For property under unincorporated San Diego County jurisdiction, an eligible manufactured home can be permitted on a private lot when the home, parcel, foundation plan, and installation meet the County’s requirements. A city address can follow a different process, so confirm the governing agency before selecting a home or budgeting the work.
Search results for this topic are dominated by land-and-home listing portals. Those pages show inventory. They do not confirm whether a specific parcel can take a manufactured home. If you arrived from a “mobile homes with land” listing, use this page as the eligibility and permit checklist before treating any ad as a workable match. The County’s current PDS 103 private-lot guide is the rule sheet for unincorporated County land.
Check the home’s eligibility first
San Diego County’s current Manufactured Home on a Private Lot guide identifies two eligible age groups for permanent placement:
- Mobilehomes built from September 15, 1971 through June 14, 1976
- Manufactured homes built on or after June 15, 1976
The unit also needs the applicable California HCD insignia of approval or federal manufactured-home certification described by the County. This means a pre-HUD mobilehome is not automatically disqualified solely because it predates June 15, 1976. Ask County staff to review the unit’s construction date, insignia or label, alteration history, and proposed parcel before buying or moving it.
A park model trailer follows a different rule. The County guide classifies it as a recreational vehicle and does not approve it for permanent habitation on a private lot. Limited temporary uses require separate County approval.
Confirm the parcel and jurisdiction
The County guide applies to property governed by unincorporated San Diego County. It requires the project to comply with the County Zoning Ordinance, Subdivision Ordinance, Health and Safety Code, and other rules that apply to residential structures. Subject to those requirements, a manufactured home may share a lot with a conventionally constructed dwelling.
Use the property address and assessor’s parcel number when contacting Planning & Development Services. Ask staff to confirm:
- Whether the County or a city governs the parcel
- Whether the proposed residential use is allowed
- Which zoning, subdivision, fire, grading, water, sewer, and other clearances apply
- Whether another dwelling on the lot changes the review
- Which application forms and plans are current
A listing’s zoning label or mailing city is only a starting point. Get the answer for the exact parcel and proposed home before committing to either one.
Review foundation and exterior requirements
For a home installed on a designated foundation system in unincorporated County jurisdiction, the owner or licensed contractor must obtain a building permit before installation and comply with California Health and Safety Code Section 18551.
The County’s current guide also includes exterior and site requirements. Among them:
- Exterior covering generally extends to grade or the top of a solid concrete or masonry perimeter foundation.
- Roofs generally have at least a 2:12 pitch and use materials customary for conventional dwellings.
- Roof overhangs generally extend at least one foot, with stated exceptions and possible Director waivers in the circumstances described by the guide.
- Wildland-Urban Interface requirements vary with the unit’s manufacture date and address and can include ignition-resistant construction, roof, ventilation, and noncombustible underfloor-enclosure provisions.
Do not turn these general standards into a design decision without County review. The guide contains exceptions, and fire-area requirements depend on the property and home.
Assemble the County permit file
The County guide lists a building permit application and construction documents that include a plot plan, foundation plan, floor plan and exterior elevations, installation instructions, exterior details, and the applicable HCD and County forms. A foundation plan may be prepared by a California-licensed architect or engineer or use a plan with current HCD approval.
Additional approvals can involve zoning, public works, environmental health, parks, the fire agency, schools, water, and sewer districts. County staff identify the applicable clearances during submittal.
Ask PDS for its current checklist before ordering plans. Give every dealer, designer, installer, and site professional the same parcel and home information so their scopes match the agency’s requirements.
Understand inspection, occupancy, and recording
County inspections occur during foundation, underground utility, and other covered work. A passed final inspection precedes the certificate-of-occupancy and recording steps.
For foundation-system installation, the County guide describes completion and recording of HCD Form 433(A). It also requires the owner to follow the registration-cancellation rules tied to Health and Safety Code Section 18551. California HCD separately states that a manufactured home installed on a foundation system is no longer registered by HCD.
Keep the permit record, plans, inspection results, certificate of occupancy, recorded 433(A), registration-cancellation material, and any assessor document together. Ask the County, HCD, escrow professional, and lender to verify what was completed for the specific property. A reference to “433A” in a listing does not prove the current record by itself.
Build the budget from property-specific quotes
Site cost depends on the parcel, home, design, access, foundation, grading, utilities, fire requirements, permits, and required professional work. A countywide price range cannot answer those questions for one lot.
Request written, itemized figures from each party responsible for the work. Separate:
- Home purchase and factory options
- Delivery and setup
- Foundation design and construction
- Grading, drainage, driveway, and access work
- Water, sewer or septic, electricity, and gas
- County and district fees
- Required reports, plans, inspections, and corrections
- Financing, insurance, escrow, and recording costs
Mark unknown items as pending. Do not use a regional average as though it were a quote for the parcel.
Plan around the agency and project sequence
Project timing depends on design readiness, application completeness, agency clearances, site conditions, utility work, inspections, corrections, and the home’s delivery schedule. Ask each responsible party for its current step, prerequisite, and estimated duration. Then build a coordinated schedule that shows which work cannot start until another approval or task is complete.
If the property is in a city, ask that city for its process. If it is under County jurisdiction, start with the County Planning & Development Services site and the current private-lot guide.
Where to start
Bring the parcel address, assessor’s parcel number, proposed home information, label or insignia details, and any existing site records to the first agency conversation. Confirm eligibility and jurisdiction before treating the home or land as a workable match.
Land & Home SD can help buyers organize parcel, home, dealer, and installer questions. Call (858) 400-4608 or visit our home on private land service page to start the conversation.