Almost everything except the name. Carriage house openings were built for carriages and early cars: narrower, shorter, and lower in headroom than a modern garage, often with the original opening's framing still setting the dimensions. Modern sectional doors can be fitted, but the constraints choose the hardware: jackshaft openers that mount on the wall instead of a ceiling rail, low headroom track, and panels sized to the opening rather than cut down from a standard door and hoping. The other difference is the house's face: in the Highlands the carriage door is part of the architecture, and carriage style replacement doors exist precisely for these openings. The honest first step is a measurement visit, not a catalog: what fits your opening decides the menu.
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