Featured photo: Mojave Desert landscape in Sheephole Valley by Shinichiro Ichimura / Unsplash. Illustrative only; not a photograph of a Trona parcel or its zoning.

SEARLES VALLEY NEWS | TRONA, SAN BERNARDINO COUNTY | OCTOBER 18, 2026. Vacant lots in Trona and the wider Searles Valley can look inexpensive on property listings, but a low price and an assessor parcel number do not establish whether a new home, manufactured home or other structure can legally be built. Residents and prospective buyers can begin with the San Bernardino County Land Use Services official zoning maps, then review the Development Code and consult the county about their specific parcel.

First: verify who regulates the property

San Bernardino County says its Development Code governs land uses in unincorporated areas. Trona and the Searles Valley are unincorporated communities, so county land-use rules are the relevant starting point. This is not the same as checking a parcel inside an incorporated city, where city zoning may apply. The county’s Planning Division provides an interactive zoning lookup that accepts an assessor parcel number (APN). The county cautions users to independently verify information for their particular project.

Second: do not mistake assessor records for building approval

The San Bernardino County Assessor explicitly warns that its records do not determine permitted property use or legal ownership. That means a parcel appearing on an assessor map is not proof that the land is an approved residential building site. Confirm the legal parcel status, current zoning district, allowed use, lot standards and applicable overlays through the planning department. The county’s Development Code describes requirements for permitted uses and construction approvals.

Third: check permits before ordering a manufactured home or starting construction

The county’s Building and Safety Division explains that its permit process includes plan review, permit issuance, inspections and final approval. Its public website also links to permit research and an online permitting system. Ask which permits, inspections and design requirements apply to the exact property and proposed structure; do not assume that a factory-built home avoids county land-use or installation approvals.

Fourth: investigate water, septic, roads and environmental conditions

A remote desert parcel may need an approved water source, wastewater disposal, legal road access and a feasible electricity connection. Local environmental health, fire and public works requirements may be relevant. A nearby occupied house does not guarantee a neighboring lot has the same access or utility rights. Buyers should also review drainage and flood exposure, wildfire information, and any site-specific geologic or environmental issues before committing funds.

A practical checklist for Trona buyers

  1. Find the APN using the county assessor resources.
  2. Search that APN in the official zoning map and note the zoning district and any overlays.
  3. Read the relevant Development Code provisions, then request written parcel-specific guidance from Planning.
  4. Ask Building and Safety about building plans, permits, inspections and any available permit history.
  5. Verify legal access, water, septic feasibility, utility service and title with the responsible agencies or qualified professionals.
  6. Do not buy on the assumption that a tax assessment, a dirt road or a seller’s verbal promise makes the lot buildable.

Where to ask questions

San Bernardino County Land Use Services lists 909-387-8311 and an office at the Jerry Lewis High Desert Government Center, 15900 Smoke Tree Street, Suite 131, Hesperia. Check the official county website for current contact and appointment information before visiting.

Related California58 guides: Why an APN does not prove buildability; Manufactured-home permits; Researching well records; and Legal road access and easements.

Primary sources: San Bernardino County Zoning and Overlay Maps; Development Code; Assessor Property Information; Building and Safety. This article does not certify the buildability of any particular parcel.

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