We create thoughtful,

livable spaces.


Courtney Sempliner Designs is a full service interior design firm based in Port Washington, New York.  Through a holistic approach to design, Courtney focuses on the details and functionality of environments by creating personalized, tailored spaces specifically for her clients based on their daily lifestyle, individual aesthetic and personal narrative.  

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CSD doesn't have a 'one size fits all' style or aesthetic; we understand that each project is as unique as the client.  With extensive industry experience, we are able to work with a range of budgets helping our clients maximize the potential of their homes.


Our current and recently completed projects span the globe, including a pied-à-terre on the Upper East Side, a family home in Port Washington, Long Island, a boutique hospitality project in London, a Long Island beach house and a recently completed family home in Sun Valley, Idaho.  We're always excited to explore new locales and meet new people.


CSD takes on projects of any size, with a focus on entire home or single room designs, including new construction, renovations, furnishing & interior styling projects.   

We can help focus on all of the little details that tie into the overall big picture to create a cohesive style throughout your home.