ADU Regulations in Redwood City, California (2026)

Regulations at a glance

Local rules & notes

ADU One-Stop Shop Pilot: The city contributed funds to a pilot program providing free project management services to homeowners building ADUs. Over-the-Counter Ministerial Review: Expedited ministerial review is available for routine one-story ADU projects. Design Flexibility for Tandem Parking: The city allows tandem parking and parking within setbacks to increase site design feasibility.

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

Frequently asked questions about ADU regulations in Redwood City

• What is the maximum ADU size in Redwood City, California?

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

• What are the setback requirements for ADUs in Redwood City?

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

• What is the maximum height for an ADU in Redwood City?

  In Redwood City, 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 Redwood City or county planning for your zone.

• Is ADU approval ministerial in Redwood City?

  In Redwood City, 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; Redwood City planning can confirm the exact process.

• Are there parking requirements for ADUs in Redwood City?

  In Redwood City, 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 Redwood City planning for your address.