ADU Regulations in Menlo Park, California (2026)

Regulations at a glance

Local rules & notes

Electrification Readiness for ADU Conversions: ADU conversions must include electrical raceways and panel capacity to support future conversion of gas appliances (stoves, dryers, water heaters) to electric. Mandatory Heat Pump Upgrades: When upgrading or replacing air conditioning units during an ADU conversion, the city requires the installation of a heat pump (reverse cycle AC) unless the cost differential exceeds 20% of the project cost. EV Charging Infrastructure Waiver: ADUs and JADUs are specifically exempted from the new residential EV charging requirements if the project does not include the addition of new parking facilities.

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

Frequently asked questions about ADU regulations in Menlo Park

• What is the maximum ADU size in Menlo Park, California?

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

• What are the setback requirements for ADUs in Menlo Park?

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

• What is the maximum height for an ADU in Menlo Park?

  In Menlo Park, 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 Menlo Park or county planning for your zone.

• Is ADU approval ministerial in Menlo Park?

  In Menlo Park, 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; Menlo Park planning can confirm the exact process.

• Are there parking requirements for ADUs in Menlo Park?

  In Menlo Park, 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 Menlo Park planning for your address.