ADU Construction in San Ramon
San Ramon 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 San Ramon with full 3D visualization and itemized pricing through our two-phase process.
How much does an ADU cost in San Ramon?
San Ramon 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 San Ramon is a Strong Market for ADU Construction
San Ramon 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. Excellent schools and family-oriented communities drive demand for well-designed homes.
Custom Home builds ADUs in San Ramon 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 San Ramon
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 San Ramon 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 San Ramon, starting from $175K. Since the structure already exists, you save on foundation, framing, and roofing costs.
San Ramon ADU Permitting
San Ramon’s Community Development Department handles building permits with thorough plan review. Standard residential plan review takes 4-8 weeks. The city requires design review for new construction in certain neighborhoods. Properties in HOA communities must obtain architectural approval before city permit submittal.
Custom Home manages the entire ADU permitting process in San Ramon, preparing plans that meet local requirements for efficient review and approval.
ADU Rental Income Potential in San Ramon
San Ramon’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 San Ramon
San Ramon 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.
San Ramon Permit Requirements
San Ramon's Community Development Department handles building permits with thorough plan review. Standard residential plan review takes 4-8 weeks. The city requires design review for new construction in certain neighborhoods. Properties in HOA communities must obtain architectural approval before city permit submittal. Custom Home handles the entire ADU permitting process, preparing plans that meet local requirements for efficient approval.
ADU Construction in San Ramon: FAQ
What does ADU construction cost in San Ramon?
ADU costs in San Ramon 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 San Ramon?
ADU construction in San Ramon 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 San Ramon?
Yes. California law allows ADU rentals, and San Ramon does not require owner-occupancy. Many homeowners earn $2,400-$3,800/month in rental income from their ADU, making it a strong investment.