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The scope of "architectural works" for copyright is given in U.S. law as:

An “architectural work” is the design of a building as embodied in any tangible medium of expression, including a building, architectural plans, or drawings. The work includes the overall form as well as the arrangement and composition of spaces and elements in the design, but does not include individual standard features. (17 U.S. Code §101)

"Building", as used in 17 U.S. Code §101, is further defined as:

Humanly habitable structures that are intended to be both permanent and stationary, such as houses and office buildings, and other permanent and stationary structures designed for human occupancy, including but not limited to churches, museums, gazebos, and garden pavilions. (CFR 202.11(b)(2))

The following works are not given copyright protection:

Structures other than buildings. Structures other than buildings, such as bridges, cloverleafs, dams, walkways, tents, recreational vehicles, mobile homes, and boats. (CFR 202.11(d))