Custom Modular Bathroom Vanity Cabinet – DIY Build Project
If you’re looking to upgrade your bathroom with a custom-built vanity cabinet, this project is a perfect blend of function, flexibility, and clean design. Instead of building one large cabinet, this vanity is constructed using a modular cabinet system, where individual cabinet sections are built separately and then joined together. This approach makes the project easier to build, easier to transport, and fully customizable to your space.
This build features a comfort-height vanity, an open back for plumbing access, smooth-operating drawers, and clean modern lines. While this design was created specifically for a bathroom with an offset sink, the same cabinet system can also be adapted for kitchen cabinets, shop storage, laundry rooms, or built-ins.
Custom Bathroom Vanity with Offset Sink Using 2 Cabinet Boxes
Why a Modular Cabinet Design?
Traditional vanity cabinets are often built as a single large structure. While that works, it can be more difficult to construct, move, and install—especially in tight spaces. With a modular design, each cabinet section is built independently and then joined together during installation.
Here are some key advantages of this modular system:
Easier handling and assembly
Fully customizable widths and configurations
Better access for plumbing and electrical
Flexible for future modifications
Adaptable to many different projects beyond bathrooms
Whether you’re working in a small shop or a garage, building in modular sections simplifies the entire process.
Project Highlights
Built using ¼”, ½”, and ¾” plywood
Comfort-height design at approximately 34.5”
Separate drawer and door cabinet sections
Open-back cabinet design for plumbing clearance
Full-extension drawer slides
Soft-close European hinges
Clean finished edges with edge banding
Designed for paint or stain finishes
This vanity was completed with a painted finish, but it can be customized to match any style—from modern to farmhouse.
Designed for Customization
One of the biggest advantages of this build is how easy it is to customize. You can:
Adjust cabinet widths
Change the toe kick height
Modify drawer layouts
Add additional cabinet sections
Adapt the design for different rooms
The plans are built around standard materials and hardware so you can scale the project to your needs without redesigning everything from scratch.
Build Plans Available
To make this project easy to follow and repeatable, I created detailed downloadable plans that include:
Complete material and cut lists
Step-by-step assembly drawings
Cabinet, drawer, and toe kick dimensions
Hardware specifications
Helpful building notes and tips
These plans are perfect whether you’re a beginner woodworker or someone with more shop experience who wants a reliable starting point.
Example page from the build plans available on Etsy
👉 Download the full build plans here:
Etsy Build Plans
Watch the Full Build Video
If you’d like to see the entire process from start to finish, including cutting, assembly, drawer installation, finishing, and final installation, you can watch the full build video on YouTube.
Here are some of the components and jigs used in the build video.
The video walks through every major stage of the project and shows how the modular system comes together into one complete vanity.
Final Thoughts
This modular bathroom vanity cabinet is a practical, strong, and highly adaptable design that works for far more than just bathrooms. If you’ve been wanting to build your own custom cabinets but felt overwhelmed by the size of the project, this system breaks it down into manageable, repeatable steps.
If you decide to build one of your own using the plans, I’d love to see how you customize it for your space.
