ADU Permits in Los Gatos: The 2026 Process, Fees, and Timeline

Los Gatos issues ADU permits ministerially, the way state law requires: a decision within 60 days of a complete application, no public hearing, and no neighbor sign-off. The town follows the California state baseline (Government Code sections 66310 to 66342), which guarantees nearly every single-family lot a detached ADU of up to 1,200 square feet, with 4 foot side and rear setbacks and at least an 800 square foot, 16 foot unit no matter what local standards say.

The short version: State law is the operative rulebook in Los Gatos, and it preempts stricter local rules. The real local variable is terrain: flat in-town lots are straightforward, while hillside parcels add engineering and placement work. With some of the highest home values in our service area, the ADU math here is compelling. We run the entire permit, with a permitting budget built into one project price.

The Los Gatos ADU permit process, step by step

1. Confirm the baseline for your parcel. Up to 1,200 square feet detached, 4 foot side and rear setbacks, no owner-occupancy requirement, at most one parking space with broad exemptions, all state-guaranteed. Our Can I build? rules lookup has the citations.
2. Classify your lot: flat or hillside. In-town streets near the village are level and simple. Foothill parcels above Highway 9 or off Kennedy Road can involve slope, geology, and access questions that shape placement and foundation design. Neither blocks an ADU; the second just takes more engineering.
3. Design and engineer the plans. Site plan, floor plans, structural, and Title 24, drawn to the town’s objective standards so plan check goes one round instead of three.
4. Submit and manage plan check. The 60-day ministerial clock runs from a complete application. Objective review only; taste is not on the checklist.
5. Permit, build, inspect. Foundation and utility work on site while the home is built in our factory, then crane delivery and final inspection.

As our client you hand off every step above, with a permitting budget built into the one project price. Your exact permit fees are confirmed in your feasibility study.

The Los Gatos math

Los Gatos consistently posts some of the highest home values in Santa Clara County, and that changes the ADU calculus in two ways. First, rental demand is deep, proximity to Netflix’s campus, downtown, and good schools keeps long-term tenants plentiful. Second, every square foot of permitted living space you add is capitalized at Los Gatos prices when your home is appraised. Our guides on ADU cost in Los Gatos and ADU appraisal and resale value walk through both sides.

A popular configuration here is the two-bedroom: our 749 square foot model at $369,000, all-inclusive of construction, stays under the impact-fee threshold, while the 945 square foot three-bedroom, two-bath at $479,000 suits multigenerational setups. The county-wide picture is in our Santa Clara County ADU regulations guide.

Los Gatos ADU fees

The state framework controls the big line items: impact fees are waived for ADUs under 750 square feet, and at 750 square feet or larger they must be proportional to the primary dwelling. Building permit fees scale with project size, and hillside parcels can carry additional engineering costs, which belong in your budget from day one, not as a surprise later. Every fee is itemized in your feasibility study and included in your contract price.

How long the permit takes

The 60-day ministerial window from a complete application is the anchor, with hillside engineering adding preparation time in front of it. The town’s review pace is the part no builder can schedule, so we run everything else in parallel: your home is about 97% built in our Salinas factory, roughly 55 minutes away, while the town reviews. The week-by-week version is in our Los Gatos ADU timeline guide.

Frequently asked questions

Can I build an ADU on a Los Gatos hillside lot?

Usually yes. Slope adds foundation engineering, grading review, and crane planning, but it rarely blocks a well-placed unit. Factory building helps because the home arrives about 97% complete, minimizing on-site work on a tight hillside street. We assess slope and access in the free site visit.

Does Los Gatos require owner-occupancy?

No. State law removed owner-occupancy requirements for standard ADUs and towns cannot impose them. A JADU, the under-500-square-foot unit inside your home’s walls, carries one only if it shares a bathroom with the main house.

Do I need to add parking?

At most one space, with broad exemptions: within a half mile walking distance of transit, replacing a garage, or converting existing space. Many in-town Los Gatos lots qualify for an exemption; we confirm yours before design.

Will an ADU pay off in Los Gatos?

The combination of deep rental demand and high appraisal values makes Los Gatos one of the strongest ADU markets in our service area. Run your own numbers in our ROI calculator, then let the feasibility study pressure-test them for your parcel.

Get a straight answer for your Los Gatos lot

Flat or hillside, village or foothills, the honest answer lives in your parcel data. Book a free property analysis and our team will pull your records and tell you exactly what your lot supports. The conversation is free and takes about half an hour.