West Palm Beach incorporated in 1894 as the first municipality in what's now South Florida, but most of its historic housing dates to the 1920s land boom — the Flamingo Park, El Cid, Old Northwood, Grandview Heights and Northwest neighborhoods were largely built out between about 1910 and 1930. Development slowed for decades after the boom went bust, then postwar and later growth pushed the city west past its original narrow downtown strip once drainage work opened up more land from the 1960s on. The result is a real mix of roof ages, not one dominant build-out decade the way a lot of newer suburbs are.
The 1920s-era homes in the historic districts are often on barrel or flat concrete tile, matching their Mediterranean revival and mission-style architecture; newer postwar and western neighborhoods run more toward standard asphalt shingle. Downtown and along the waterfront there's also a meaningful amount of condo and commercial low-slope roofing, which is a different scope of work than a house call.
West Palm Beach has several locally designated historic districts, and the city's Historic Preservation staff review roofing changes within them — the general guidance is replacement in-kind, meaning tile stays tile and matches the original profile, with substitutions like shingle considered only case-by-case for hardship. That review sits on top of, not instead of, the standard building permit, so a reroof in Flamingo Park or El Cid can take longer to schedule than one in a non-historic neighborhood.