Slidell's architecture reflects its historical and economic development. In its early years, the town featured simple, functional structures primarily built with wood, meeting the practical needs of a burgeoning railroad town. These early buildings typically had steeply pitched roofs covered with wood shingles, ideal for shedding frequent rain.

As Slidell prospered in the late 19th and early 20th centuries, more elaborate architectural styles emerged. Victorian and Queen Anne styles became popular, characterized by intricate woodwork, decorative trim, and asymmetrical facades. Metal roofing, often tin or galvanized steel, gained popularity during this period for its durability and fire resistance.

The mid-20th century saw the introduction of new architectural styles, including Craftsman and later, the ubiquitous ranch-style homes. These homes often featured low-pitched roofs with wide eaves, and asphalt shingles became the preferred roofing material due to their cost-effectiveness and ease of maintenance.