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Building an ADU in Los Gatos

One combined ADU/JADU application takes Planning and Building in a single review, with no parking and no traffic impact fee. Hillside lots lose the 4 ft setback shortcut, and fire-zone parcels carry sprinkler, access and defensible-space obligations. A new ADU ordinance was before Council in August 2026.

Pre-approved plans

Checked 2026-09-10

AB 1332 gallery on the ADU Accelerator platform; modifications to pre-approved plans are not allowed. Under state law a detached unit built from a pre-approved plan gets a 30-day decision instead of 60.

Program page →

Programs and incentives

  • Active

    Single combined application

    Planning and Building use one application and one plan-review track to reach a building permit.

    Los Gatos's page → Checked 2026-09-10
  • Active

    Traffic impact fee exemption

    ADUs are exempt from transportation analysis and traffic impact fees under the town's policy.

    Checked 2026-09-10
  • Confirm with the city

    Fee waiver for deed-restricted affordable units

    A Housing Element program commits to waiving building permit fees for units deed-restricted to lower-income households. Implementation not verified.

    Checked 2026-09-10

Local rules worth knowing

  • Maximum size. 1,200 sq ft; JADU 500 sq ft within the residence including an attached garage.
  • Height. Detached 16 ft; 18 ft within half a mile of major transit (+2 ft to match the main roof); attached up to 25 ft.
  • Coverage and parking. Roofed structures capped at 40% lot coverage in R-1, R-D and R-M; no additional parking for any ADU.
  • Hillside. Hillside units must meet the main building's setbacks and the Hillside Development Standards on form, colour and materials.
  • Fire. Sprinklers if the main home requires them, and possibly for new construction depending on access and water; 100 ft defensible space in fire-hazard zones.
  • Short-term rental. Under 30 days prohibited for ADUs approved after 6 February 2018.
  • Ordinance update. Planning Commission recommended a new ADU ordinance in June 2026 and Council was scheduled for 4 August 2026; the outcome could not be verified, so numeric standards may have changed.

We build here

Los Gatos is inside our service area, and ADUs are all we do. We bring in the architect and engineer or work with yours, run the permit with Los Gatos, and build with our own crew: about 6 weeks of construction for a detached unit once the permit is in hand.

What we can't tell you from here is what your particular lot will take: setbacks, the sewer lateral, the panel, grade and access. That is what the free site walk is for.

Check your address

Free feasibility report based on state, city, and local jurisdictions.

Takes about ten seconds. Nothing is stored unless you ask for the report by email.

Text updates

Replies to your questions, site walk reminders and project status, sent to your phone by Bayfront Contracting (Bayfront ADU). You can stop them at any time.

Leaving the box unchecked is fine, and the form still submits. Consent is not a condition of purchasing or using Bayfront Contracting services. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for help. Mobile opt-in information is never shared with third parties for their marketing.