45 Architecture & Interiors

45 Architecture & Interiors is a Bozeman-based architecture and interior design studio dedicated to bringing the Montana lifestyle to life through thoughtful, guided design. Serving communities across Southwest Montana—including Big Sky, Belgrade, and beyond—the firm specializes in luxury custom residential, civic, hospitality, and mixed-use projects that are deeply rooted in place.

Founded on the belief that architecture should elevate everyday living, 45 approaches each project as both creative partner and trusted advisor. The firm’s process blends visionary thinking with disciplined execution—translating complex ideas into clear, buildable solutions. Whether designing a mountain retreat framed by the Bridger range or a community library intended to serve generations, the work is grounded in context, craftsmanship, and long-term value.

Led by Principals Jeff Lusin, Ben Erickson, and a collaborative team of architects and designers, 45 Architecture & Interiors emphasizes holistic design—where site, structure, materials, interiors, and experience are considered as one cohesive narrative. Their work reflects clean, modern forms layered with warmth, texture, and a deep respect for the natural landscape.

Beyond aesthetics, the firm is equally committed to process. Through clear communication, integrated project management, and strong partnerships with builders and consultants, 45 guides clients from concept through construction with transparency and care.

At its core, 45 Architecture & Interiors exists to build what matters—creating spaces that reflect the ambitions of their clients, strengthen communities, and stand the test of time in the rugged beauty of the American West.