Three, and a good measurement visit prices all of them. First, repair and panel work on the existing door, which is viable while its model or a competent wood shop can support it. Second, a custom size modern door, which costs more than a standard unit and less than reframing. Third, reframing the opening to a standard size during a larger garage project. What is not an option is ordering a standard door against a measured assumption: in Norwalk's older detached garages the opening is the first fact, and any quote written before it is measured is a guess with a deposit attached.
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