Redwood City ADUs: A Step-by-Step Planning Guide

Accessory Dwelling Units (ADUs) are becoming an increasingly popular option for homeowners in Redwood City, California. Known for their versatility, ADUs can serve as rental units, guesthouses, home offices, or multi-generational living spaces. They offer a cost-effective way to add value to your property while addressing housing challenges. If you’re considering building an ADU in Redwood City, this comprehensive guide will walk you through the entire process, from initial planning to final construction.

Understanding ADUs in Redwood City

What Are ADUs?

Accessory Dwelling Units, also known as granny flats or in-law units, are secondary housing units built on the same lot as a single-family home. They can be detached, attached to the main house, or converted from an existing structure like a garage or basement.

Why Choose Redwood City for Your ADU?

Redwood City, nestled in the heart of Silicon Valley, has embraced ADUs as a solution to the region’s housing crisis. The city offers a streamlined permitting process, making it easier than ever for homeowners to construct these units. Additionally, Redwood City’s mild climate and desirable location make ADUs a practical and attractive investment.

Step 1: Evaluate Your Property

Before diving into the ADU construction process, assess your property to determine if it’s suitable for an ADU. Consider these key factors:

1. Lot Size and Zoning
   • Redwood City allows ADUs in residential zones, but the size of your lot may impact the allowable size of the unit.
   • Check zoning regulations to ensure compliance.
2. Utility Access
   • Evaluate the availability of water, sewer, and electrical connections on your property.
3. Existing Structures
   • Determine if you’ll build a new structure or convert an existing space like a garage.

Step 2: Understand Redwood City’s ADU Regulations

Redwood City has specific rules and requirements for ADU construction. Familiarizing yourself with these regulations is crucial to avoid delays or costly mistakes.

Key Regulations:

1. Size Limits
   • Detached ADUs: Up to 1,200 sqft.
   • Attached ADUs: Cannot exceed 50% of the primary dwelling’s size or 1,200 sqft, whichever is smaller.
2. Height Limits
   • Detached ADUs: Up to 16 feet.
   • Taller structures may be allowed in certain cases, subject to additional review.
3. Setbacks
   • Rear and side setbacks: Minimum of 4 feet.
   • Front setbacks: Must comply with the zoning district’s requirements.
4. Parking Requirements
   • No additional parking is required if the ADU is located within half a mile of public transit, within an existing garage, or in certain designated areas.
5. Owner Occupancy
   • As of 2020, Redwood City does not require owner occupancy for ADUs, though this may change in the future.

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Step 3: Develop a Budget

Constructing an ADU is a significant financial investment. Creating a detailed budget will help you plan effectively and avoid surprises.

Cost Breakdown:

1. Design and Permits
   • Architectural designs: $5,000–$15,000.
   • Permits and fees: $5,000–$10,000.
2. Construction
   • Costs range from $200 to $500 per sqft, depending on materials and labor.
3. Utilities
   • Connection fees for water, sewer, and electricity: $10,000–$20,000.
4. Landscaping
   • Budget for any required landscaping or site preparation.
5. Contingency Fund
   • Allocate 10–15% of your budget for unexpected expenses.

Step 4: Design Your ADU

The design phase is where your vision comes to life. Collaborate with an architect or designer who understands Redwood City’s ADU requirements.

Design Tips:

1. Maximize Space
   • Utilize multi-functional furniture and open floor plans to make smaller units feel spacious.
2. Blend with the Main Home
   • Ensure the ADU’s design complements the architectural style of the primary dwelling.
3. Prioritize Natural Light
   • Incorporate large windows and skylights to create a bright and inviting space.
4. Sustainability
   • Use eco-friendly materials and energy-efficient appliances to reduce the ADU’s environmental impact.

Step 5: Obtain Permits

Redwood City’s streamlined ADU permitting process is designed to save homeowners time and hassle. Here’s how to navigate it:

Permit Types:

1. Planning Permit
   • Required for design approval.
2. Building Permit
   • Covers structural, electrical, plumbing, and mechanical work.
3. Utility Permits
   • Necessary for water and sewer connections.

Submitting Your Application:

• Include site plans, floor plans, and elevations in your submission.
• Ensure all documents comply with Redwood City’s ADU guidelines.

Timeline:

• Permit approval typically takes 1–2 months, but this can vary based on the complexity of the project.

Step 6: Choose a Builder

Selecting the right contractor is critical for the success of your ADU project. Take the time to research and interview multiple candidates.

What to Look for in a Contractor:

1. Experience with ADUs
   • Choose a contractor familiar with Redwood City’s ADU regulations.
2. References and Reviews
   • Check online reviews and request references from past clients.
3. Licensing and Insurance
   • Verify that the contractor is licensed and insured in California.
4. Transparent Pricing
   • Ensure the contractor provides a detailed estimate that aligns with your budget.

Step 7: Begin Construction

With permits in hand and a contractor on board, it’s time to start building your ADU.

Construction Phases:

1. Site Preparation
   • Clear the lot and prepare the foundation.
2. Framing and Roofing
   • Construct the frame and install the roof.
3. Plumbing and Electrical
   • Lay pipes and wiring for utilities.
4. Interior Finishes
   • Install flooring, cabinetry, and fixtures.
5. Final Inspection
   • Schedule inspections to ensure compliance with building codes.

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Step 8: Furnish and Landscape

Once construction is complete, focus on furnishing the interior and enhancing the exterior.

Furnishing Tips:

• Opt for compact furniture to maximize space.
• Incorporate storage solutions like built-in shelves or under-bed drawers.

Landscaping Ideas:

• Add a pathway or patio to create a welcoming entrance.
• Plant native vegetation for a low-maintenance yard.

Step 9: Decide on Usage

Determine how you’ll use your new ADU:

1. Rental Income
   • ADUs are an excellent source of passive income in Redwood City’s competitive rental market.
2. Guest Accommodation
   • Use the unit as a comfortable space for visiting friends and family.
3. Home Office
   • Create a quiet and productive work environment separate from the main house.
4. Multigenerational Living
   • Provide a private space for aging parents or adult children.

Step 10: Maintain Your ADU

Regular maintenance ensures your ADU remains functional and appealing.

Maintenance Checklist:

• Inspect plumbing and electrical systems annually.
• Repaint and repair exterior finishes as needed.
• Keep landscaping tidy and free of debris.

Final Thoughts

Building an ADU in Redwood City is a rewarding investment that offers flexibility, additional income, and increased property value. By following this step-by-step guide, you’ll be well-prepared to navigate the planning, design, and construction process with confidence. With proper planning and execution, your Redwood City ADU can become a valuable asset for years to come.

Reach out to our ADU team