Feature Story

"Diy Bookcase Molding: Transform Your Shelves Today"

By Carol Jun 28, 2026

Transform your space with a touch of elegance and sophistication by adding DIY bookcase molding. This simple yet impactful project not only enhances the aesthetic appeal of your room but also adds value to your home. In this comprehensive guide, we'll walk you through the process of installing DIY bookcase molding, ensuring you achieve professional results without breaking the bank.

Simple Built-In Bookshelves with Crown Molding
Simple Built-In Bookshelves with Crown Molding

Why Add Molding to Your Bookcase?

a white bookcase with instructions to make it look like an empty shelf in the closet
a white bookcase with instructions to make it look like an empty shelf in the closet

Bookcase molding serves multiple purposes. It can visually elevate your bookcase, making it look more expensive and custom-built. It also helps to hide gaps and imperfections, creating a seamless, polished look. Moreover, molding can add architectural interest to your space, making it feel more cohesive and well-designed.

Materials Needed

19 Stunning Ikea Billy Library Wall Hacks For Home
19 Stunning Ikea Billy Library Wall Hacks For Home

Before you start, gather the following materials:

  • Molding (choose from materials like MDF, pine, or poplar)
  • Miter saw or miter box
  • Brad nailer or finish hammer
  • Brad nails or finish nails
  • Wood glue
  • Sandpaper (120-grit)
  • Paint or stain (optional)
  • Paintbrush or rag (for applying paint or stain)
DIY Office Built-Ins: IKEA Billy Bookcase Hack
DIY Office Built-Ins: IKEA Billy Bookcase Hack

Choosing the Right Molding

Selecting the right molding is crucial. Consider the style of your home and the bookcase itself. For a classic look, opt for crown molding or colonial-style moldings. If your bookcase has a modern or contemporary design, choose clean, simple lines.

Measuring and Cutting

a work bench with tools on it next to some bookshelves and plywood
a work bench with tools on it next to some bookshelves and plywood

Measure the length of each side of your bookcase. Cut the molding pieces using a miter saw or miter box, ensuring you make 45-degree cuts for a seamless fit. Always double-check your measurements before cutting.

Bookcase Side Molding Length
Left Height + Width
Right Height + Width
Top Width
Bottom Width

Applying the Molding

an empty room with shelves painted green and the words how to build built - in bookshelves on a budget
an empty room with shelves painted green and the words how to build built - in bookshelves on a budget

Begin by applying wood glue to the back of the molding piece. Align it with the bookcase and secure it using a brad nailer or finish hammer. Repeat this process for all four sides. Allow the glue to dry completely.

