Sometimes the best way to get your perfect master bathroom is to build an addition that gives you the space need. For St. Louis homes, the new bathroom addition is typically added to the rear or side of the home where the master bedroom currently is. This adds a whole new realm of exterior and interior design possibilities.

Our certified bathroom designers work in tandem with the Mosby construction team to find the perfect balance of design and carpentry that creates a bathroom addition that compliments the exterior of your home while reconfiguring the interior to give you the ultimate master suite.


You will discuss your bathroom addition ideas with a Mosby home consultant and designer to create a plan for where to place the addition, how it will function and design the look. Details to be considered are how the room addition will affect your yard, the interior layout of your home and programming ways for it to flow gracefully, as if it’s always been a part of your home.


Will your bathroom addition include a walk-in closet? His and Hers vanities? How will you access it from the master bedroom? And will we update the bedroom itself? These are the details Mosby designers take care for you. Then we move onto the look and feel of the addition, inside and out. Your designer will help you select exterior materials like siding, roofing and windows, and interior selections like vanities, flooring, faucets and lighting. All your bathroom addition features will turn into floor plans, drawings and 3D virtual tours so you get a precise idea of how your new room will function and look.


A bathroom addition includes brand new construction. Mosby carpenters build your room above local building codes, and build it to last a lifetime. We pull all permits, protect your surrounding yard, and install all exterior materials so it’s water-tight and beautiful. The same care is taken on the interior of your new bathroom, using Mosby’s plumber, tile installers, painters and craftsmen.


Every Mosby project includes a 10-year workmanship warranty. It’s another way to be assured your investment is protected and that you’ve made the right choice for your bathroom addition project.

Request an appointment with a Mosby Home Consultant.