I second the bookcases, though they don’t all have to be in the same room – we have shelves in a basement room where I have books arranged by time periods or subjects for all the overflow, and keep upstairs only what we use regularly. We keep our history and literature books on shelves beside the fireplaces, and the children have bins for their individual subjects. My teacher’s guides are on a smaller shelf in the dining room. If I were building something in, I’d look at the area I planned to use most, and plan in a few covered storage areas for books, guides, etc, or find some funky old pieces to double as school storage; a giant antique buffet that was likely part of a country store is now a counter/craft/coffee cupboard.
What works for us? Wallspace. We sort of “house-school” rather than having a schoolroom, and don’t mind living with our schooling. If that is an issue, she might want to plan a space more out of sight. Our dining area sports a large, laminated world map, paintings from our picture study artist, and children’s artwork. It is amazing, by the way, the conversation these things have sparked with dinner guests, particularly the world map.
What would I change? I’d love to have a more organized (and out of my way) area to keep the children’s individual school bins – right now they’re in my pantry (a space I could really use for food and appliances!). And I’d sure like more bookcases, LOL…