A standard staircase is built depending upon spacial constraints and the floor plan. Typically, this includes plywood covered with carpet. If you have your hearts set upon solid wood treads, then say so! We would love to be able to create your dream home and settle your hopes and dreams!
Can lights themselves are inexpensive to go out and purchase at a hardware store, but the wiring them up and installing them is quite the feat. If you are thinking you may want another light above your tub, tv, kitchen, etc., now is the time to add it.
3) Shower niches
Since this is a framing detail, it will be nearly impossible to add later on without ripping apart and gutting your entire bathroom! If you think you would rather a niche than a shower shelf, then go for it. It will be specifically planned for your home and integrated structurally.