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Onyx Design Collaborative is a full-service residential interior design firm based in Charleston, SC and serving clients across the country.


Founded and directed by Emily Cox and Michelle Suddeth, Onyx Design Collaborative sets the new standard with a signature client experience, a combined 25 years of industry expertise, an affinity for contemporary elegance, and a highly structured execution.   


Coupling sophistication with sense, our expertise includes architectural detailing, interior elevation development, construction administration, and more for premier properties. We pride ourselves on truly knowing the project, the process, and the people involved before coaxing the best from each element.


From concept to completion, Onyx Design Collaborative delivers excellence for the distinguished dweller in relentless pursuit of revelatory experience, refined luxury, and curated elegance.


Onyx Design Collaborative is committed to elevating the standard for interior architecture and interior design across the greater Charleston area and beyond.


By actively participating in the design process from the earliest conceptual stages, we ensure that the potential of our clients’ projects is maximized, while the communication lapses and resultant conflicts that unnecessarily complicate other working methods are avoided.


The high level of active engagement that our designers bring to each phase of the project, from initial concept to final installation, results in a perfectly personalized unique embodiment of each client.


Armed with a logical approach to the creative process and decades of industry expertise, Onyx Design Collaborative provides an exemplary experience through clear communication, organized approach, unparalleled discipline, steadfast ethics, and, most importantly, an unmatched motivation to achieve results that will exceed our clientele’s highest expectations.


When it comes to curating your home, we believe the experience should be as finely composed and exquisitely executed as the design itself.



Bath Accessories & Mirrors

Cabinetry Design Direction & Finishes

Decorative & Architectural Hardware

Decorative Lighting & Ceiling Fans

Flooring Material & Finishes

Paint & Stain Finishes


Stone Slabs & Tile



Area & Accent Rugs

Artwork & Mirrors

Bed Linens

Custom Window Treatments

Decorative Pillows & Cushions

Table & Floor Lamps

Upholstery, Casegoods, and Accent Furniture



Budget Development

Delivery Tracking

Finish Sample Review

Installation Direction and Supervision

Production Detail Monitoring

Purchase Order Development

Trade Discount Coordination

Vendor Account Coordination

Warehouse Inspection Coordination


Our comprehensive approach integrates all aspects of your home to deliver a beautifully realized version of your vision. Exceptional education and expertise allow us to execute all the necessary documents, drawings, and processes required to maximize the potential of your project through our proven methodology. This structured, seamless approach dovetails with the construction process, ensuring that no detail is overlooked.

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