Finishing a garage can mean insulation, drywall, lighting, storage, floor treatment, and ventilation while keeping it a garage. That is different from creating habitable living space, and the boundary should be explicit in the quote.
An opener replacement is a separate project from replacing the door. The price depends on the opener class, the existing door and mounting conditions, safety equipment, controls, and whether the required electrical outlet is already suitable.
Replacing a garage door is usually a package of product, removal, installation, and opening-condition work. The door itself is only one line in a quote, so two prices can describe materially different projects.
A gravel driveway is a layered, shaped, and maintained access system. Aggregate, base preparation, crown or cross-slope, drainage, compaction, delivery, and haul distance often matter more than the visible gravel price.