What is a good lumber for framing a residential ADU?

[Bruce P.]

Hi,

My friend is building an ADU (accessory dwelling unit) in their backyard in Los Angeles area and wondered what kind of lumber is good for the framing both in terms of price and quality? They are in a class B+ to A neighborhood. I read up on it a bit and it seems like light structural lumber milled from softwood trees (spruce, fir and pine) might be a fine choice. But there any good brand(s) (model number, SKU, etc.)  I can ask for when making inquiries to a vendor so that they could easily point me in the right direction?  Thanks BP community in advance.