Windows in new construction within an historic district should be appropriate for the building and in most cases generally consistent in character with the windows found in the historic district.
Windows should generally be made of the materials characteristic of similar building types within the historic district.
This guidance is intended to promote design compatibility with historic buildings and districts, rather than to discourage good contemporary design or creative architectural expression.
D.C. Mun. Regs. tit. 10, r. 10-C2312