Tiny home rules in Hesperia, 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.
Hesperia treats permanently sited tiny homes as Accessory Dwelling Units under §16.12.360, allowing detached ADUs up to 1,200 sq ft (minimum 150 sq ft) on lots with an existing single-family residence. Detached ADUs are capped at 16 ft in height with 4-foot side/rear setbacks. Manufactured homes under 10 years old qualify. RVs explicitly do not qualify as ADUs under §16.12.360(E)(2).
Under Hesperia MC §16.12.360, an Accessory Dwelling Unit (ADU) provides complete independent living facilities and is the legal pathway for a permanently sited tiny home. Detached ADUs may not exceed 1,200 sq ft of livable floor area, while attached ADUs may be up to 50% of the principal unit (max 1,000 sq ft). No ADU may be less than 150 sq ft. Per §16.12.360(E)(8), a detached ADU is limited to 16 feet in height — extendable to 18 ft within 0.5 mile of a major transit stop, plus 2 ft to align roof pitch. Attached ADUs may reach 25 ft / 2 stories. New ADUs require 4-foot side and 4-foot rear setbacks (§16.12.360(E)(4)). State-implementing law: Cal. Gov. Code §65852.2 (preempting local bans) and §65852.22 (JADUs). Junior ADUs under §16.12.360(F) are capped at 500 sq ft, must be inside an existing single-family residence, require owner occupancy, and prohibit rentals under 30 days. ADU rentals citywide must be 30+ days (§16.12.360(D)(7)) — short-term tiny-home Airbnb operation is prohibited. Tiny homes on wheels (THOWs) registered as RVs do not qualify as ADUs and cannot be used as permanent dwellings on residential lots. Mojave Water Agency hookup and Lahontan Regional Water Quality Control Board septic rules apply: lots not on sewer must be at least 1 gross acre or use a Supplemental Treatment Septic System (§16.12.360(D)(10)).
An unpermitted tiny home or RV used as a dwelling is a Title 16 violation. Hesperia Code Enforcement may issue administrative citations under CMC Chapter 1.10 ($100 / $200 / $500 escalating) and order vacation of the structure. Building Division may also pursue uninhabitability orders. ADU rentals under 30 days violate §16.12.360(D)(7) and trigger separate citations.
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