How to build a wavy bookshelf

Start by measuring the space where your wooden bookshelf will go. This will help determine the overall height and width of your build. For this project, the bookshelf will stand 1400mm high. Once you’ve decided on your dimensions, cut your panels to size using a mitre saw. Double-check all measurements before cutting to ensure your panels are consistent and accurate.

Now it’s time to give your bookshelf its signature look. Take one of the panels and divide it into three equal vertical sections. Use a large bucket to sketch out wide, flowing half circles along one edge, and a smaller tin to connect them and create a smooth wave pattern. Alternatively, you can freehand the curve—just start with a light pencil sketch and adjust until you’re happy with the shape. The more balanced and even your curves are, the more polished the final bookshelf will look.

Note: Cut your first wooden panel first, and use it as a template to trace the same wave onto the remaining panels for consistent shaping. As you trace each new panel, trim 50mm from the width to gradually reduce the size of each shelf. This stepped effect adds to the sculptural look of the bookshelf and ensures the shelves taper nicely from back to front. 

With the wave shapes marked, use a jigsaw to carefully cut along the curves. Take your time and follow the lines as smoothly as possible for the cleanest finish. Keep your cuts steady, especially around tight bends, to avoid jagged edges. Once all the wooden  panels are cut, you’re ready to smooth them out. Sand along the curves with medium-grit sandpaper to remove roughness or uneven cuts, then switch to fine-grit for a polished, splinter-free edge. A well-sanded panel not only looks better but makes the final assembly safer and more professional.

With your panels shaped and smoothed, it’s time to cut the notches that allow the bookshelf pieces to interlock. These cross half joints will be made where the curved shelves meet the vertical panels, helping the structure hold together securely.

Begin by marking out the book shelves shelf positions, spacing them evenly for both strength and appearance. The width of each notch should match the thickness of your timber—for example, 18mm plywood will need 18mm-wide notches. The depth of the notch should go halfway through the panel so the pieces slot together flush. 

Use a mitre saw to make the two vertical cuts that form the sides of each notch. Be sure to line up the blade carefully with your pencil marks and keep each cut straight and square. Once both sides of the notch are cut, switch to a jigsaw to remove the centre section between them. This involves cutting across the grain at the base of the notch to free the middle piece. Go slowly and keep the jigsaw blade level to avoid digging in or overcutting. If needed, clean up the inside edges with a chisel or some sandpaper for a more precise fit. Taking your time here will make a big difference when it comes to assembling the panels neatly and securely.

Once all notches are cut, test-fit the pieces. If they’re too tight, lightly sand the edges until they slide in firmly but smoothly. This step is key to making sure your bookshelf fits together neatly and stays solid.

Before putting everything together, it’s a good idea to paint or varnish the panels. This is much easier to do while the pieces are still separate, allowing you to reach all edges and curves. Let the finish dry completely according to the product instructions before moving on to the next step.

Once the finish is dry, start assembling your bookshelf by applying wood adhesive to each joint. Carefully interlock the panels, wiping away any excess wood glue with a damp cloth. Check that everything is square using a carpenter’s square. If anything is slightly out of alignment, adjust the panels before the adhesive sets.

To reinforce the structure, you can also add brackets to the back of the bookshelf, especially where curved and straight panels meet. Secure all joints using screws, starting near the front of the top shelf. For a clean, professional look, apply wood filler over any visible screw heads once they’re in place.

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