Imperial County, CA Accessory Structures: Tiny Homes (2026)
Tiny home rules in Imperial County, CA, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- Size definition
- 400 sq ft or less, excluding lofts
- Modular/site-built
- Full building code applies
- RV/manufactured
- Regulated as park models instead
- Classification
- Treated as dwelling, not accessory structure
Summary
Imperial County applies full building code review to site-built and modular tiny homes under 400 square feet, while RVs and manufactured park models follow separate state rules.
The California Residential Code 2019 Edition defines a tiny home as a dwelling that is four hundred (400) square feet or less in floor area, excluding lofts.
Tiny homes are dwellings. A dwelling is considered by building codes to be used as a non-transient occupancy for the purposes of living, which includes sleeping and cooking. Dwellings are not for transient use, where occupants unfamiliar with the building will stay temporarily, such as a hotel room.
Dwellings are therefore generally subjected to the same building code regulations as any other home.
Scope of building codes:
Tiny homes are built in different ways, and it is important to identify which types of tiny homes fall within the scope and application of building codes.
Types of tiny homes include the following:
•Recreational vehicles.•Manufactured homes (park models).•Modular dwellings.•Site-built dwellings. Building codes will apply only to tiny homes in the form of modular dwelling and site-built dwellings. Those taking the form of recreational vehicles and manufactured homes are not regulated by building codes but are under the regulation of park models and recreation vehicles standard. (See Division 12, Chapter 2.)
For the purposes of these guidelines, a tiny home is intended for permanent and non-transitory occupancy or residency. Also, for the purposes of these guidelines, tiny homes are not attached to multiple units and would not be configured or used as a bunkhouse.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 62 - 9-25).
Full Breakdown
The county's ordinance on applying building codes to tiny homes adopts the California Residential Code definition, a dwelling of 400 square feet or less, excluding lofts, and states that building codes apply only to tiny homes built as modular or site-built dwellings. Tiny homes taking the form of recreational vehicles or manufactured park models fall outside building-code review and are instead regulated under the county's park-model and RV standards in Division 12, Chapter 2. A qualifying tiny home is treated as a full single-family dwelling, not an accessory structure.
Violations & Fines
Occupying a modular or site-built tiny home that skipped required building permits and inspections violates Title 9's building regulations, subject to citation and misdemeanor penalties under § 91002.32.
Frequently Asked Questions
Does a tiny home need a building permit in Imperial County?
Can I count a tiny home as an accessory structure?
Sources & Official References
Other rules in Imperial County
California rules heatmap·Compare Imperial County to another location·View the California accessory structures overview
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