I normally ask the customer what year the house was built. I've found that in my service area, 1968 was pretty much the last year the craftsmen were in town. By 1974 the shysters were doing all the work, and they were using all the substandard products they could find. I hate tree farm trees, ever-shrinking lumber dimensions, vinyl siding and soffits, plastic foundation and ridge vents, OSB, lazy/crooked building inspectors, and don't-give-a-dam general contractors who don't bother to look at what their subs are doing. But I guess if they were building them like they did in the good ol' days, the phone wouldn't ring 100X/wk.
I got hired to handle critter issues in a model home that was rented (all the models were rented) when the market tanked. Rest of subdivision was just unsold lots. Anyway, this two year old model house had 6 different species of wildlife infesting the attic. I removed the juvenile squirrels from the insulation nest in the eave from the outside. Yep, the construction gap was big enough for my fist full of squirrel. Tried to explain the reason for the infestation to the GC so he could address the problem with his trim carpenter subcontractor when they started building again, but he wasn't interested. In so many words he told me to mind my own business. He failed to realize that IS my business.