ADU Builder in Los Gatos, CA
Los Gatos occupies a distinct position in Silicon Valley’s housing market — a small town with a walkable downtown, a consistently top-rated school district, and a residential character that draws long-term tenants who specifically want this setting. The combination of quality-of-life factors and tech employment proximity keeps rental demand strong and tenant turnover low.
An ADU in Los Gatos is most commonly built for one of two purposes: a premium long-term rental, the kind of tenant who’ll pay above-market rent to stay in a top school district or multigenerational housing for a family that wants to keep aging parents close while maintaining separate living spaces.
The town follows California’s state ADU framework with a few local parameters, including an 18-foot detached height limit (with a 25-foot option for attached units above a two-story home) and a parking requirement that goes one step further than most cities.
ADU Regulations in Los Gatos
Los Gatos follows California’s state ADU standards but applies its own development guidelines for single-family and multi-family properties.
For single-family lots, homeowners may build one detached or attached ADU and one Junior ADU (JADU). Detached and attached ADUs can be up to 1,200 square feet, while JADUs are limited to 500 square feet. Setbacks are based on the underlying zoning for the front yard, with 4 feet required at the rear and side. Detached ADUs are limited to 18 feet in height, while attached ADUs built above a two-story home may reach 25 feet. A minimum 5-foot separation is required between the ADU and the primary residence.
On multi-family lots, property owners may add detached ADUs equal to 25 percent of the number of existing units, rounded up to the nearest whole number. These units may also be up to 1,200 square feet. JADUs are capped at 500 square feet, with the same setback and separation rules as single-family lots. Detached ADUs are limited to 18 feet in height, while attached units above two-story buildings may reach 25 feet.
These standards allow homeowners in Los Gatos to maximize livable space, rental potential, and long-term property value while keeping projects compliant with local zoning and development codes.
Build Your ADU in Los Gatos
Enter your address in ParcelZ to verify eligibility, check zoning-based setbacks, confirm the parking requirement for your lot, and see which ADU configurations work for your property.
The Los Gatos ADU Permitting Process
Los Gatos uses an online permitting system with a Permit Decision Tool that helps homeowners determine what application package is needed before submittal. This upfront guidance reduces back-and-forth during plan check. Review is ministerial, no design hearings or discretionary approvals, and completes within 60 days of a complete application.
Free Feasibility Study
Apex verifies your zoning (and the corresponding front setback), confirms whether the 18-ft or 25-ft height limit applies to your unit type, checks the additive parking requirement, and calculates buildable area. This determines exactly which floor plans fit your lot before any design investment.
Select a Floor Plan
Los Gatos allows up to 1,200 sq ft for both detached and attached ADUs. The 18-ft height limit shapes the roof form for detached units; attached units going above a two-story home have 25 ft to work with. Apex matches a floor plan to your lot and configuration.
Prepare & Submit via Permit Decision Tool
Apex prepares the full application package: site plan, architectural and structural drawings, Title 24 energy calculations, utility and load plans, and submits through the Los Gatos online permits portal. The Permit Decision Tool confirms the required documents before submittal to avoid incomplete-application delays.
Review & Inspections
The Town reviews the application within 60 days. Once approved, all inspections — foundation, framing, utilities, final occupancy — are scheduled through the portal. A Certificate of Occupancy is issued after the final inspection passes.
Why Build an ADU in Los Gatos?
Building an ADU in Los Gatos can increase property value by 25–35 percent and provide rental income or flexible living space for family and guests. ADUs are ideal for multigenerational households, aging-in-place, or long-term visitors, offering privacy and independence in a compact space. They also support higher-density infill housing, helping to expand the local housing supply in a cost-effective way while enhancing community diversity.
For more detailed information or specific guidance, we can book a 1 on 1 with an Apex Home ADU expert. Let us help you transform your property with a thoughtfully planned ADU today!
Have questions? Contact Apex Homes Today
Our team knows Los Gatos’ zoning, permits, and pricing inside out. Call us for a free, no-pressure conversation about your property. We’ll tell you exactly what’s possible.