New Construction + Renovation
Early collaboration with architects, builders, and trade partners to shape a cohesive residence from the inside out.
Interior detailing · Full-service residential design
Homes of character.
Designed for the life within.
Explore selected work
Central Florida · Projects nationwide
The SMDG point of view
Design that feels collected, considered, and unmistakably yours.
Sims Mackenzie Design Group creates deeply personal residences through a rare combination of creative vision, construction fluency, and meticulous project stewardship.
From ground-up estates and complex renovations to complete furnishings, every detail is shaped around the people who will live there.
Discover the firm
Our aesthetic is our people
There is no formula for a home that feels personal.
We begin by listening—to the way you live, what you collect, where you gather, and what you want your home to make possible. The result is not a signature look. It is a residence with your signature on it.
Full-service design
From the first line drawn to the final object placed.
Interior Design + Detailing
Space planning, custom millwork, kitchens, baths, lighting, finish selections, and the details that give a home its identity.
Furnishings + Styling
Custom furniture, textiles, rugs, art, accessories, and window treatments composed into rooms that feel layered and complete.
Procurement + Installation
Purchasing, tracking, receiving, warehousing, white-glove installation, and final styling—managed through the last detail.
The experience
Vision, precision, and complete stewardship.
Luxury is not only what you see. It is how thoughtfully the decisions are made, how clearly the process is led, and how confidently every detail comes together.
- 01DiscoverYour priorities, lifestyle, architecture, and aspirations.
- 02DefineA clear creative direction, scope, and path forward.
- 03DesignEvery layer developed with rigor, beauty, and intention.
- 04DeliverProcurement, coordination, installation, and final reveal.
The firm
Two distinct perspectives. One deeply considered point of view.
Founded by Toni Sims and Kelsey Mackenzie, SMDG brings together deep design and construction expertise with a fresh, strategic approach to creating exceptional homes.
Alongside a talented team, Toni and Kelsey guide projects nationally and internationally with creativity, clarity, and a commitment to relationships that extend well beyond a single residence.
Toni SimsFounder + Director of Business Development
Kelsey MackenzieSenior Partner + Director of Design
16+Years collaborating
NationwideLuxury residential work
Concept to completionComplete design stewardship
Designing from Central Florida
Custom residencesWhole-home renovationsSelect projects nationwide
A client perspective
“Thank you for my incredibly beautiful, polished, sophisticated and finished home.”Liz + Jason G. · Virginia
Behind the scenes, current projects, and everyday inspiration
Follow SMDG on Instagram
Your residence, thoughtfully imagined
Begin a conversation.
Tell us about your property, your vision, and where you are in the process.
Inquire with SMDG