Brooklyn has several historic districts, including Park Slope, Brooklyn Heights, and Fort Greene, and buildings in these areas need Landmarks Preservation Commission review for any exterior window work. Brownstones and other older buildings often have window openings that don't match today's standard sizes either, which affects both what fits and how it gets installed.

Co-op and condo buildings usually need board approval too, so we check what applies to your building first, whether that's a historic district review, a board sign-off, or both. The same kind of review comes up in Manhattan and parts of Queens, just with different local boards handling it.