
Measure your yard, including a clear delivery path.
Plan water, sewer and electric hookups.
Pick a floor plan and set your budget. See California Tiny Home Floor Plans.
Book a $500 site assessment to see what fits your lot.
How Zen Tiny Homes Helps
Zen Tiny Homes builds tiny homes for San Diego and all of California and helps with every step:
$500 site assessment: we check your spot, delivery access and utility hookups.
Plans: the Alpine (a flex plan in 20', 22' or 24', from $50K), the Mammoth (up to 30', from $75K), the Container (from about $40K), or Custom. See the Ranch House and Grove House plans for ideas.
Build and delivery: built off-site, then delivered and set up in your yard.
Reserve your spot: a $500 deposit holds your place on the build list.
New to this? Start with 7 Steps to the Tiny Home Dream or Tiny Homes in San Diego County.
Related Guides
Frequently Asked Questions
Can I put a tiny home on wheels in my San Diego backyard?
Yes, in many cases. Both the City and the County allow certified tiny homes on wheels that meet their rules. Rules vary by property; our site assessment checks what fits your lot.
How big can a backyard tiny home be in San Diego?
A tiny home on wheels must stay under about 430 square feet. A detached foundation ADU can be up to 1,200 square feet.
Do I need a permit for a backyard tiny home?
Yes. Tiny homes on wheels need approval and permits for their hookups, and foundation ADUs need a building permit. Our $500 site assessment checks what fits your lot.
Can I rent out my backyard tiny home?
Yes, as a long-term rental. In the City of San Diego, ADUs can't be rented for less than 31 days in a row.
Floor Plan Preview
Here's a look at two of the designs Zen Tiny Homes can build. Every plan can be adjusted to fit your lot.
Mammoth: floor plan
Mammoth: 3D section views
See all the layouts in California Tiny Home Floor Plans.
Ready to Add a Tiny Home to Your Backyard?
The best first step is a site assessment. Tell us about your project and we'll help you pick the right plan.
Prefer to talk? Call Zen Tiny Homes at 760-492-0742 or visit zentinyhomes.com.
This guide is general information, not legal advice. Rules change and vary by property. Our $500 site assessment checks what fits your lot, or call 760-492-0742.
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