ADU Builder in Los Gatos

We serve Northern California across three regions: the San Francisco Bay Area, Greater Sacramento, and the Central Valley. Our published guides cover 14 counties and 88 cities. Our Castro Valley and Sacramento offices support local estimating, permit coordination, and project planning across these regions.

Financing may be available for eligible projects with approved credit. Available terms depend on lender approval, project scope, and current programs. Your project manager can review the options that apply before work begins. We also accept checks, ACH, and major credit cards.

Yes. Hamilton Exteriors holds CSLB License #1078806, active general liability coverage, and the required contractor bond. We also hold GAF Master Elite and James Hardie Elite Preferred credentials. We can provide current proof of coverage before work begins.

Permit requirements depend on the project scope and local jurisdiction. Hamilton Exteriors coordinates required applications, plan documents, corrections, and inspections. Permit fees and allowances appear in the proposal before construction begins.

A detached ADU in Los Gatos typically costs $200,000 to $375,000 for a 600 to 800 square foot unit with mid-range finishes (Hamilton Exteriors 2024-2026 project data). Garage conversions run $150,000 to $200,000. Junior ADUs start around $150,000. These figures include design, engineering, permits, and construction. Site-specific factors like hillside grading, long utility runs, or WUI fire zone compliance can increase costs.

Yes. All ADUs in California require a building permit. The Los Gatos Building Division handles ADU permit applications. Under state law, the city must approve or deny your application within 60 days. We handle the entire permit process as part of our service.

If you own a single-family home in Los Gatos, you almost certainly can. California state law overrides most local zoning restrictions that previously blocked ADUs. Your lot must meet setback requirements (typically 4 feet from side and rear property lines), and the ADU cannot exceed certain size limits. We evaluate your lot during the initial consultation.

Plan for 6 to 12 months total from design start to move-in. Design and permitting take 2 to 4 months. Construction runs 8 to 14 weeks for detached ADUs and 10 to 14 weeks for garage conversions. The permitting phase is the most variable, though state law requires a 60-day decision.

A Junior ADU (JADU) is the most affordable option at $150,000 and up (Hamilton Exteriors 2024-2026 project data). JADUs are created within your existing home footprint, so there is no new foundation, roof, or exterior walls. The next most affordable is a garage conversion at $150,000 to $200,000.