ADU Regulations in Hesperia, California (2026)

Regulations at a glance

Local rules & notes

Illegal R-3 Zone Prohibition: The City's code section 16.16.085 attempted to prohibit ADUs in the R-3 zone. HCD declared this a violation of state statute. Subjective Entry Requirements: The City required ADU entrances to be installed to eliminate 'obvious indication of two units'. HCD rejected this as subjective and impermissible. Subjective Nuisance Constraints: The City attempted to deny ADUs based on 'excessive noise, traffic' or 'adverse impacts'. HCD rejected these as subjective terms not allowed in ministerial processing.

For the official ordinance and latest updates, check your city or county planning department.

Frequently asked questions about ADU regulations in Hesperia

• What is the maximum ADU size in Hesperia, California?

  In Hesperia, the maximum ADU size is typically 1200 square feet, depending on whether the unit is attached or detached. California state law allows up to 1,200 sq ft for detached ADUs and 800 sq ft for attached in many jurisdictions; Hesperia may follow state defaults or have local limits. Verify with Hesperia planning for your specific lot.

• What are the setback requirements for ADUs in Hesperia?

  In Hesperia, typical setback requirements are 4 feet from the side property line and 4 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Hesperia planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Hesperia?

  In Hesperia, the maximum height for an ADU is generally 16 feet. State law often allows up to 16 feet for detached ADUs and up to 25 feet when within 4 feet of the property line in some cases. Confirm with Hesperia or county planning for your zone.

• Is ADU approval ministerial in Hesperia?

  In Hesperia, ADU approval is typically Ministerial (by-right) per Gov Code §65852.2. Ministerial (by-right) review means the city must approve qualifying applications without discretionary review, per California Gov Code § 65852.2. Your project must still meet objective standards; Hesperia planning can confirm the exact process.

• Are there parking requirements for ADUs in Hesperia?

  In Hesperia, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Hesperia planning for your address.