Long Island, New YorkInterior Designer on Long Island
From North Shore family homes to Hamptons Designer Showhouse spaces, Courtney Sempliner Designs brings full service interior design to Long Island.
Long Island homes, designed with care
Based in Port Washington on Long Island’s North Shore, our work on the Island includes the renovation and addition to a center hall colonial home (Project Webster) and the gut renovation of a nineteenth century family home on the North Shore (Project South).
Courtney has also been invited to design for the Hamptons Designer Showhouse across several years, including an entrance foyer in collaboration with Calico Wallpaper in 2025, powder room and guest bath spaces in 2022, an ‘Americana’ outdoor living space in 2021 and a laundry room in 2019. Her work has been featured in HC&G, NYC&G and Newsday.
Whatever the scale, we manage the process with trusted suppliers, artisans, contractors and sub-contractors, for a streamlined experience.
PortfolioLong Island projects
Renovations, additions and a Hamptons showhouse foyer.
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Project Webster
Renovation and addition to a center hall colonial home on Long Island.
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Project South
Gut renovation to a nineteenth century family home in on the north shore of Long Island.
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Project North Shore
Design of a private family home in Port Washington, New York.
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Hamptons Designer Showhouse 2025
Our entrance foyer space in collaboration with Calico Wallpaper to launch their new design, Abalone.
ServicesA tailored, à la carte design process
01
Planning
- Client Consultation
- Preliminary Budget
- Scope of Works
- Space Planning
- Review of Existing Plans
- Review of Pinterest Boards or Reference Images
02
Design
- Mood Boards
- Furniture Layouts & Elevations
- Finish, Fixtures & Material Research
- Kitchen & Bath Design
- Architectural Finishes
- Lighting Design
03
Project Management
- Budget Planning
- Coordination with Builders/Contractors
- Assist with Bidding Process
- Procurement & Purchasing
- Organization of Deliveries
- Turnkey Project Handover
“Courtney helped us from the beginning of an extensive gut renovation to the end, and was with us every step of the way.”
— Alana, PORT Washington Family HOMEQuestionsFrequently asked questions
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No. Our work has also included a family home in Sun Valley, Idaho, and a boutique hotel in London, but Long Island is home base
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Yes. We have designed spaces for the Hamptons Designer Showhouse in 2019, 2021, 2022 and 2025.
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Yes. Our project management services include coordination with builders and contractors and assistance with the bidding process.
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Yes. We offer a menu of à la carte design services and are happy to create a tailored package that includes whichever services your project requires, depending on its scale and budget.
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Complete the contact form with your project location, the services you’re interested in and the scope of work. We’ll get back to you within 48 business hours.
Planning a Long Island home project?
If you have an upcoming project, we would love to hear about it. We’ll get back to you within 48 business hours.
79 Main Street · Suite 307 · Port Washington · New York · 11050 · 516.246.6077