Courtney Sempliner Designs

Courtney Sempliner Designs is a full-service interior design studio based in Port Washington, New York, serving clients across Long Island, the Hamptons, New York City, London, and beyond. With over 15 years of global experience—spanning luxury projects such as a Plaza Hotel penthouse in NYC and residences in London’s prestigious One Hyde Park—Courtney blends sophistication with personal storytelling to create timeless yet distinctive spaces. Rooted in classic design principles but always offering a fresh perspective, the studio provides comprehensive design solutions that balance beauty, functionality, and each client’s unique lifestyle. From full-home renovations to single-room transformations, every project is tailored to harmonize seamlessly with the way clients live. Interior designer Port Washington NY, Long Island interior design, Hamptons interior designer, NYC luxury interior design, London interior design services, Full-service interior design studio, High-end residential in