Depends on the house and price point. We build a bunch of cheap raised ranch's, and they have very simple roofs, which are cheap to build. A large colonial can have a more complicated roof due to dormers ect. Depends on the style and price point of the house. Style costs money, building a box is cheap.

I went to a building inspection on a large turn of the century house, it was kind of a federal style. Anyway the roof was complicated as can be and slate. Slate roofs are freaken expensive to replace, at least they last a long time!

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200