Discover the versatility and functionality of IKEA's BILLY bookcase system with our comprehensive guide on BILLY combinations. Whether you're looking to maximize storage, create a unique room divider, or build a custom home office, we've got you covered.

Why Choose IKEA BILLY?

The BILLY bookcase is a timeless design that has been a bestseller since its introduction in 1979. Its popularity lies in its modular design, affordability, and endless customization possibilities. With BILLY, you can create a storage solution that's tailored to your specific needs and space.
Understanding BILLY Dimensions

Before we dive into BILLY combinations, let's quickly go over the standard BILLY bookcase dimensions. The BILLY has a depth of 21.5 inches, a height that ranges from 31.5 to 71 inches, and widths that vary from 11.5 to 58.75 inches. These dimensions provide a solid foundation for creating your perfect BILLY combination.
Standard BILLY Bookcases

- BILLY 403.385.83: 11.5" W x 31.5" H x 21.5" D
- BILLY 403.385.84: 17.75" W x 31.5" H x 21.5" D
- BILLY 403.385.85: 23.63" W x 31.5" H x 21.5" D
- BILLY 403.385.86: 29.5" W x 31.5" H x 21.5" D
- BILLY 403.385.87: 35.4" W x 31.5" H x 21.5" D
- BILLY 403.385.88: 41.3" W x 31.5" H x 21.5" D
- BILLY 403.385.89: 47.25" W x 31.5" H x 21.5" D
- BILLY 403.385.90: 53.25" W x 31.5" H x 21.5" D
- BILLY 403.385.91: 58.75" W x 31.5" H x 21.5" D
Taller BILLY Bookcases
- BILLY 403.385.92: 17.75" W x 71" H x 21.5" D
- BILLY 403.385.93: 23.63" W x 71" H x 21.5" D
- BILLY 403.385.94: 29.5" W x 71" H x 21.5" D
- BILLY 403.385.95: 35.4" W x 71" H x 21.5" D
- BILLY 403.385.96: 41.3" W x 71" H x 21.5" D
- BILLY 403.385.97: 47.25" W x 71" H x 21.5" D
- BILLY 403.385.98: 53.25" W x 71" H x 21.5" D
- BILLY 403.385.99: 58.75" W x 71" H x 21.5" D

Creative BILLY Combinations
Now that you're familiar with the standard BILLY dimensions, let's explore some creative BILLY combinations to inspire your next project.
Room Dividers

Create a room divider by combining tall and standard BILLY bookcases. For example, you can use two BILLY 403.385.92 (17.75" W x 71" H) on either side of a BILLY 403.385.84 (17.75" W x 31.5" H) in the middle. This combination will create a functional and stylish room divider that adds storage and defines your space.
Home Office















Design a custom home office by combining BILLY bookcases with other IKEA products like the LINNMON tabletop and ADILS legs. For instance, you can create a standing desk by attaching a LINNMON 801.452.25 (47.25" W x 23.63" D) tabletop to two ADILS 203.386.57 (28.5" H) legs and placing it on top of two BILLY 403.385.94 (29.5" W x 71" H) bookcases. This combination will give you a spacious work surface and ample storage for your office supplies.
Built-in Bookcases
Create a built-in look by combining BILLY bookcases with IKEA's KALLAX or STUVA storage units. For example, you can use two BILLY 403.385.87 (35.4" W x 31.5" H) bookcases on either side of a KALLAX 208.966.60 (31.5" W x 13.75" H) storage unit to create a seamless, built-in bookcase that maximizes your wall space.
BILLY Accessories for Customization
To further customize your BILLY combinations, consider using IKEA's range of BILLY accessories. Some popular options include:
| Product | Dimensions | Purpose |
|---|---|---|
| BILLY Bookcase Extender | 15.75" W x 11.8" H x 11.8" D | Adds an extra shelf to your BILLY bookcase |
| BILLY Corner Shelf | 11.8" W x 11.8" H x 11.8" D | Creates a corner shelf for added storage |
| BILLY Shelf Insert | 11.8" W x 11.8" H x 11.8" D | Divides a BILLY shelf into smaller compartments |
| BILLY Door | Varies by BILLY model | Adds doors to your BILLY bookcase for a closed storage solution |
With these accessories, you can truly make your BILLY combination your own and tailor it to your specific storage needs.
Tips for Building Your BILLY Combination
Before you start building your BILLY combination, here are some tips to keep in mind:
- Measure your space carefully to ensure your combination will fit perfectly.
- Consider using a level and a tape measure while building to ensure your bookcases are straight and aligned.
- If you're creating a tall BILLY combination, consider securing the bookcases to the wall for stability using IKEA's ANKLIT or TYLÖS brackets.
- Don't be afraid to get creative with your combination! The beauty of the BILLY system is its versatility.
We hope this guide has inspired you to create the perfect BILLY combination for your home. Happy building!