Oakland County, Michigan does not require seismic foundation anchoring (bolting sill plates to foundations) for existing dwellings. New construction follows the Michigan Residential Code's standard anchor-bolt provisions, which serve wind and uplift loads typical of southeast Michigan rather than seismic shaking. There is no county or municipal retrofit grant or mandate analogous to California's Earthquake Brace + Bolt program.
Under the Stille-DeRossett-Hale Single State Construction Code Act (MCL 125.1501 et seq.), the Michigan Residential Code applies statewide. Section R403.1.6 of the IRC, as adopted by Michigan, requires anchor bolts at not more than 6 feet on center with a minimum of two bolts per plate section in new construction — these requirements address ordinary wind loads, not the elevated seismic loading found in California. No Oakland County ordinance, and no city or township within the county (Royal Oak, Troy, Farmington Hills, Southfield, Rochester Hills, Novi, Pontiac, Auburn Hills, Birmingham, Bloomfield Hills, Waterford, West Bloomfield, Commerce, Independence, White Lake, Oxford), imposes a retroactive anchoring requirement on pre-code dwellings. The U.S. Geological Survey maps Oakland County in a low seismic hazard zone (Site Class D, S_S generally below 0.15g).
Not applicable. New residential construction must comply with the Michigan Residential Code anchor-bolt provisions enforced by the municipal building department issuing the permit; failure to do so can result in stop-work orders and required corrections under MCL 125.1521 before a certificate of occupancy issues.
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See how Oakland County's foundation anchoring rules stack up against other locations.
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