Are you looking to maximize the storage capacity of your Billy bookcase from IKEA? While it's designed to be a compact and space-saving solution, there are ways to make it deeper to accommodate more items. In this guide, we'll explore how to extend the depth of your Billy bookcase, step by step, while ensuring it remains stable and secure.

Understanding the Billy Bookcase Dimensions

Before we begin, let's understand the standard dimensions of the Billy bookcase. The most common size is 31.5" (W) x 78.75" (H) x 11.75" (D). The depth of 11.75 inches is what we'll be increasing in this guide.
Materials Needed

- Two Billy bookcases (to create a deeper unit)
- Four 1x2 inch wooden boards (for the new back and sides)
- Wood glue
- Screws (1.5" and 2.5")
- Drill and driver bits
- Saw (hand saw, miter saw, or circular saw)
- Clamps
- Sandpaper (120-grit)
- Paint or stain (optional, to match your Billy bookcase)
Step-by-Step Guide to Make Billy Bookcase Deeper

Measure and Cut the Wood
First, measure and cut the 1x2 inch wooden boards to the following dimensions:
| Part | Length | Width |
|---|---|---|
| Back | 78.75 inches | 11.75 inches |
| Sides | 31.5 inches | 11.75 inches |

Assemble the New Back and Sides
Using wood glue and clamps, attach the back and side pieces together. Ensure the sides are flush with the back piece. Allow the glue to dry according to the package instructions.
Disassemble the Billy Bookcases

Carefully disassemble both Billy bookcases using a drill. Keep all the screws organized for reassembly.
Reassemble the Bookcases with the New Back and Sides


















Start by attaching the new back and side pieces to one of the bookcases using 1.5" screws. Ensure the back piece is flush with the bottom and top of the bookcase. Then, attach the other bookcase to the new side pieces using 2.5" screws.
Sand and Finish
Sand any rough edges with 120-grit sandpaper. If desired, paint or stain the new wood to match the color of your Billy bookcase.
Reassemble the Bookcases
Reassemble the bookcases using the original screws. Ensure all shelves and doors are properly aligned and functioning.
Tips for Stability and Safety
- Always secure the bookcase to the wall using wall anchors and screws to prevent tipping.
- Do not overload the shelves. Distribute weight evenly.
- Regularly check the stability of the bookcase and tighten any loose screws.
By following these steps, you'll have successfully extended the depth of your Billy bookcase, providing you with more storage space. Enjoy your new, deeper bookcase!