24H Mold Inspection of Ann Arbor

The Old West Side and Old Fourth Ward hold some of the city's oldest homes — largely built between the 1850s and 1920s, many on the National Register and protected from major exterior changes. Original wood framing, plaster wall assemblies, and rubble or shallow basements let moisture move slowly and hide well, and preservation rules can limit the ventilation or drainage retrofits that would otherwise fix it.

The blocks around South University, Packard, and State Street are dominated by converted multi-unit student rentals, and in parts of the Old Fourth Ward close to all housing is renter-occupied. High occupancy pushes a heavy load of shower, cooking, and drying moisture through aging buildings, and with turnover each spring, problems often develop and sit undetected between tenancies.

Water Hill, lower Kerrytown, and Lower Town sit on low, former industrial ground near the Huron River, where a higher water table presses moisture up into basements and crawl spaces. Homes closest to the river and its floodplain carry a persistent damp load that has little to do with any single leak.

Burns Park and Ann Arbor Hills are anchored by early-to-mid-20th-century family homes — Bungalow, Tudor, and Cottage styles with original plaster walls and coved ceilings. Aging roofs, dated attic ventilation, and the mature tree canopy that shades roofs and clogs gutters make slow attic and wall moisture the common pattern on these owner-occupied streets.

Toward the edges — Northeast Ann Arbor and adjacent Pittsfield Township — the housing shifts to newer subdivisions and townhomes with tighter, well-sealed envelopes. Mold risk here comes less from age and more from trapped interior humidity around bathrooms, laundry areas, and under-ventilated attics, plus rainy-season roof and window intrusion.