This window seat, for example, was made from four prefinished, white American Woodmark cabinets and their coordinating trim boards, all sold at Home Depot. The 18-inch-deep-by-24-inch-high cabinets are typically used above refrigerators. Here are the steps to follow to re-create this seat at your house.
1. Use 2x lumber cut to size to construct a 4-inch-tall, U-shaped platform on which the two-door center cabinets and single-door end cabinets will sit. Secure the platform to the floor by driving screws at an angle through its outer framing.
2. Arrange the center cabinets side by side on the platform and drive 2-inch wood screws through their adjoining side panels. Then align the end cabinets corner to corner with the center ones. Make room for the doors to open where the cabinets intersect by screwing 3-inch filler strips to the center cabinets' face frames. Then secure the end cabinets directly to the filler strips, using 2½-inch wood screws.
3. Anchor the entire unit to the back wall by driving 2-inch deck screws through the cabinets' rear panels, making sure to sink the screws in studs.
4. Hide the platform with toekick molding secured with 1-inch finish nails.
5. Fasten wood cleats to the wall in the open corners to support the ¾-inch-thick-by-19-inch-deep end panels used to create a sturdy top for the window seat. Secure the center panel to the cleats and the side panels to the end cabinets below using 1 ½-inch wood screws. Finish the top's outer edge with trim attached with finish nails. Add a custom cushion, and take a load off.
This was done by taking the pull-out mechanics from an old couch and screwing it into the wall. A job for your carpender but genius!