ADU Regulations in Signal Hill, California (2026)

Regulations at a glance

Local rules & notes

Mandated ADU Incentives: The city is required to implement Program 3.1, which specifically focuses on creating ADU incentives and ensuring the ordinance meets statutory requirements. HCD Revocation Authority: HCD explicitly warns that it may revoke housing element compliance if the city fails to implement the ADU program actions described. Funding Eligibility Linkage: Compliance with ADU and Housing Element law is a prerequisite for CalTrans SB 1 and HCD Permanent Local Housing Allocation funding.

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

Frequently asked questions about ADU regulations in Signal Hill

• What is the maximum ADU size in Signal Hill, California?

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

• What are the setback requirements for ADUs in Signal Hill?

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

• What is the maximum height for an ADU in Signal Hill?

  In Signal Hill, 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 Signal Hill or county planning for your zone.

• Is ADU approval ministerial in Signal Hill?

  In Signal Hill, 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; Signal Hill planning can confirm the exact process.

• Are there parking requirements for ADUs in Signal Hill?

  In Signal Hill, 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 Signal Hill planning for your address.