ADU Construction in Los Altos
Los Altos is a strong market for ADU construction, with options ranging from $200K for a garage conversion to $650K+ for a large detached unit. Custom Home builds detached, attached, and garage conversion ADUs in Los Altos with full 3D visualization and itemized pricing through our two-phase process.
How much does an ADU cost in Los Altos?
Los Altos 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 Los Altos is a Strong Market for ADU Construction
Los Altos 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 Los Altos 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 Los Altos
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 Los Altos 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 Los Altos, starting from $200K. Since the structure already exists, you save on foundation, framing, and roofing costs.
Los Altos ADU Permitting
Los Altos Community Development processes residential building permits with a typical plan review period of 4-6 weeks. New construction and major additions require design review approval, which evaluates the project’s compatibility with neighborhood character. The city’s online permit portal allows digital submissions and status tracking.
Custom Home manages the entire ADU permitting process in Los Altos, preparing plans that meet local requirements for efficient review and approval.
ADU Rental Income Potential in Los Altos
Los Altos’ 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 Los Altos
Los Altos 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 $500-$750/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.
Los Altos Permit Requirements
Los Altos Community Development processes residential building permits with a typical plan review period of 4-6 weeks. New construction and major additions require design review approval, which evaluates the project's compatibility with neighborhood character. The city's online permit portal allows digital submissions and status tracking. Custom Home handles the entire ADU permitting process, preparing plans that meet local requirements for efficient approval.
ADU Construction in Los Altos: FAQ
What does ADU construction cost in Los Altos?
ADU costs in Los Altos 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 Los Altos?
ADU construction in Los Altos 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.
Can I rent out my ADU in Los Altos?
Yes. California law allows ADU rentals, and Los Altos does not require owner-occupancy. Many homeowners earn $2,800-$4,500/month in rental income from their ADU, making it a strong investment.