ADU Construction in Redwood City
Redwood City is a strong market for ADU construction, with options ranging from $175K for a garage conversion to $550K+ for a large detached unit. Custom Home builds detached, attached, and garage conversion ADUs in Redwood City with full 3D visualization and itemized pricing through our two-phase process.
How much does an ADU cost in Redwood City?
Redwood City ADU costs range from $175K-$275K for a garage conversion to $300K-$550K for a detached unit in 2026. Custom Home's two-phase process provides 3D visualization and exact pricing before construction begins.
Why Redwood City is a Strong Market for ADU Construction
Redwood City is a strong market for ADU construction, with property values and rental demand that support the investment. Homeowners use ADUs for rental income, multigenerational living, and home offices. Established neighborhoods and proximity to both San Francisco and Silicon Valley create consistent demand for quality construction.
Custom Home builds ADUs in Redwood City with the same two-phase design-build process we use for custom homes. You see the complete design in 3D and receive itemized pricing before any construction begins.
Types of ADUs We Build in Redwood City
Detached ADUs
A standalone structure in your backyard, typically 400-1,200 sqft. Detached ADUs offer the most privacy and design flexibility. They work well for rental units, home offices, or multigenerational living. Construction costs in Redwood City typically range from $300K to $550K.
Attached ADUs
Built as an addition to your existing home, sharing at least one wall. Attached ADUs are typically more cost-effective than detached units since they share structural elements with the main house. They are a good fit for family members who want proximity while maintaining separate living spaces.
Garage Conversions
Converting an existing garage into a living space is the most affordable ADU option in Redwood City, starting from $175K. Since the structure already exists, you save on foundation, framing, and roofing costs.
Redwood City ADU Permitting
Redwood City’s Community Development department handles residential building permits. Standard plan review takes 4-6 weeks for most residential projects. The city offers online permit applications and plan submissions. Hillside properties in Emerald Hills and Cordilleras Heights may require additional geotechnical review. ADU permits follow a streamlined review track with typical turnaround of 3-4 weeks.
Custom Home manages the entire ADU permitting process in Redwood City, preparing plans that meet local requirements for efficient review and approval.
ADU Rental Income Potential in Redwood City
Redwood City’s rental market supports strong returns for ADU owners. Estimated monthly rental rates:
- Studio/1-bedroom (400-600 sqft): $2,400-$2,900/month
- 1-bedroom (600-800 sqft): $2,800-$3,500/month
- 2-bedroom (800-1,200 sqft): $3,300-$3,800/month
At these rates, many ADU investments pay for themselves within 7-12 years through rental income alone, not counting the property value increase that a permitted ADU provides.
Pricing for ADU Construction in Redwood City
Redwood City ADU construction costs range from $175K for a basic garage conversion to $550K+ for a large detached unit with premium finishes. Per-square-foot costs typically run $400-$600/sqft. Garage conversions are the most cost-effective option since the structure already exists. Custom Home provides itemized pricing during Phase 1 so you know every cost before committing.
Redwood City Permit Requirements
Redwood City's Community Development department handles residential building permits. Standard plan review takes 4-6 weeks for most residential projects. The city offers online permit applications and plan submissions. Hillside properties in Emerald Hills and Cordilleras Heights may require additional geotechnical review. ADU permits follow a streamlined review track with typical turnaround of 3-4 weeks. Custom Home handles the entire ADU permitting process, preparing plans that meet local requirements for efficient approval.
ADU Construction in Redwood City: FAQ
What does ADU construction cost in Redwood City?
ADU costs in Redwood City range from $175K for a garage conversion to $550K+ for a large detached unit. The biggest cost factors are ADU type, size, finishes, and utility connections. Custom Home provides itemized pricing during Phase 1 so you know every cost upfront.
How long does it take to build an ADU in Redwood City?
ADU construction in Redwood City typically takes 6-12 months from design to move-in. Garage conversions are fastest at 4-6 months, while detached units take 8-12 months including permits. Custom Home's design phase front-loads decisions to keep construction on schedule.
Does Redwood City offer pre-approved ADU plans?
Many Bay Area cities, including some in San Mateo County, offer pre-approved ADU plans that can reduce permitting time. Custom Home can advise on whether pre-approved plans are available for your Redwood City property or whether a custom design is the better option.