The IKEA BILLY bookcase is one of the most recognisable pieces of furniture in the world. Since its launch in 1979, it has become a staple in homes across the UK, valued for its simple design, modular flexibility, and affordable price. Whether you need a slim unit for a narrow hallway, a wide wall of shelving, or a custom built-in look, the BILLY system offers a range of sizes and accessories that can be adapted to almost any space.
This guide covers the standard UK dimensions, door options, popular DIY hacks, and the key facts you need to plan your own BILLY setup. All information is drawn from official IKEA UK sources and verified community reports.
What Sizes Does the IKEA BILLY Bookcase Come In?
| Feature | Details |
|---|---|
| Sizes | 80×28×202 cm (standard) to 40×28×106 cm (small) |
| Colours | White, Black, Birch effect, Oak effect |
| Door Options | OXBERG (glass/panel), TYSSEDAL (panel) |
| Top Hacks | Built-in look, home office desk, display cabinet |
- The BILLY bookcase has been an IKEA bestseller for over 40 years due to its simple, modular design.
- Adding OXBERG doors is the most popular official modification, turning open shelves into a closed cabinet.
- DIY communities have created thousands of ‘hacks’ to transform BILLY into custom built-in furniture.
- Despite its popularity, official documentation on door compatibility across all size variants is poor.
- For small spaces, the 40×28×106 cm unit is the most compact option, often expanded vertically with extension units.
| Attribute | Value |
|---|---|
| Designer | Gillis Lundgren |
| Launch Year | 1979 |
| Material | Particleboard, paper foil, plastic edging |
| Price Range (UK) | £35 – £65 (standard units) |
| Best Seller | White, 80×28×202 cm (Article 00263850) |
Can You Add Doors to an IKEA BILLY Bookcase?
IKEA UK sells BILLY doors separately, and also offers pre-combined BILLY / OXBERG units with doors. The addition of doors changes the depth of the unit from the standard 28 cm to 30 cm or 41 cm, depending on the door style. This is an important consideration when planning placement near radiators or in narrow hallways.
What Is the BILLY / OXBERG Bookcase With Doors?
The BILLY / OXBERG combination is a complete bookcase with doors already attached. Available in the UK in sizes such as 80×30×202 cm and 80×41×202 cm, these units provide a cleaner, dust-free look. The buying guide also lists a BILLY bookcase with glass door at 80×30×202 cm, sold as one piece.
Where to Buy BILLY With Doors in the UK
You can purchase BILLY / OXBERG units directly from IKEA UK stores and online. The official website also sells OXBERG doors separately, allowing you to add them to an existing BILLY frame. It is worth checking the compatibility details for your specific width and height.
Open BILLY has a depth of 28 cm. With panel or OXBERG-style doors, depth increases to 30 cm. With glass doors, depth reaches 41 cm. Always measure before installation.
What Are the Best BILLY Bookcase Hacks for a Home Office Desk?
DIY communities have developed several ways to turn a BILLY bookcase into a functional home office desk. The most common approach uses two or more tall units placed side by side, with a worktop laid across them. The key is to ensure the units are properly anchored to the wall and that the worktop is supported evenly.
How to Build a Desk With a BILLY Bookcase
Start by measuring your wall width and ceiling height. Choose the number of 40 cm or 80 cm units that fit the space. Secure the bookcases to the wall with brackets or fixings. Then add a solid worktop – often a laminate countertop or a piece of plywood – across the top of the units. Some DIYers also add a back panel for stability.
How to Make a BILLY Bookcase Look Built-In
A popular hack involves placing multiple BILLY units side by side, anchoring them to the wall, and then adding timber or MDF trim to close gaps. Typical steps include adding plywood strips, skirting boards, and top trim to create a fitted appearance. Doors are fitted after alignment is checked. This approach gives a custom joinery look at a fraction of the cost.
IKEA does not officially recommend using a BILLY bookcase as a desk base. DIY community reports suggest it can work safely when properly anchored. Always use the supplied wall fixings and consider adding extra brackets.
How to Customize a BILLY Bookcase for a Small Space
For tight spaces, the 40×28×106 cm unit is the smallest standard BILLY. It can be used alone or combined with height extension units to reach taller ceilings. The slim 40 cm width is ideal for alcoves, narrow corridors, or under-window areas.
