Who we are
The Picket Fence Interior Design Studio is a full-service interior design firm dedicated to creating inviting and inspiring spaces that reflect your lifestyle and personality. Known for our fresh, bright interiors and warm, refined aesthetic, we blend timeless design with organic materials, layered textures, and effortless comfort to create spaces that are both functional and beautiful.
Based in Ketchum, Idaho, our team has designed homes across the East and West coasts, and many of our clients rely on remote design to bring their vision to life. We have developed a seamless, transparent process to guide clients through every step, from concept to completion. Our designers provide everything needed to visualize the project, including design boards, renderings, detailed drawings, and budget breakdowns.
Managing the complexities of new construction and renovations requires precision and organization. That’s why we’ve developed an organized approach to track every detail—from product selections and order statuses to invoices and approvals—ensuring clarity and peace of mind throughout the process. Transparency is at the core of our approach, so you always have full insight into costs, selections, and project progress. We look forward to bringing your vision to life with thoughtful design and effortless, timeless comfort.
We offer a comprehensive range of services to bring your vision to life with thoughtful design and expert craftsmanship. Our services include:
Space Planning – Optimizing layouts for functionality and flow.
Drafting & Rendering in AutoCAD/Revit – Professional visualizations for precise design execution.
Finish & Fixture Selections – Curating high-quality materials and fixtures for a cohesive look.
Flooring & Tile Selection – Selecting durable and stylish surfaces to enhance your space.
Furniture Selection – Sourcing timeless and comfortable pieces tailored to your needs.
Finish Work & Custom Cabinetry – Crafting bespoke details for a refined aesthetic.
Custom Window Treatments – Designing elegant and functional window coverings.
Custom Bedding – Creating luxurious, tailor-made bedding solutions.
Art & Accessory Selection – Adding the perfect finishing touches for personality and charm.
Exterior Finish Selection – Coordinating exterior materials for seamless indoor-outdoor harmony.
LEED & Eco-Friendly Design – Implementing sustainable solutions for a greener future.
Staging – Preparing spaces with expert styling to maximize appeal and value.
Whether you're redesigning a single room or transforming an entire home, our expertise ensures a seamless and beautiful result.
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Erin Kosach
STUDIO DIRECTOR | LEAD DESIGNER
Erin’s expertise in interior design is enriched by her background in woodworking and architecture, allowing her to bring a meticulous, hands-on approach to every project. Known for transforming high-end residential and commercial spaces into beautiful, functional environments, she ensures each design reflects her clients' unique vision with a personalized touch.
With a background in architecture from California College of the Arts, Erin blends creative vision with technical expertise, guiding projects from initial concept to final installation with precision and care. Clients trust her to provide a seamless and enjoyable design experience that exceeds expectations.
When she's not working, Erin enjoys traveling the world, exploring new cultures, and spending time outdoors with her family and two heelers. Whether it’s snowboarding, skiing, nordic skiing, mountain biking, trail running, or water sports, she thrives on adventure. Married with two daughters, Erin and her family embrace an active, nature-filled lifestyle. Originally from the Reno/Tahoe area, she relocated to the Wood River Valley where the stunning landscapes continue to inspire both her personal and professional life.
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Sophia Symms
JUNIOR DESIGNER
Sophia supports the team with CAD drawings, material sourcing, and design presentations. Originally from San Diego, she earned a BFA in Interior Architecture with a minor in Art History from CSU Chico.
Seeking a deeper connection to nature and a more intentional way of living, she moved to the Wood River Valley, drawn to its strong sense of community and creative spirit.
Inspired by the valley’s landscapes and focus on wellness, Sophia enjoys exploring the outdoors, engaging in seasonal activities, and making fresh juices. She is excited to be part of a design studio that values innovation and individuality, helping bring unique and thoughtful spaces to life for each client. -
Anne Thurman
PURCHASER
Anne joined TPF Interior Design after relocating to Sun Valley full-time a year ago. With a background in advertising and a dedicated period spent raising her two daughters, she later re-entered the workforce in PR and marketing. Most recently, she played a key role in managing the office of a Los Angeles-based interior designer, serving as the primary liaison between the lead designer, clients, and vendors. In this role, she oversaw ordering, product selection, specifications, scheduling, and project coordination, ensuring seamless execution from concept to completion.
Passionate about creative environments, Anne now brings her expertise to TPF Interior Design in a similar capacity, contributing to the team's dynamic and client-focused approach.
Outside of work, she enjoys visiting her children and grandchildren, cooking, exploring new hobbies, and embracing all that Sun Valley has to offer—including skiing on Baldy.