Redwood City ADU Regulations & Building Guide

Known for its vibrant culture and diverse community, Redwood City is a prominent city in California, featuring beautiful landscapes, innovative industries, and rich history.

California State ADU Laws

California has some of the most progressive ADU legislation in the country. Recent laws including AB 68, SB 13, and AB 881 have significantly streamlined the ADU approval process and reduced barriers for homeowners.

Key California ADU Regulations:

• Size Limits: Detached ADUs can be up to 1,200 sq ft. Attached ADUs can be up to 50% of the primary dwelling or 1,200 sq ft, whichever is less.
• Setbacks: Minimum 4-foot side and rear setbacks for detached ADUs.
• Height: Generally up to 16 feet, with some exceptions for two-story ADUs (up to 25 feet in certain zones).
• Parking: No additional parking required in most cases, especially near transit.
• Owner Occupancy: No owner-occupancy requirement until 2025 for most ADUs.

Redwood City Local Requirements

While California state law provides baseline regulations, Redwood City may have additional local requirements. GatherADU's team stays current with Redwood City's specific zoning codes, architectural guidelines, and permit processes to ensure your ADU project meets all requirements.

Common local considerations in Redwood City include:

• Design review requirements and architectural standards
• Utility connection fees and impact fees
• Fire department access requirements
• Neighborhood-specific overlay zones

California law (AB 68, AB 881, SB 9, and subsequent legislation) guarantees your right to build ADUs. Cities cannot:

• Require owner-occupancy for ADUs permitted after 2020
• Require additional parking for ADUs near transit
• Charge impact fees for ADUs under 750 sq ft
• Deny ADUs that meet state minimum standards
• Impose lot coverage limits that prevent a 800 sq ft ADU

If you believe your ADU application is being unfairly denied, California HCD can intervene on your behalf.

California ADU Legislation Overview

California leads the nation in ADU-friendly legislation. The state has passed numerous laws to encourage ADU construction as a solution to the housing crisis.

Key California ADU Laws:

• AB 68 (2020): Reduced local government review time and expanded ADU construction options.
• SB 13 (2020): Limited impact fees and reduced owner-occupancy requirements.
• AB 881 (2020): Prohibited minimum lot size requirements and allowed JADUs in all zones.
• AB 2221 (2022): Further streamlined the ADU approval process.
• SB 897 (2022): Increased height limits for ADUs in certain zones.

California ADU Benefits:

• Property value increase of 20-30% on average
• Rental income potential of $1,500-$3,500+ monthly
• Housing flexibility for family members
• No owner-occupancy requirements (until 2025)

Redwood City, California, with a population of approximately 85,259, is a vibrant city located on the San Francisco Peninsula in the heart of Silicon Valley. Known for its rich history, cultural diversity, and economic vitality, Redwood City has embraced Accessory Dwelling Units (ADUs) as a means to provide additional housing options and address the region's housing shortage.

Geography and History

Redwood City is strategically situated between San Francisco and San Jose, offering a blend of urban and suburban environments. The city’s history dates back to the mid-1800s, with its name derived from the redwood forests that were once prevalent in the area. Today, Redwood City is known for its thriving downtown, historic landmarks, and proximity to major tech hubs.

Local Economy

Redwood City’s economy is dynamic and diverse, driven by several key sectors:

• Technology: As part of Silicon Valley, the city hosts numerous tech companies and startups.
• Healthcare: Home to major medical centers and biotech firms.
• Retail and Hospitality: A bustling downtown with shops, restaurants, and entertainment venues.
• Education: Close to prestigious universities and research institutions.

Popular Neighborhoods

Redwood City features several notable neighborhoods, each with its own unique charm:

• Emerald Hills: Known for its scenic views and upscale homes.
• Mt. Carmel: A historic neighborhood with tree-lined streets and charming architecture.
• Redwood Shores: Offers waterfront living with modern amenities.
• Downtown: A vibrant area with a mix of residential, retail, and cultural attractions.

Real Estate Market

The real estate market in Redwood City is competitive, with high property values and strong demand for housing. ADUs are increasingly popular as homeowners seek to maximize their property’s potential and create additional living spaces or rental units.

ADU Regulations in Redwood City

Redwood City has established comprehensive regulations for ADUs to promote housing development while maintaining community standards:

• Zoning: ADUs are allowed in residential zones, including single-family and multi-family areas.
• Types of ADUs: Both attached and detached ADUs are permitted, as well as conversions of existing structures like garages and basements.
• Size Limits:
  • Detached ADUs: Maximum size is 1,200 sqft.
  • Attached ADUs: Up to 50% of the primary dwelling’s size, not exceeding 1,200 sqft.
• Height Restrictions: Detached ADUs have a height limit of 16 feet, with potential for two-story units in some zones.
• Parking: One additional off-street parking space is required, though exceptions exist for ADUs near public transit or in historic districts.
• Owner Occupancy: The property owner is not required to live on-site.
• Approval Process: ADUs that meet zoning and design criteria can be approved administratively, streamlining the process.
• Design Standards: ADUs must be consistent with the primary dwelling’s architectural style and materials.
• Multiple ADUs: One ADU and one Junior ADU (JADU) are allowed per lot, providing flexibility for property owners.

Cultural Landmarks and Unique Aspects

Redwood City boasts several cultural and historical landmarks:

• Fox Theatre: A historic theater and popular venue for live performances.
• San Mateo County History Museum: Located in the old courthouse, offering exhibits on local history.
• Red Morton Park: A large community park with recreational facilities.
• Pulgas Water Temple: A beautiful monument commemorating the Hetch Hetchy Aqueduct.

Redwood City’s ADU regulations reflect the city’s commitment to addressing housing needs while preserving its unique character and quality of life. By providing clear guidelines and facilitating the approval process, Redwood City encourages the development of ADUs as a viable housing solution. The city’s approach balances growth with community values, ensuring that new developments enhance the living standards and vibrancy of Redwood City.

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