A two-car garage, a workshop, a warehouse bay — large open rooms break the habits you built scanning bedrooms. The sensor has a working range, and in a big room the far wall may simply be out of it.
Walk the perimeter, do not stand in the middle
In a small room you can stand near the center, turn, and capture everything. In a large one that puts every wall at the edge of range and returns a thin, noisy capture. Instead, walk the perimeter at a comfortable distance from the walls and let each wall be properly seen up close.
The rule of thumb: if you can throw a tennis ball at a wall and not be confident you would hit it, you are too far away to scan it well.
Clutter is the normal condition
Shops are full of benches, racks, and a car. Same approach as a furnished house: capture the wall above the obstruction, keep walking, and note the covered runs out loud. A garage with shelving along one wall is a garage with one wall you should say something about.
Height matters more here
Garages and shops often have taller walls than living space, sometimes with an open truss ceiling. Sweep upward deliberately — a wall captured only to eight feet in a twelve-foot shop gives you two-thirds of the wall area you were trying to price.
Garage conversions
The common job. What a scan hands you: footprint, wall area, ceiling height, and the opening where the garage door is — which is most of a conversion bid. What to note yourself: the slab's condition and whether it steps down from the house, since that step is the thing that decides the floor framing.
The door itself
A garage door is a large opening the scan will treat as a wall feature. Measure its width and height directly if you are replacing it.
Big rooms are not harder. They just need you to walk more of them.