Window seat with built-in bookshelves. Could use IKEA: Hemnes daybed kitchen pullouts each), and Billy bookcases each or with uppers each). Total cost with knobs, trim, paint, etc. would be about The skylight is a nice touch too!
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Even a little more space extended by a self-storage unit can make life easier on a day-to-day foundation for the majority of homeowners. You is going to be the only one with a key to your storage facility. In place of getting rid of things which you may need, think about putting them in a self storage unit.