About half of Columbia's homes were built before 1980, and many of those are on their second or third set of gutters.
The Census Bureau's American Community Survey (2020–2024 five-year estimates) counts about 62,000 housing units in the city of Columbia. Roughly 30,700 were built before 1980, including about 11,400 built before 1950, and about 30,700 are detached single-family houses. About 46 percent of occupied homes are owner-occupied, low for the region because of the university, Fort Jackson and the many rentals near downtown.
What that means on the ground: older brick ranches in Rosewood and the neighborhoods off Two Notch and Garners Ferry Road, early 1900s houses with deep eaves in Shandon, Melrose Heights and Elmwood Park, and newer subdivisions in Northeast Columbia toward Killian Road. Older houses often have original fascia, mixed gutter sizes from past repairs, and downspouts that dump at the foundation. Newer houses usually have builder-grade 5-inch gutters with too few downspouts.