ADU Construction in Hayward
Hayward is a strong market for ADU construction, with options ranging from $120K for a garage conversion to $425K+ for a large detached unit. Custom Home builds detached, attached, and garage conversion ADUs in Hayward with full 3D visualization and itemized pricing through our two-phase process.
How much does an ADU cost in Hayward?
Hayward ADU costs range from $120K-$225K for a garage conversion to $200K-$425K for a detached unit in 2026. Custom Home's two-phase process provides 3D visualization and exact pricing before construction begins.
Why Hayward is a Strong Market for ADU Construction
Hayward provides some of the Bay Area’s most affordable ADU construction, with build costs and rental math that make the investment accessible to more homeowners. The East Bay’s combination of value and lifestyle continues to attract quality-minded homeowners.
Custom Home builds ADUs in Hayward 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 Hayward
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 Hayward typically range from $200K to $425K.
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 Hayward, starting from $120K. Since the structure already exists, you save on foundation, framing, and roofing costs.
Hayward ADU Permitting
Hayward’s Development Services Department processes building permits for residential construction. Standard plan review takes 4-8 weeks. Hillside properties may require additional geotechnical review and grading permits. The city offers online permit tracking to monitor application status.
Custom Home manages the entire ADU permitting process in Hayward, preparing plans that meet local requirements for efficient review and approval.
ADU Rental Income Potential in Hayward
Hayward’s rental market supports strong returns for ADU owners. Estimated monthly rental rates:
- Studio/1-bedroom (400-600 sqft): $1,800-$2,300/month
- 1-bedroom (600-800 sqft): $2,200-$2,500/month
- 2-bedroom (800-1,200 sqft): $2,300-$2,800/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 Hayward
Hayward ADU construction costs range from $120K for a basic garage conversion to $425K+ for a large detached unit with premium finishes. Per-square-foot costs typically run $300-$475/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.
Hayward Permit Requirements
Hayward's Development Services Department processes building permits for residential construction. Standard plan review takes 4-8 weeks. Hillside properties may require additional geotechnical review and grading permits. The city offers online permit tracking to monitor application status. Custom Home handles the entire ADU permitting process, preparing plans that meet local requirements for efficient approval.
ADU Construction in Hayward: FAQ
What does ADU construction cost in Hayward?
ADU costs in Hayward range from $120K for a garage conversion to $425K+ 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 Hayward?
ADU construction in Hayward 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.
What size ADU can I build in Hayward?
California law allows detached ADUs up to 1,200 sqft on most residential lots. Attached ADUs and garage conversions may have different size limits. Custom Home evaluates your specific lot during Phase 1 to determine the maximum allowable size.