Anaheim, CA Earthquake Safety: Foundation Anchoring (2026)

California Existing Building Code Appendix Chapter A3 (Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light Wood-Frame Residential Buildings) provides a standardized retrofit path that Anaheim and most California jurisdictions accept over the counter. The retrofit addresses two common weaknesses in pre-1960 single-family homes: unbolted sill plates (the bottom wood plate resting on the concrete foundation) and unbraced cripple walls (short stud walls between the foundation and first floor). Retrofits install 1/2-inch or 5/8-inch expansion anchors or epoxy anchors through the sill plate into the stemwall at spacing typically not exceeding 4 or 6 feet, and add structural plywood sheathing with nailing to cripple walls to resist lateral shear. The California Earthquake Brace and Bolt program, run jointly by CEA and Cal OES, offers grants up to 3,000 dollars (and supplemental income-based grants up to 7,000 dollars) for qualifying pre-1980 houses with a raised foundation in enrolled zip codes, which have included several Anaheim zip codes in recent program years. Permits are required from the Anaheim Planning and Building Department; the Standard Plan Set A (SPA) prescriptive plans are accepted without custom engineering for most retrofits. Typical contractor cost before grant is 3,500 to 6,500 dollars. Homes with slab-on-grade foundations do not need foundation bolting but may need other measures.