Listen deeply
Understanding the client comes before defining the aesthetic.
Sims Mackenzie Design Group
Personal by nature. Exacting by practice.
A boutique residential design firm creating homes of depth, beauty, and belonging.
Our point of view
We believe the most memorable homes reveal the people within them.
We listen to how our clients live, what they value, and what they want their home to make possible—creating enduring interiors shaped by architecture and individual story.
The founders
A partnership built on complementary strengths.
After more than 16 years collaborating, Founder Toni Sims and Senior Partner Kelsey Mackenzie balance creative intuition, construction knowledge, technical rigor, and clear communication.
Toni Sims
Founder + Director of Business Development
Kelsey Mackenzie
Senior Partner + Director of Design
What guides us
Design holistically
Every decision is considered as part of the home’s complete composition.
Lead with care
A beautiful result should be matched by a thoughtful, well-guided experience.
Where we work
Based in Winter Garden. Designing beyond Florida.
SMDG serves clients throughout Central Florida and accepts select residential projects nationwide.
Introduce your project