Although the traditional English style of cottage is most typical in America, cottages can be built in a variety of styles depending upon location and the builder's tastes, ranging from Spanish house floor plan designs of the Southwest, which typically have single stories, stucco exteriors, and tile roofs; to Cape Cod cottages which are usually box-like, timber-framed structures two-stories high, with steep roofs to shed rain and snow.
Nowadays architectural soundness has acquired a new meaning, with the advent of sustainable designing. A dwelling sheathed in solar panels has a very different aesthetic than the usual suburban house. Multi-unit housing which eliminates the thermal bridges created by extensive glazing and concrete decks do not share the aesthetic of glass paneled high rise towers. Passive solar designs often borrow elements from local architectural styles to address local climactic conditions.
If you are looking at building a family home for example, then storage space for recreational gear such as bikes, boats and tents should be considered, as should backyard space for outdoor activities.
Aesthetics is in the eye of the beholder, and it depends upon the prevailing tastes of the time. A building's functionality, or fitness, is a matter of how well it accommodates the purposes for which it was built. Its structural integrity means soundness - will the building last over time? Historically speaking aesthetics has usually trumped fitness as the overriding factor in architectural design. Classical architecture was preoccupied with articulating features on walls and facades. Modern architecture is equally concerned with aesthetic formalities, such as form following function.