ADUs

Manufactured home ADUs in San Diego County. What you need to know.

A factory-built home placed as an ADU on your San Diego property can cost $180k to $300k or more all-in, including the unit, delivery, foundation, utilities, and permits. ADUs 750 square feet or under are exempt from impact fees, which saves roughly $10k to $30k in San Diego County. As of April 4, 2026, San Diego County adopted AB 1033, which allows ADUs in unincorporated areas to be sold separately as condos. That is a significant shift in how manufactured ADUs can be used.

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Compact manufactured home installed as a backyard ADU on a San Diego County residential lot

What this covers

Explain current ADU rules in San Diego County and individual city jurisdictions
Walk you through the AB 1033 condominium-sale option for ADUs in unincorporated areas
Help you understand what size limits, setback rules, and permit requirements apply to your parcel
Explain when a manufactured home qualifies as an ADU and when a modular or prefab is a better fit
Clarify impact fee exemptions and when they apply
Connect you with vetted contractors and dealers who build manufactured ADUs in San Diego County
Help you ask the right questions about utility connections, foundation type, and HCD compliance

ADUs guide illustration for San Diego County manufactured home buyers

When this applies to you

You own a single-family lot and want to add a granny flat or rental unit
You want a lower-cost ADU option compared to a stick-built addition
You're interested in the AB 1033 condo-sale option in unincorporated San Diego County
You want to house a family member on your property
You are evaluating whether a manufactured or modular unit is the right fit for your lot

What buyers ask about ADUs

What is AB 1033 and how does it affect manufactured ADUs in San Diego?

AB 1033, effective statewide January 1, 2024 and adopted by San Diego County effective April 4, 2026, allows ADUs to be sold separately from the primary residence as condominiums in participating jurisdictions. In unincorporated San Diego County, this means you could theoretically build a manufactured ADU, then sell it as an independent condo unit while retaining your primary home. Some details are still being finalized as of mid-2026. Cities within San Diego County have their own adoption timelines, so check the specific jurisdiction before relying on this option.

Are there impact fee exemptions for ADUs?

Yes. California law exempts ADUs 750 square feet or smaller from most local impact fees. In San Diego County, those fees can run $10k to $30k depending on the area, so sizing your ADU at or under 750 square feet is often worth doing deliberately. Larger ADUs are subject to fees proportional to the size of the primary dwelling.

Does a manufactured home meet ADU building standards?

A manufactured home built to HUD standards can serve as an ADU, but it must be permanently affixed to a foundation to meet most local requirements. Some jurisdictions require that an ADU meet the same building code as site-built construction, which means a modular home built to California Title 24 is often a cleaner fit than a HUD-code manufactured home for ADU purposes. We can help you figure out which approach works on your specific parcel.

Do I need to live on the property to build an ADU?

No. California removed owner-occupancy requirements for most ADUs in 2020, and those protections remain in effect in 2026. You can build a manufactured ADU as a rental unit without living on the property. Some jurisdictions have attempted to reimpose occupancy rules, so verify with your specific city or county planning department.

What permits are required for a manufactured ADU?

At minimum, you need a building permit and typically a grading permit if site work is involved. For a manufactured home specifically, you also need HCD approval for the installation, an inspection by a licensed contractor to verify the foundation and utility connections, and an HCD Form 433A recorded if you want to convert the home to real property. Your local planning department may also require design review depending on the zone.

Coverage area

Where we help buyers in San Diego County

We connect buyers across every city and community in San Diego County. Pick your city for local market notes and community-specific details.

Central ADUs in San Diego San Diego is both a park-living hub and a private-land placement city. Beach communities and urban neighborhoods lean toward ADU conversions on owned lots. Inland communities like Encanto and Skyline have older mobile-home parks with affordable spaces. HCD 433A filings and HUD post-1976 certification apply to all private-lot placements.

North Coastal ADUs in Oceanside Oceanside has one of the largest manufactured-home and mobile-home park inventories in North San Diego County. East Oceanside and the Rancho Del Oro area have active all-age and 55-plus parks with reasonable space rents. Military families stationed at Camp Pendleton frequently consider park homes as an affordable housing option near the base.

North Coastal ADUs in Carlsbad Carlsbad has established 55-plus manufactured-home communities particularly inland near Calavera Hills and the eastern corridors. Buyers appreciate the city's amenities and North County coastal access at a fraction of single-family home costs. Private-lot placement on larger residential lots near Palomar Airport Road is possible for buyers who own the land.

