Yes, in measurement before anything else. Carriage-house openings were built for carriages: widths, headroom, and framing differ from modern standard openings, and the doors in them are often nonstandard sizes or long discontinued. A repair that assumes standard parts can fail on fit alone. The honest sequence is measure the opening and the door, check whether the manufacturer still supports the sections, and only then price repair against a replacement measured to the opening. On the oldest downtown stock, that measurement visit is the job's foundation, and a quote given without it is a guess wearing a number.
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