Zoning, building permits and septic rules in San Ramon, California

San Ramon’s own rules

• Building permitRequired

  Work inside San Ramon city limits that is not on the city's building-permit exemption list; the quoted rule is the city's California Plumbing Code exemption text

  • Replacing a defective concealed drain, soil, waste or vent pipe is treated as new work and needs a permit under the city's plumbing rules.
  • Exempt on the same page: one-story detached accessory building with floor area not exceeding 120 s.f. (planning department zoning regulations still apply); patio slabs; sidewalks (contact the engineering division for driveways); painting and papering; carpet, tile or vinyl replacement; fences not over six feet; retaining walls not over four feet; others listed on the page.
  • Construction may proceed after the permit is issued, so status is conditional.

  accessory building exemption floor area: <= 120 sq ft (one-story detached accessory building; planning zoning regulations still apply)

  “one-story detached accessory building provided the floor area does not exceed 120 s.f. (planning department zoning regulations still apply)”

• InspectionsRequired

  Permitted plumbing work inside San Ramon city limits

  • Inspection is required where a permit is required under the quoted plumbing exemption text; work on the city's exemption list does not require inspection under this text.
  • The inspection schedule and the inspection request process were not located.

  “the same shall be considered as new work and a permit shall be procured and inspection made as provided in this code”

• Local zoningPresent (with conditions)

  Land inside San Ramon city limits: the City of San Ramon administers its own zoning ordinance

  • The city's zoning ordinance page states it was adopted October 27, 2015, with latest revisions effective November 13, 2025.
  • The ordinance text (district standards, permit procedures) was not opened in this run; see followups.
  • Land outside city limits, including unincorporated Contra Costa County, is not covered by this claim.

  latest revisions effective: November 13, 2025

  “san ramon zoning ordinance adopted: october 27, 2015 latest revisions effective: november 13, 2025”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask San Ramon or Contra Costa County directly.

• Owner-builder exemption — Owner-builder permit exemption inside San Ramon city limits
• Certificate of occupancy — New dwelling or occupancy approval inside San Ramon city limits
• Zoning districts — Zoning district map and list for San Ramon city
• Minimum dwelling size — Minimum dwelling size, main single-family residential district inside San Ramon city limits
• Minimum lot size — Minimum lot size, main single-family residential district inside San Ramon 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.