Ask what the frame and the opening are made of before you book a measure
Two questions on the first call decide whether the appointment is worth a morning, and in this market one of them is about the wall.
Brick construction is the default here, and older brick openings are rarely a standard size. An estimator who arrives without knowing whether the wall is brick or frame is guessing at appointment length and often at scope.
Get it on the intake script. What is the exterior wall made of, how many openings are you replacing, and what is failing right now. Three questions, under a minute, and they sort a whole house job from a single stuck door before anyone drives anywhere.
Add a photo request while the caller is still on the phone. People are almost always standing near the opening when they call, and a picture texted in during the conversation is easier to get than one requested afterward.
Then act on the answers. A two opening inquiry deserves a faster and cheaper path than a whole house measure, and running both through the same appointment process is how dealers end up with estimators driving all day for jobs that will never pay for the fuel.