ADU Regulations in Alhambra, California (2026)

Regulations at a glance

Local rules & notes

Rent Stabilization Ordinance (RSO) Rent Cap Exemption: While the RSO applies to new ADUs regarding 'just cause' eviction and relocation, they are explicitly exempt from rent restrictions (rent control caps), allowing market-rate pricing. Standard Notes for Garage Conversions: The County offers 'Standard Notes and Details' for existing single-story garage conversions. Using these pre-approved standards can eliminate the need for custom structural plans and calculations. CalHFA ADU Grant Program: The document highlights a grant of up to $40,000 for pre-development costs, specifically listing impact fees and architectural designs as reimbursable items.

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

Frequently asked questions about ADU regulations in Alhambra

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

  In Alhambra, 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; Alhambra may follow state defaults or have local limits. Verify with Alhambra planning for your specific lot.

• What are the setback requirements for ADUs in Alhambra?

  In Alhambra, 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 Alhambra planning for overlay zones or design standards that could affect your site.

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

  In Alhambra, the maximum height for an ADU is generally 25 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 Alhambra or county planning for your zone.

• Is ADU approval ministerial in Alhambra?

  In Alhambra, 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; Alhambra planning can confirm the exact process.

• Are there parking requirements for ADUs in Alhambra?

  In Alhambra, 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 Alhambra planning for your address.