MJM Design Company

As the lead designer and owner,
I bring passion to every project that
I undertake. As the Director at Large for the American Society of Interior Designers Missouri East Chapter, I continually strive to bring insight to this ever-changing industry.


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Remodeling and Home Design


About Us

As the owner of MJM Design Company in St. Louis, MO, I know that giving you the interior look and client experience you want starts with great communication. If you give me a chance to listen to your ideas, I’ll give you a look that you’ll cherish forever.  


Our Services

I believe that effective interior design should be a collaborative effort. By encouraging feedback throughout the design process, I’ll ensure that you get a result that you absolutely love.

Whether you’re focusing on kitchen design, bath design, remodeling, renovating or you’re just hoping to update your look, I’m incredibly happy to help. 



Testimonials and Reviews

The Customer Knows Best

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Curious to see what it’s like to work with me? Read these customer reviews for a better idea.

"Love my transformation!"

- C.E., St. Charles, MO

"I had the privilege of working with MJM Design Company in remodeling my Kitchen and Family Rm. Joyce Mathis was so easy to work with, and she and her crew made the experience a very pleasant one. I love my new space! She was able to take my ideas and tweak them into my perfect Kitchen and Family Rm. Joyce was very patient with me when it came to making the decisions to create this amazing space! I highly recommend working with her. It will be a very enjoyable and satisfying experience." 

- Jean S., St. Charles County, MO 

“Thank you again for your effort to make sure I was able to complete the kitchen before the wedding weekend! It looks great and [we] both love how it turned out. The workmanship couldn't have been better! Excellent job in completing the task first class!"  

B.K., Weldon Spring, MO 

"Our new lower level is both beautiful and functional thanks to MJM Design Company. It was great working with Joyce Mathis. She somehow figured
out what design style we would like and created three new rooms that we now love. Her help in selecting furnishings, colors, finishes, and the subtle extras that made the area into a unified design was great.
Not content to help us select something we thought was OK, she always persevered until she found something we thought was perfect. The end result is a lot of function
in relatively small space that feels spacious and looks beautiful. It's now our
favorite space."  

Lawson & Sandy H., Lake St. Louis, MO 

"We worked with Joyce from the ground up when building our new home. She was readily available and consistently able to meet mine and my builder's time schedules. I was comfortable researching with her and collaborating ideas together. We were happy with the resources she brought to the table, both in quality and creativity. It was a pleasure to work with Joyce and we wouldn't hesitate to work with her again in the future."  

L.G., St Charles County, MO 

"I consulted with Joyce Mathis, MJM Design Company, in early 2011 for recommendations and assistance for my kitchen. I had a problem with an island (with cooktop) that was too close to the refrigerator, and it needed a pop of color. She replaced the countertops and island top with Cambria, added a colorful stone and glass backsplash, moved the island, and removed a couple of unnecessary doors. My kitchen looks fantastic! Joyce stayed within my budget, and since I like to repurpose, she was respectful of that. The work was completed in time for a bridal shower I was hosting. I plan to use MJM Design Company again when ready to do the basement."  

S.B., Ellisville, MO

Contact MJM Design Company

Please send me a message. I look forward to making your experience as satisfying as it was for these clients.