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Install White Built-In Bookcases Around a Window

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Built-In Bookcases: DIY Before and After by Linn

Linn’s built-in bookcase project is a perfect example of how converting freestanding bookshelves into attached architecture can completely refresh a room. The transformation adds visual height, increased storage, and a feeling of permanence that furniture alone often can’t achieve. Below is Linn’s account of the process and a few practical observations for anyone considering a similar DIY built-in shelving project.

From Idea to Installation

“I wanted to share a before-and-after of the custom built-in bookcases my husband and I constructed. Our old bookcases weren’t working—both in appearance and in the amount of practical storage they provided. Instead of paying for a professional custom build, we decided to tackle the project ourselves.”

Before photo of room with short bookcases

Linn notes that built-ins introduce a cozy, intentional look. They framed the space and made the room feel more finished. The couple designed and built two large units, assembling the main structures outside in their carport workshop, painting them white, and then bringing the pieces inside to install around the window.

Wooden built-in bookcase structure being prepared

Materials and Finishing Touches

For the backing, Linn used beadboard, a classic choice that adds texture and visual interest to shelving. The beadboard creates dimension behind books and decor and helps the installed unit read as an integrated architectural element rather than a row of floating shelves.

Beadboard backing on built-in shelves

The finishing process—attaching moldings, filling seams with caulk, and applying final paint—took longer than expected. That’s a common experience: rough carpentry comes together relatively quickly, but the trim, caulking, and painting that make a project look professional require patience and attention to detail.

Installing molding on built-in bookcases

Results and Practical Benefits

“Now these built-in shelves look great in our space and we can fit so many more books, which was the main reason we built these units in the first place,” Linn writes. The finished units not only increased storage capacity but also visually extended the room. Reaching the ceiling with tall built-ins draws the eye upward and helps a space feel larger and more open.

Finished built-in bookcases around a window

Tips for DIY Built-In Shelving

  • Break the project into manageable steps: build the main boxes, paint them, install the backing, then add trim and finish work.
  • Beadboard or paneled backing instantly elevates the look and adds depth behind books and accessories.
  • Take time on the finishing stages—filling gaps, caulking seams, and trim installation are what give built-ins a professional finish.
  • If full custom construction feels intimidating, consider starting with off-the-shelf bookcases and integrating them with added trim and molding to achieve a built-in appearance.
  • Painting units before installing them can make the overall process easier, especially when working with large pieces in a small room.

Learn More

If you’d like to read more about Linn’s building process or see additional photos, look for her detailed project notes on her blog under her home project series. Her write-up includes helpful firsthand insights that may inspire your own built-in shelving project.

Note: Linn’s project also sparked a small community giveaway mentioned in the original post; check the original source if you are following that promotion.

Built-in bookcases are a rewarding weekend-to-weeksend project depending on scope—when done well, they add storage, visual height, and character to any room.