How to Build a Small Bathroom Cabinet: Step-by-Step Guide

Mason Jul 20, 2026

Transforming a cramped small bathroom into a functional and organized space can be a daunting task. However, with the right planning and a little bit of creativity, you can significantly enhance your bathroom's storage capacity with a well-designed built-in cabinet. In this guide, we'll walk you through the process of how to build a small bathroom cabinet, making the most of your space while keeping within a reasonable budget.

Make a Super-Simple Bath Cabinet
Make a Super-Simple Bath Cabinet

Before diving into the project, it's crucial to have a clear vision of what you need from your bathroom cabinet. Consider your bathroom's dimensions, your storage requirements, and your desired aesthetic. A well-planned and measured design will ensure you create a cabinet that perfectly fits your space and serves your needs.

Bathroom Cabinet Build - An Awkard Space Turned Into Spacious Storage
Bathroom Cabinet Build - An Awkard Space Turned Into Spacious Storage

Planning Your Bathroom Cabinet

The planning phase is a critical step that sets the foundation for a successful bathroom cabinet build. It involves measuring your space, sketching your design, and selecting the right materials.

How To Build And Fix A Bathroom Cabinet
How To Build And Fix A Bathroom Cabinet

Begin by measuring the width, height, and depth of your bathroom, particularly the area where you intend to install the cabinet. Sketch a simple layout, noting the location of the sink, toilet, door, and window. Ensure your design doesn't interfere with these fixtures or your ability to navigate the space.

Determine your storage needs

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DIY Bathroom Wall Cabinet Build A Wall Cabinet, Diy Small Bathroom Cabinet, Wall Cabinet Diy, Diy Wall Cabinet Plans, Bathroom Cabinet Ideas Diy, Build Wall Cabinet, Diy Bathroom Wall Cabinet Ideas, How To Build A Bathroom Wall Cabinet, Bathroom Wall Cabinet Plans

Make a list of what you need to store in your cabinet. This could include towels, toiletries, cleaning supplies, and personal hygiene products. Group similar items together to help optimize your space and make it easier to find what you need.

Consider using basic math to help you decide on the size of your cabinet. For instance, if you have approximately 15 towels and want to store them in a drawer, you'll need about 45 linear inches of drawer space to accommodate them without crowding.

Choose the right materials

Easy DIY Bathroom Countertop Cabinet
Easy DIY Bathroom Countertop Cabinet

Select materials that align with your budget, desired look, and durability needs. Plywood is an excellent choice for the cabinet boxes due to its strength and stability. It also allows for easy customization. For the doors and drawers, consider using solid wood for a classic, timeless look or plywood if you prefer a more modern aesthetic and plan to paint or stain the finish.

Don't forget to consider hardware, such as hinges, knobs, and pulls. Opt for hardware that complements your chosen cabinet style and color scheme. Ensure you select hardware that's suited to your chosen door and drawer construction, as some require specific hardware types.

Designing Your Bathroom Cabinet

DIY COUNTER CABINET FOR EXTRA BATHROOM STORAGE
DIY COUNTER CABINET FOR EXTRA BATHROOM STORAGE

Once you've determined your storage needs and selected your materials, it's time to design your bathroom cabinet. This step involves creating detailed plans, selecting cabinet configurations, and drafting the layout.

Create detailed plans by starting with a rough sketch, then transferring your design to a drawing program like SketchUp or using graph paper if you prefer a manual approach. Include accurate measurements, cabinet configurations, door and drawer sizes, and any custom features you plan to incorporate, like built-in shelves or a trash can compartment.

Build Custom DIY Bathroom Cabinets for Storage
Build Custom DIY Bathroom Cabinets for Storage
FREE PROJECT PLAN: How to Build DIY Bathroom Storage Shelves
FREE PROJECT PLAN: How to Build DIY Bathroom Storage Shelves
Built-in Shelves for Bathroom Vanity
Built-in Shelves for Bathroom Vanity
DIY Small Floating Vanity for Bathroom
DIY Small Floating Vanity for Bathroom
an open medicine cabinet in the corner of a bathroom
an open medicine cabinet in the corner of a bathroom
the before and after pictures of built in shelving cabinets
the before and after pictures of built in shelving cabinets
For more great plans click on the banner below.
For more great plans click on the banner below.

Choose a cabinet configuration

Determine the best cabinet configuration for your space and needs. For small bathrooms, wall-mounted cabinets and tall, narrow cabinets are excellent space-saving options. Wall-mounted cabinets free up valuable floor space, while tall, narrow cabinets help make the most of high, often underutilized space. You can also mix and match configurations to create a custom layout.

Consider combining open and closed storage options to create visual interest and help you stay organized. Open shelves can showcase decorative items and make it easy to access frequently used products. Closed cabinets can hide clutter and provide a safer storage option for heavy or breakable items.

Customize your design

Incorporate custom features into your bathroom cabinet design to optimize your space and improve functionality. Some popular custom features include built-in charging stations for electronic devices, integrated lighting, and hidden compartments like a pull-out trash can or a laundry hamper.

If you plan to install a sink, you may need to adjust your cabinet design to accommodate the plumbing. Customizing the cabinet around the sink can help create a more streamlined, cohesive look in your bathroom.

Building Your Bathroom Cabinet

With your design finalized and materials sourced, it's time to start building your bathroom cabinet. Follow your detailed plans, and take your time to ensure accurate cuts and proper assembly.

Before you begin, set up a dedicated workspace with sufficient natural light and room to maneuver your tools and materials. Gather your tools, including a circular saw, jigsaw, drill, tape measure, level, and a variety of clamps. Safety gear like eye protection, gloves, and a dust mask is also essential.

Cut and assemble the cabinet boxes

Using your detailed plans as a guide, measure and cut the pieces for your cabinet boxes. Follow standard carpentry techniques to carefully assemble the boxes, ensuring they're square and stable. Use proper joinery techniques like pocket hole joints, dovetail joints, or butt joints, depending on your chosen construction method.

Assemble the cabinet boxes in your workspace, then disassemble them once they're complete. This will make it easier to transport and install the cabinets in your bathroom. If your cabinets are larger than your available workspace, you may need to assemble them in place.

Build and install the doors and drawers

Measure and cut the pieces for your cabinet doors and drawers according to your design. Ensure the door and drawer sizes are compatible with your chosen cabinet configuration and hardware.

Construct the doors and drawers using proven woodworking techniques, such as dado joints for drawer sides, and use consistent joinery methods for a professional finish. Install the doors and drawers in your assembled cabinet boxes, using appropriate hinges and drawer slides.

Sand and finish your bathroom cabinet

Use sandpaper or a sanding machine to smooth and prep the cabinet surfaces for finishing. Start with coarse-grit sandpaper, like 80-grit, then graduate to finer grits, such as 120- and 220-grit, for a smooth finish.

Apply a primer to create a consistent surface for painting or staining. Allow the primer to dry according to the manufacturer's instructions. If you plan to paint your cabinet, apply a paint-and-primer-in-one product to save time. Once the primer or paint is dry, lightly sand the surface and apply a topcoat sealer to protect the finish and enhance durability.

Congratulations! You've successfully built a custom bathroom cabinet that enhances your space, optimizes storage, and fits your unique needs. Maintain the beauty and functionality of your new cabinet by regularly cleaning and occasionally reapplying a topcoat sealer as needed. Consider periodically rearranging your stored items to maximize space and keep your cabinet organized. Embrace the satisfaction of a job well done and enjoy the improved experience of using your newly built bathroom cabinet!