Site-built shelves work well because they allow you to adapt shelf size to the space available, making it easier to use the space more efficiently. The necessary materials should be available at your local hardware store, home center, and/or lumber yard.
Now look at the top shelf. Run all of your smaller sized books side by side across the top shelf. If you have multiple book cases side by side, run these books across all of them. The books should be all the same height if you can. And idealy they should run the complete width of the shelf. This will give a visual frame to the book shelf.
Consider where and how you will use your shelving with baskets before you buy. Would the needs of your family best be met using a set of tall bookcase shelves with lots of storage, medium-sized shelving with baskets, or basket benches that can add more seating area to your living space?
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