ADU Builder in Cupertino
Looking for an ADU builder in Cupertino? Options range from $200K for a garage conversion to $650K+ for a large detached unit. Custom Home builds detached, attached, and garage conversion ADUs in Cupertino with full 3D visualization and itemized pricing through our two-phase process.
How much does an ADU cost in Cupertino?
Cupertino ADU costs range from $200K-$325K for a garage conversion to $375K-$650K for a detached unit in 2026. Custom Home's two-phase process provides 3D visualization and exact pricing before construction begins.
Why Cupertino is a Strong Market for ADU Construction
Cupertino homeowners are increasingly building ADUs for extended family, home offices, and rental income. The area’s strong property values and luxury standards make ADU investment a sound decision. Silicon Valley’s tech-driven economy supports strong demand for modern, energy-efficient residences.
Custom Home builds ADUs in Cupertino 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 Cupertino
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 Cupertino typically range from $375K to $650K.
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 Cupertino, starting from $200K. Since the structure already exists, you save on foundation, framing, and roofing costs.
Cupertino ADU Permitting
Cupertino’s Community Development Department handles residential building permits. Plan review for new construction typically takes 4-6 weeks. The city offers counter permits for minor projects and requires design review for homes in the Monta Vista hillside area. Online permit tracking is available through the city’s portal.
Custom Home manages the entire ADU permitting process in Cupertino, preparing plans that meet local requirements for efficient review and approval.
ADU Rental Income Potential in Cupertino
Cupertino’s rental market supports strong returns for ADU owners. Estimated monthly rental rates:
- Studio/1-bedroom (400-600 sqft): $2,800-$3,300/month
- 1-bedroom (600-800 sqft): $3,200-$4,200/month
- 2-bedroom (800-1,200 sqft): $4,000-$4,500/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 Cupertino
Cupertino ADU construction costs range from $200K for a basic garage conversion to $650K+ 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.
Cupertino Permit Requirements
Cupertino's Community Development Department handles residential building permits. Plan review for new construction typically takes 4-6 weeks. The city offers counter permits for minor projects and requires design review for homes in the Monta Vista hillside area. Online permit tracking is available through the city's portal. Custom Home handles the entire ADU permitting process, preparing plans that meet local requirements for efficient approval.
ADU Construction in Cupertino: FAQ
What does ADU construction cost in Cupertino?
ADU costs in Cupertino range from $200K for a garage conversion to $650K+ 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 Cupertino?
ADU construction in Cupertino 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 Cupertino?
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.