Zoning, building permits and septic rules in Cupertino, California

Cupertino’s own rules

• Building code adoptedAdopted (with conditions)

  Building construction inside Cupertino city limits

  • Adopted with city amendments; the 2025 California codes are the current editions, effective January 1, 2026.
  • Projects submitted after January 1, 2026 must comply with the 2025 codes; projects under the 2022 codes had to be submitted before December 23, 2025.
  • The page says the building division has suspended enforcement of Cupertino Municipal Code chapter 16.32 (all-electric construction) after a Ninth Circuit decision, pending a new ordinance.

  “the city of cupertino has adopted the 2025 california code of regulations, title 24 with certain amendments.”

• Local zoningPresent (with conditions)

  Land inside Cupertino city limits: the city adopts and administers its own zoning ordinance (Single Family R1, Residential Hillside, Duplex R-2, Multiple Family R-3 and R-4, and Residential Single-Family Cluster R1c districts, per the city's residential planning page).

  • Properties may be subject to multiple zoning designations; the city says to use its zoning tools to determine all applicable designations.
  • The page does not state the numeric dimensional limits; those were not verified from an official page.

  “zoning districts and the corresponding zoning ordinance determine what can be built on your property and which uses are allowed on your property.”

• Zoning districtsPartial

  Residential zones in Cupertino city limits

  • The residential planning page lists residential zones only; non-residential districts and the zoning map were not verified.
  • Mixed-use and non-residential zoning are covered on a separate city page not opened.

  “residential zones include: single family (r1) residential development the single family zoning ordinance regulates detached single family dwellings.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Cupertino or Santa Clara County directly.

• Owner-builder exemption — Owner-builder permits inside Cupertino city limits
• Inspections — Building inspections inside Cupertino city limits
• Certificate of occupancy — Certificates of occupancy inside Cupertino city limits
• Minimum dwelling size — Minimum dwelling size, R1 single-family district, inside Cupertino city limits
• Minimum lot size — Minimum lot size, R1 single-family district, inside Cupertino city limits

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.