Clear about our role
This is a project-inquiry service for Ann Arbor homeowners. We don't swing hammers ourselves, and we don't claim a license, an office, a crew, past projects, awards, or any promised response time.
What homeowners should verify
Before signing anything for an Ann Arbor project, confirm the provider's identity, applicable licensing, insurance, permits, a written scope, warranties, schedule, and payment terms.
Why local history matters
The city's growth from its 1824 plat outward left foundations that fail in distinct ways. The oldest in-town structures rest on stone and unreinforced masonry, where trouble reads as sloping floors and separating walls rather than a single crack. The clapboard housing of the Old West Side and its bungalow and Tudor infill sits on shallow footings on small lots with little room to excavate. The county's postwar subdivisions are conventional block and poured construction. Beneath all three, frost heave and moisture movement in glacial clay produce seasonal rather than steadily progressive movement.
What that means for foundation repair today
The city's Old West Side, platted starting in 1845 and listed on the National Register in 1972, still carries two-story frame houses built for a fast-growing 19th-century college town -- about 85% clapboard-clad, the rest brick or stucco -- later filled in with Dutch Colonials, bungalows, and Tudor cottages on small lots. Underneath that older core and the newer subdivisions built across Washtenaw County sits a mix of sand, gravel, and clay-rich glacial till left by retreating ice roughly 14,000 years ago -- fertile ground that also drains poorly, one reason foundation inspection, crack repair, and settlement work stays in steady demand across the area.
What official local sources add
The overlay's freeboard requirement — lowest floor at least a foot above the mapped 0.2%-annual-chance elevation — tells you how the city thinks about below-grade risk, and on a parcel inside it, extensive structural work can engage those standards. Beneath the regulation sit two physical mechanisms southern guidance does not describe: glacial till and clay that hold water against foundations and swell, and frost heave that lifts seasonally. A diagnosis naming only one of the two is incomplete.
Sources were reviewed 2026-07-19. Check parcel-specific expansive-soil conditions, historic-district status, and current permit rules for the Ann Arbor parcel in question with the relevant authority before authorizing work.