Who says clients don't pay for modeling?

[lbuttery]

Jason:

Just hire a local appraiser to do the measurements.

I have already talked to some as I can't do ladders.

You just have to make it clear that they need to measure "everything" as they are used to doing sqft only,
not how far is the window from the door how tall is the window, how wide, how far from the floor, etc.