How to build a corner bookshelf
To build a corner bookshelf, you’ll cut wood to create two sides that meet at a 90-degree angle. Assemble these sides, add shelves, and secure to the wall. Measure carefully, use appropriate fasteners, and ensure stability. This guide provides the steps and common pitfalls to avoid for a successful project.
Building a corner bookshelf is a rewarding DIY project that maximizes space and adds a custom touch to your home. This guide assumes basic woodworking knowledge and tools. You can adapt these steps for a freestanding unit or one built into the corner.
Before you begin, decide on the dimensions. A standard height might be 6 to 7 feet (183-213 cm), with shelves spaced 10-12 inches (25-30 cm) apart. The depth will depend on your corner and the width of the shelves. For a typical 90-degree corner, you’ll be working with two adjoining walls.
Gather your materials. You’ll need lumber (1×10 or 1×12 pine boards are common choices), wood screws (1 1/4″ and 2″), wood glue, sandpaper, and your preferred finish (paint or stain). For tools, you’ll need a tape measure, pencil, saw (miter saw or circular saw recommended), drill, level, and safety glasses.
Measure and cut the side pieces
The key to a corner bookshelf is the two side panels that will meet at the corner. Measure the height you desire for your bookshelf. For each of the two side panels, you will cut one piece of lumber to this height. For instance, if you want a 7-foot tall bookshelf, cut two boards to 7 feet.
Next, you need to cut the top and bottom pieces. These will form the horizontal supports. For a 12-inch deep shelf, you’ll need two pieces that are 12 inches long for the top and two for the bottom. If you are building a unit that goes from floor to ceiling, you might only need top and bottom braces to secure it.
Crucially, you need to cut the shelves. The length of each shelf will depend on how far out from the corner you want them to extend. For a bookshelf that is 12 inches deep, the longest point of the shelf will be 12 inches. However, the shelf itself will be cut at an angle to fit the corner. A simple way to get the correct length is to measure 12 inches along each wall from the corner, then measure the distance between those two points. This will give you the length of the front edge of your shelf. You’ll then need to cut the shelves to this length, often with a slight angle on the back edges to sit flush against the wall.
Assemble the bookshelf frame
Start by attaching the top and bottom pieces to one of the side panels. Apply wood glue to the edges of the side panel where the top and bottom pieces will connect. Then, use 2-inch wood screws to secure them. Ensure everything is square and flush.
Repeat this process for the second side panel. You will now have two separate ‘L’ shaped structures if you are building a unit that does not span the full corner height. If you are building a unit that spans the full corner, you will have two vertical panels with horizontal supports attached.
Connect the two side panels. If you are building a freestanding unit, you will attach the shelves between the two side panels. If you are building a unit that spans the corner, you will attach the second side panel to the existing horizontal supports. Use wood glue and 2-inch screws for strong joints.
Install the shelves
Mark the positions for your shelves on the inside of both side panels. Use a tape measure and a level to ensure they are perfectly horizontal and evenly spaced. A common spacing is 10-12 inches between shelves, but this can be adjusted for the size of your books.
Cut your shelves to the correct length and width. Remember, the shelves will be at an angle to fit the corner. For a 12-inch deep shelf, you’ll likely need to cut them so the longest point is 12 inches from the wall. The exact angle and cut will depend on the width of your side panels and how they meet.
Attach the shelves. Apply wood glue to the ends of each shelf and to the marked lines on the side panels. Position the shelves and secure them from the outside of the side panels using 1 1/4-inch wood screws. Pre-drilling pilot holes will prevent the wood from splitting. If your shelves are long, consider adding a center support from underneath later for added stability.
Finishing and securing the bookshelf
Once the bookshelf is assembled, sand all surfaces smooth. Start with a coarser grit sandpaper (around 80-120 grit) to remove any rough spots or pencil marks, then move to a finer grit (180-220 grit) for a smooth finish.
Apply your chosen finish. This could be a coat of primer followed by two coats of paint, or a wood stain followed by a clear topcoat. Allow each coat to dry thoroughly according to the manufacturer’s instructions.
For safety and stability, especially if you have children or live in an earthquake-prone area, secure the bookshelf to the wall. Use L-brackets or furniture straps to attach the top of the bookshelf to wall studs. Ensure the bookshelf is level before securing it.
Common Mistakes When Building a Corner Bookshelf
| Step | Typical Mistake | How to Avoid It |
|---|---|---|
| Measuring and Cutting | Incorrect shelf length/angle | Measure twice, cut once. Use a speed square or protractor to ensure accurate angles for corner fitting. Account for the thickness of the side panels when calculating shelf length. |
| Assembly | Uneven or wobbly frame | Use a level and square throughout the assembly process. Pre-drill pilot holes for screws and use wood glue for stronger joints. Ensure all pieces are flush before screwing. |
| Shelf Installation | Shelves not level or unstable | Mark shelf positions precisely using a level. Ensure shelves are cut to the correct length to fit snugly. Use adequate screws and consider adding support brackets or a central support for longer shelves. |
| Finishing | Sanding marks or uneven finish | Sand in the direction of the wood grain, progressing from coarser to finer grit. Wipe away dust between coats. Apply finish in thin, even coats. |
FAQ
What type of wood is best for a corner bookshelf?
Pine is a popular choice for DIY bookshelves due to its affordability and ease of use. For a sturdier build, consider hardwoods like oak or maple, though they are more expensive and harder to work with. Plywood can also be used for shelves.
How deep should the shelves be?
Shelf depth typically ranges from 10 to 12 inches (25-30 cm). This is usually sufficient for most standard-sized books. You can adjust the depth based on the size of the corner and the types of items you plan to store.
Can I build a corner bookshelf without it being attached to the walls?
Yes, you can build a freestanding corner bookshelf. However, for stability and safety, especially for taller units, it is highly recommended to anchor it to the wall using L-brackets or furniture straps to prevent tipping.
What is the best way to join the two sides of the bookshelf in the corner?
The two sides of the bookshelf are typically joined by the shelves themselves, which span across the corner. You can also add a vertical support piece at the very back of the corner, but this is often unnecessary if the shelves are well-secured to both side panels.