The most common surprise on a house this age is discovering the original opener bracket was mounted for a lighter door than the new one weighs, which means added strut and sometimes a bracket relocation we didn't price until we had the door off. Less common but it happens: stucco or trim around the opening was finished tight to the old frame, so a different door profile needs minor trim work to close the gap cleanly. We'll flag either of these before we commit to a price, not after. One limitation worth saying plainly: we travel to Brea from Fullerton, about 4 miles off, so we don't hold same-day emergency slots here the way a shop based in town might - installs get scheduled, not walked in on.