What Follows You and What Does Not
The distinction worth holding, because owners generalise both ways.
Follows you everywhere: the Air District requirements. Regulation 11, Rule 2 applies across nine counties, so the ten working day notification, the survey obligation and the treatment of untested debris as regulated material are identical in Santa Clara, Sunnyvale, Milpitas, Campbell, Cupertino, Los Gatos, Saratoga, Mountain View, Morgan Hill, Gilroy and unincorporated county alike.
Also follows you: the seismic acts. Alquist-Priolo and the Seismic Hazards Mapping Act are state law and reach every parcel in the county. The full position is on our page covering the debris and the ground.
So What Actually Changes at a City Line?
The Unusual Consequence
Because the regional rule does not vary, an owner in this county can establish the most consequential fact in the file without knowing which city they are in.
The testing decision, the notification requirement and the classification of untested debris are the same everywhere here. That is genuinely helpful and it is rare across the markets we work in, where the first question is almost always which jurisdiction has the address.
Then Why Does the Jurisdiction Matter at All?
We publish no permitting requirements, fees or timelines for the individual Santa Clara County cities. Each sets its own and each will state the current position for your address.
Stock Varies More Than the Rules Do
Housing across these cities ranges from pre-war through to recent construction, and the build era does more to determine a fire file here than the municipal boundary does.
Older dimensional framing chars rather than failing at connections and can frequently be retained. Later engineered roof trusses and floor systems come out whole once heat has reached the connections. And much of the Bay Area's stock predates 1980, which bears directly on what a survey is likely to find.
The Hazard Mapping Is on Your Disclosure
Wherever in the county the property sits, both fault zones and seismic hazard zones appear on the natural hazard disclosure statement given to a buyer under Civil Code section 1103.2.
An owner who bought the property received that statement, so the answer is frequently already in a file at home rather than something to be commissioned.
The County in Context
Where fault and slope mapping bite hardest inside the city, see our page about south San Jose and the Almaden foothills. Where the oldest stock raises what a survey finds, see our page for downtown and central San Jose.
The Numbers That Do Not Change Anywhere Here
Regulation 11, Rule 2 applies across 9 counties: 10 working days' notification before every demolition, 72 hours for residential buildings of 4 or fewer dwelling units, and renovation thresholds of 100 square feet, 100 linear feet or 35 cubic feet.
Public Resources Code sections 2621 to 2630 apply statewide, with the 50 foot prohibition, the 50 per cent exemption and the 4 May 1975 date. Assembly Bill 1046 amended sections 2621.6, 2621.7 and 2621.8 on 13 October 2023.
County Questions
Do the Air District Rules Apply in My City?
Yes. They apply identically across all nine counties the district regulates, including everywhere in Santa Clara County.
Who Issues My Building Permit?
Your own city, or the county for unincorporated parcels. San Jose is not the default and the assessor's record names the jurisdiction.
Will You Buy Outside San Jose?
Yes, across the county's cities and unincorporated areas. The jurisdiction affects the process and therefore the figure, and it does not stop us buying.