Window seats are wonderful. Not only do they offer storage and a cozy place to curl up and read, they look great, too, especially when you build in a bookshelf on either side to create a niche for the window seat.
You’ll need to be sure that your window seat won’t cover or otherwise interfere with a heating or cooling vent in the floor. If so, you’ll need to extend the heating duct out far enough to clear the window seat and install a new floor register.
Once that potential problem is overcome, measure the window and decide how high you want the bookcases to be. They look especially nice if they are tall enough to reach the ceiling and you finish them with crown molding.
This doesn’t have to be a difficult job. In fact, you can use ready-made kitchen cabinets secured to both a bottom frame built of 2 x 4s or 2 x 6s and the wall. These don’t have to be all that expensive, either, especially if you plan to paint them. You can also run a shelf over the top of the window from one bookcase to the other. This makes an excellent display area for collectibles, which gives a very “finished” feel to the design.
Once the seat, bookshelves and frame are done, simply buy a foam cushion for the seat itself, cover it with the fabric of your choice and you’re done!