Any reasonably recently built house should be able to handle the snow load so far. Ours was built in 76. In the early 90's we had the biggest snow year in Truckee since I've been here (89). (Not the biggest year on the summit but more big cold storms and no rain to speak of at 6K. We had 6 feet of snow on our roof--we did shovel (back then we could do it) but I don't think we needed to. All the sliding windows still worked fine.
Our deck is way overspanned--17 ft 4x8's on 2 foot centers, some of them supported at the house end only by pocket holes in the T111 siding. I used to shovel it, then I hung a plumb bob from one of the joists about a 1/4 above the ground. I decided to shovel if the plumb bob touched the ground. It's never happened. I do shovel down to the deck railing so I can see out the front windows.
I have heard of a handful of roof collapses over the years--mostly commercial buildings. Given that a lot of houses here are sporadically occupied, that most are too high and roofs are too steep for owners to shovel, and that there's no one to shovel if you wanted to, I think that speaks well of the building codes.* But do keep an eye on windows and doors opening and closing smoothly.
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