Finishing Touches

DIY Ikea Bookcase Makeover (No Powertools) - Hattie Kolp
DIY Ikea Bookcase Makeover (No Powertools) - Hattie Kolp
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a living room with pink walls and built - in bookshelves on the wall
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DeLancey DIY
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IKEA Billy Hack → Custom Built-Ins
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Billy Bookcase Closet Hacks To Maximize Storage
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Adding Moulding to Ikea Billy Bookcase
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a wooden bookcase sitting inside of a garage
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Creative Ikea Billy Hack Ideas For Every Home
380K views · 7.5K reactions | DIY Living Room Built Ins with fireplace Part 3 | By Designing | Welcome to part three my living room built ins. If you include the flooring and the fireplace build, this project has taken me just over a year to complete and I cannot wait for it to be done. Last time we left off, I had installed my cabinets and built four separate shelving units out of oak boards and I decided to stain my shelves to try to keep some natural wood on this project. I got the best looking thin plywood that I could find for the back of these shelves. I didn't want super thick plywood because then my shelves would stick out too far. I started attaching all my backs and realized very quickly that I was just building a playground attached. I also primed and painted all of these back pieces before attaching them so I wouldn't have to tape off my stained shelves to paint them later. After going through far more paint samples than I want to admit or that I ever want to see again, I finally decided on a color and went ahead and started priming and painting all of my cabinets. I usually like to prime by hand because primer can really clog up your paint sprayer and let's be honest, I just don't have my life together enough to clean my sprayer fast enough for it to not get clogged. So, I used a brush for the edges and then a foam roller for all the flat pieces to prime the cab and then I use my paint sprayer to spray the actual paint on the fronts and the backs. I attached all my shelves into the studs and the walls and now it was time to add some trim to make up for all of those uneven walls and maybe some mistakes. The one side of these shelves is exposed into the dining room so I decided to add a little bit of his shaker style trim around that side to give it a little bit more character instead of just a plain wall. Since no wall is ever straight, I had to use a level on every single one of these trim pieces to make sure that my trim was actually straight and not lining up against the wall and we'll fix that with the caulk later. Filling nail holes and caulking really isn't that bad but I was sick at the end of this project so this is probably my least favorite part of this entire process. This part and the rest of the painting really only took a couple days but since I was sick, it felt like an eternity. Now, before you come at me for painting this wood, I had to use a different type of wood on the trim pieces than I did for the shelves so if I stained them, they wouldn't match. I added battery-powered picture frame lights to the top of these units and then some gold handles to finish it all off. I am so happy to almost be done with this living room project. And I love how it turned out but I'm so ready to put my furniture back.
380K views · 7.5K reactions | DIY Living Room Built Ins with fireplace Part 3 | By Designing | Welcome to part three my living room built ins. If you include the flooring and the fireplace build, this project has taken me just over a year to complete and I cannot wait for it to be done. Last time we left off, I had installed my cabinets and built four separate shelving units out of oak boards and I decided to stain my shelves to try to keep some natural wood on this project. I got the best looking thin plywood that I could find for the back of these shelves. I didn't want super thick plywood because then my shelves would stick out too far. I started attaching all my backs and realized very quickly that I was just building a playground attached. I also primed and painted all of these back pieces before attaching them so I wouldn't have to tape off my stained shelves to paint them later. After going through far more paint samples than I want to admit or that I ever want to see again, I finally decided on a color and went ahead and started priming and painting all of my cabinets. I usually like to prime by hand because primer can really clog up your paint sprayer and let's be honest, I just don't have my life together enough to clean my sprayer fast enough for it to not get clogged. So, I used a brush for the edges and then a foam roller for all the flat pieces to prime the cab and then I use my paint sprayer to spray the actual paint on the fronts and the backs. I attached all my shelves into the studs and the walls and now it was time to add some trim to make up for all of those uneven walls and maybe some mistakes. The one side of these shelves is exposed into the dining room so I decided to add a little bit of his shaker style trim around that side to give it a little bit more character instead of just a plain wall. Since no wall is ever straight, I had to use a level on every single one of these trim pieces to make sure that my trim was actually straight and not lining up against the wall and we'll fix that with the caulk later. Filling nail holes and caulking really isn't that bad but I was sick at the end of this project so this is probably my least favorite part of this entire process. This part and the rest of the painting really only took a couple days but since I was sick, it felt like an eternity. Now, before you come at me for painting this wood, I had to use a different type of wood on the trim pieces than I did for the shelves so if I stained them, they wouldn't match. I added battery-powered picture frame lights to the top of these units and then some gold handles to finish it all off. I am so happy to almost be done with this living room project. And I love how it turned out but I'm so ready to put my furniture back.
Adding Crown Molding to the Top of Bookcases
Adding Crown Molding to the Top of Bookcases

Once the glue is dry, sand any rough edges or surfaces. If desired, paint or stain the molding to match your bookcase or the rest of your room. Allow the paint or stain to dry completely before placing books or other items on the bookcase.

Adding DIY bookcase molding is a simple yet effective way to upgrade your space. With a little time and effort, you can achieve stunning results that will impress your guests and enhance your home's value. So, grab your tools and get started on your project today!