California county resources
Net Cost serves Marin 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
The agency groups development-related divisions in one directory. Identify the Planning, Building and Environmental Health contacts relevant to the property so site constraints can be considered before ordering a home.
Marin advises early Environmental Health discussions when buying, improving or adding an ADU to property served by septic. Ask staff how the current program applies to the proposed installation; do not infer new-home eligibility from an existing dwelling.
Resources checked October 20, 2026. These official resources are research starting points. Confirm current requirements with the responsible agency for your parcel and project.
Issuing agency: Marin County Community Development Agency — Building and Safety
Purpose: Choose the County's application process by project scope; new-home installation is not assumed to qualify for quick maintenance permits.
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.
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
Share the parcel and intended use so we can discuss the home and the work needed for your site.