North County Inland ADUs in Escondido Escondido is a manufactured-home hub for North County Inland. It has more mobile-home parks and 55-plus manufactured-home communities than most cities in the region. Buyers get inland San Diego proximity at lower land and space costs. Private-lot placements happen in the rural eastern edges near Valley Center Road and Felicita.

East County ADUs in El Cajon El Cajon has the highest concentration of mobile-home parks in East County. Parks range from all-age family communities to 55-plus retirement communities. Land costs are among the lowest in the county for private placements. Buyers looking for affordable East San Diego County living with quick freeway access frequently land here.

South County ADUs in Chula Vista Chula Vista has one of the largest manufactured-home and mobile-home park populations in San Diego County. Parks are spread across both western and eastern Chula Vista. The city draws a large bilingual buyer base, and newer Otay Ranch areas have larger lots suited to private placements. Navy families stationed nearby consider park homes as an affordable housing alternative.

Coastal ADUs in La Jolla La Jolla is premium coastal land where manufactured-home placement is not a realistic path for most buyers. The area attracts high-end custom modular buyers who want architectural design with faster delivery than site-built. ADU modular placements on large La Jolla Farms or La Jolla Shores lots are the most common use case we see here.

Central ADUs in Scripps Ranch Scripps Ranch is a suburban master-plan community with limited manufactured-home park inventory. Larger lots in the community allow ADU manufactured-home placements for multi-generational families. AB 1033 makes selling a manufactured ADU separately legally possible. Buyers interested in park living look further east toward Santee or south toward El Cajon for more park options.

See adus in all 67 cities

ADUs in Alpine ADUs in Bonita ADUs in Bonsall ADUs in Borrego Springs ADUs in Boulevard ADUs in Camp Pendleton ADUs in Campo ADUs in Carlsbad ADUs in Casa de Oro ADUs in Chula Vista ADUs in Coronado ADUs in Crest ADUs in Del Mar ADUs in Descanso ADUs in Dulzura ADUs in El Cajon ADUs in Encinitas ADUs in Escondido ADUs in Fairbanks Ranch ADUs in Fallbrook ADUs in Granite Hills ADUs in Guatay ADUs in Harbison Canyon ADUs in Hidden Meadows ADUs in Imperial Beach ADUs in Jacumba ADUs in Jamul ADUs in Julian ADUs in Kearny Mesa ADUs in La Jolla ADUs in La Mesa ADUs in La Presa ADUs in Lake San Marcos ADUs in Lakeside ADUs in Lemon Grove ADUs in Mira Mesa ADUs in Mission Valley ADUs in Mount Laguna ADUs in National City ADUs in Oceanside ADUs in Pacific Beach ADUs in Palomar Mountain ADUs in Pine Valley ADUs in Potrero ADUs in Poway ADUs in Rainbow ADUs in Ramona ADUs in Ranchita ADUs in Rancho Bernardo ADUs in Rancho Peñasquitos ADUs in Rancho San Diego ADUs in Rancho Santa Fe ADUs in San Diego ADUs in San Marcos ADUs in San Ysidro ADUs in Santa Ysabel ADUs in Santee ADUs in Scripps Ranch ADUs in Shelter Valley ADUs in Solana Beach ADUs in Spring Valley ADUs in Tecate ADUs in Tierrasanta ADUs in Valley Center ADUs in Vista ADUs in Warner Springs ADUs in Winter Gardens

Real feedback

What buyers say about working with us

Examples of the kind of guidance we work to give every buyer. Verified reviews from real buyers will live on our Google Business Profile when they're earned.

We had five acres of family land sitting empty for years. Land & Home SD walked us through every step: the dealer search, HCD permits, foundation requirements, and Section 6506 compliance. We closed on a three-bedroom home in four months. Never could have navigated that alone.

Land and Home Placement Ramona

We wanted to add a unit for my mother-in-law without a full construction project. Land & Home connected us with a dealer who had the right floor plan, explained the AB 1033 rules, and confirmed the permit path before we spent a dollar. The ADU is on the foundation and she moved in right on schedule.

Manufactured Home ADU Vista

I'd been renting for three years after my husband passed. The consultant helped me understand space-rent leases versus land-owned parks, and found me a well-maintained 55-plus community two miles from my daughter. I own my home now. That matters more than I can say.

55+ Park Purchase El Cajon

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