IKEA BILLY Bookcase Small: Options
The 40×28×106 cm version is available in white, black, and wood-effect finishes. IKEA also sells a 40×28×202 cm slim tall unit and a 40×35 cm height extension unit that pairs with the 40×202 cm bookcase. These combinations allow you to build vertical storage without taking up floor space.
Popular Hacks for Small Spaces
Common DIY solutions for small spaces include using BILLY as a room divider (with proper wall anchoring), adding doors to hide clutter, and mounting the units on castors for mobility. Some users also paint the back panel to match the wall colour, making the unit feel less intrusive.
If you plan to add doors, note that the depth increases from 28 cm to 30 cm or 41 cm. This extra depth can affect clearance in hallways, near radiators, or in tight alcoves. Measure twice before buying.
How Has the BILLY Bookcase Evolved Since 1979?
- 1979 – Launch of the IKEA Billy bookcase, designed by Gillis Lundgren.
- 1980s–1990s – Billy becomes a global bestseller; introduction of different sizes and finishes.
- 2000s – Launch of OXBERG doors for Billy; rise of online hack communities.
- 2018 – IKEA estimates over 60 million units sold worldwide.
- 2024–2025 – Continued popularity; new colours (deep green, black) and extension units released.
What Do We Know and What Remains Uncertain About the BILLY Bookcase?
| Established Information | Information That Remains Unclear |
|---|---|
| The standard BILLY bookcase (80×28×202 cm) is available in the UK. | The BILLY bookcase is made from 100% recycled materials (currently uses particleboard with recycled content, but not 100%). |
| OXBERG doors fit the 80 cm wide BILLY frames. | Official documentation on door compatibility across all size variants is poor. |
| A BILLY bookcase can be safely used as a desk base when properly anchored (based on DIY community reports). | IKEA does not officially recommend this use. |
What Is the History of the IKEA Billy Bookcase?
The IKEA BILLY bookcase is a modular shelving system that has become a design classic. Its simplicity makes it a blank canvas for both simple storage and complex custom builds. Despite its age, the BILLY system remains relevant due to continual updates – new sizes, colours, and doors are added regularly. The product’s longevity is a case study in successful modular furniture design.
For users, the main challenge is navigating the vast array of sizes, accessories, and hacks. Official documentation lags behind community innovation, so third-party guides are essential for advanced customization.
What Do Official Sources Say About the BILLY Bookcase?
The BILLY bookcase has become a beloved classic item around the world. Customise it with accessories and adapt it to your space, needs and style.
IKEA UK (official BILLY series page)
Billy (stylised as BILLY) is a bookcase sold by the Swedish furniture company IKEA. It was developed in 1979 by the Swedish designer Gillis Lundgren.
Wikipedia (IKEA Billy article)
What’s Next for the IKEA BILLY Bookcase?
IKEA may release additional door styles or extension units to compete with the growing market for hackable furniture. Expect more sustainable materials (recycled plastics, bio-based binders) in future BILLY versions. Online communities will continue to push boundaries with integrated lighting, motorized storage, and smart home features. For more details, see the IKEA BILLY bookcase sizes, door options, and DIY hacks.
Frequently Asked Questions
What are the exact dimensions of the IKEA BILLY bookcase?
The most common size is 80×28×202 cm. There are also smaller units (40×28×106 cm) and extension units (80×28×35 cm).
Can I use a BILLY bookcase as a room divider?
Yes, but it must be securely anchored to the wall to prevent tipping. IKEA recommends using the included wall anchors.
Is the IKEA BILLY bookcase easy to assemble?
Yes. It is considered beginner-friendly. Assembly typically takes 30–60 minutes with the provided hex key.
Does IKEA sell replacement shelves for BILLY bookcases?
Yes. Individual shelves and extra shelves are available for purchase on the IKEA website.
Can you paint an IKEA BILLY bookcase?
Yes, but you need to lightly sand and prime it first. Use a paint suitable for laminate surfaces for best results.
Olivia Hartley is Business & Economy Correspondent at DailyCity.co.uk, reporting on the city economy, property, retail, hospitality and employment.