In my case, when I bought the house, in 2018, its purchase price represented about 30.2% of my net worth. A more important figure is how much did I borrow, as a percent of investible assets. In that case, it wasn't that much different actually, about 26.7%.
I figure the total net worth number is relatively meaningless, since it includes equity, not only in the house I bought, but also in another property I own. That equity doesn't really give me any income to live off of, to help pay the mortgage, unless I borrow against it.
Fast forward to today, and the purchase price of the house is about 24.3% of my entire net worth. The outstanding mortgage is about 20.5% of my investible asset value.