ADU Regulations in Merced, California (2026)

Regulations at a glance

Local rules & notes

5-Year Enforcement Delay: Owners of unpermitted ADUs built before January 1, 2020, can request a 5-year delay in enforcement for building code violations provided they are not health/safety issues. HOA/CC&R Restrictions Voided: Homeowners associations and private covenants cannot prohibit or unreasonably restrict the construction or use of an ADU on single-family lots. 60-Day Deemed Approved Rule: If a local agency does not approve or deny a completed ADU application within 60 days, the application is 'deemed approved' by operation of law.

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

Frequently asked questions about ADU regulations in Merced

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

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

• What are the setback requirements for ADUs in Merced?

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

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

  In Merced, 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 Merced or county planning for your zone.

• Is ADU approval ministerial in Merced?

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

• Are there parking requirements for ADUs in Merced?

  In Merced, parking for ADUs is generally false. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Merced planning for your address.