How to Build a Corner Cabinet: A DIY Guide for Small Bathrooms 2026

In most homes, the bathroom isn't very large—often long and narrow. Space for fixtures, the door and window openings, the shower corner, and sometimes the washing machine leave little room for a dedicated cabinet for medicines or personal hygiene items. A corner wall cabinet can be a smart solution: it doesn't take up floor space, doesn't invade the room, and its functionality increases if the door is a framed mirror.

Building a corner cabinet doesn't require special tools, though having a table saw makes cutting parts quicker and more precise than using a handsaw. The proposed structure offers three shelves, but their number and the cabinet's dimensions can be evaluated case by case. Due to the weight of the mirror, the door is attached to the cabinet using a full-height piano hinge, while closure is achieved with two pairs of magnets applied internally at the top and bottom. Crucial for a successful corner cabinet is the correct joining of shelves to the sides using hidden dowels and glue, which requires maximum precision.

Two dowels per side for each shelf are more than enough to ensure stable assembly. Keep in mind that the two sides form an L-shape, so the holes for the dowels are equidistant from each other on both sides, but their position differs by the thickness of the wood on one side compared to the other. Browse our home improvement collection for essential tools and materials. Melamine edge banding, available in various wood tones or colors, allows you to cover the exposed edge of the wood.

If using 20 mm thick wood as in this case, it's best to get banding at least 22 mm wide and apply it so it protrudes slightly on both sides. Adhere it with a hot iron and rub it down.

What You Need to Build a DIY Corner Cabinet

• Wood (plywood or solid wood, 20 mm thick recommended)
• Melamine edge banding (22 mm wide)
• Wood glue
• Wooden dowels (8 mm diameter)
• Piano hinge (full height of the door)
• Two pairs of magnets (for closure)
• Mirror (cut to size for the door)
• Mirror adhesive or clips
• Sandpaper (various grits)
• Paint or varnish (optional)
• Tools: table saw or handsaw, drill, doweling jig, clamps, iron, screwdriver

For all your supplies, check out home improvement essentials and bathroom vanities for inspiration.

Designing a Corner Cabinet

Start by measuring your available corner space. The cabinet's depth and height depend on your needs. A typical design has two sides forming a 90-degree angle, with shelves connecting them. Plan the number of shelves—three is standard for a bathroom cabinet. The door should be slightly larger than the opening to overlap the frame. If using a mirror, ensure the door is sturdy enough to support its weight. Consider adding LED strip lighting inside for better visibility.

Cut List Example (for a 60 cm tall cabinet)

• Side panels: 2 pieces, each 60 cm x 30 cm (cut at 45° angles for the corner joint)
• Shelves: 3 pieces, each triangular or custom shape to fit the L-shape
• Door: 1 piece, slightly larger than the front opening
• Back panel (optional): thin plywood for dust protection

Building the Corner Cabinet

Cut all wood pieces according to your design. For the sides, cut them with a 45° bevel on the back edge so they fit together perfectly in the corner. Use a doweling jig to drill holes for the dowels on the side panels and shelf edges. Apply wood glue to the dowels and holes, then assemble the sides and shelves. Clamp everything together and let it dry for at least 24 hours. After assembly, sand all surfaces smooth. Apply wall decor or paint to match your bathroom style.

Edge Banding Application

Apply melamine edge banding to all exposed edges using a hot iron. Trim the excess with a utility knife and sand lightly for a smooth finish. This step gives the cabinet a professional look.

Assembly and Finishing

Attach the piano hinge to one side of the cabinet and the door. Install the magnets on the opposite side—one pair at the top and one at the bottom. Attach the mirror to the door using mirror adhesive or clips, ensuring it's centered and secure. Mount the cabinet to the wall using sturdy brackets or screws into wall studs. For a cohesive look, coordinate with decorative mirrors from our collection.

Tips for a Professional Finish

• Use a level to ensure the cabinet is perfectly horizontal when mounting.
• Pre-drill holes for screws to prevent wood splitting.
• Add soft-close hinges for quiet operation.
• Seal the wood with varnish if using in a humid bathroom.

Frequently Asked Questions

1. Can I build this cabinet without a table saw?

Yes, you can use a handsaw or circular saw with a guide. However, a table saw ensures precise 45° cuts for the corner joint.

2. What type of wood is best for a bathroom corner cabinet?

Plywood with a moisture-resistant core or solid wood like oak or teak works well. Avoid MDF in damp areas unless sealed properly.

3. How do I ensure the door closes properly?

Use strong magnets aligned correctly. Test the closure before final mounting and adjust the magnet positions if needed.

4. Can I add shelves after building the cabinet?

It's easier to add shelves during initial assembly. If retrofitting, use shelf pins or brackets that attach to the side panels.

5. What size mirror should I use?

Cut the mirror to match the door size, leaving a small border if desired. For safety, use tempered glass.

For more DIY inspiration and supplies, explore home improvement, bathroom vanities, lighting, mirrors, wall decor, storage benches, outdoor patio furniture, garden supplies, kitchen islands & carts, dining tables, sofas, beds, rugs, curtains, desks & work surfaces, office chairs, sheds, greenhouses, pergolas, gazebos, BBQ grills & outdoor cooking supplies, outdoor heating, outdoor lighting, TV & entertainment furniture, bookcases & shelving units, display shelving & etageres, nightstands, dressers, and mattresses.

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