San Diego Building Division
The Building Division provides county building-permit resources. Establish whether your parcel is in an incorporated city or the unincorporated county before relying on this application route.
California county resources
Manufactured homes in San Diego County
Net Cost serves San Diego County. Use these local resources to investigate the parcel before choosing a home. Delivery, installation scope and project feasibility need a site-specific review.
Local research
Select the correct private-lot or park route
Building forms and handouts
San Diego's library separates manufactured homes on private lots from manufactured homes and accessory structures in parks. Identify the relevant category with staff and confirm park enforcement through HCD before preparing the installation package.
Septic-system questions
The County’s septic FAQ explains where system records can be obtained. Review those records with Environmental Health and Quality before assuming an existing system can support the proposed home or additional bedrooms.
Resources checked October 20, 2026. These official resources are research starting points. Confirm current requirements with the responsible agency for your parcel and project.
Official permit and application resources
Building forms and handouts
Issuing agency: San Diego County Planning and Development Services — Building Division
Purpose: Find building applications and manufactured-home forms; select the route appropriate to private-lot or park work.
Jurisdiction: County resource. Confirm County authority for an unincorporated parcel; for incorporated-city parcels, begin with the city and verify any contracted County review. Park installation authority must be checked separately through HCD or the authorized local enforcement agency.
Link checked October 20, 2026. Use the agency’s current forms and instructions. Confirm the required application category, form revision, supporting plans and inspection steps with that agency. These are outgoing official links; Net Cost does not host the forms. A listed resource does not establish parcel eligibility, a complete submittal or permit approval.
Confirm who reviews the project
First establish whether the parcel is inside an incorporated city or in the unincorporated county. For a city parcel, begin with the city’s planning department and confirm its building authority; some cities contract building review to the county or another agency. For an unincorporated parcel, begin with County Planning and Building. A postal city name does not determine jurisdiction.
Park placement follows a separate enforcement route: use HCD’s local enforcement agency guidance and confirm park-management requirements. For water, sewer, wells or septic, identify the actual provider and reviewing agency; county geography does not establish a utility service boundary.
Serving this county does not mean every parcel qualifies. Read the shared site-planning checklist for utility checks and the information needed to compare complete project estimates.
Plan your project
Discuss your site in San Diego County
Share the parcel and intended use so we can discuss the home and the work needed for your site.