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45 Architecture combines the intimacy and one-on-one mentoring environment of a small practice

with the extensive knowledge of

a major design firm.


"As active and passionate members of our community, we believe we owe it to our neighbors to collaborate with them to design spaces where they want to live

their lives. "

— 45A Owners




45 Architecture was originally co-founded in 2014 in Bozeman by Benjamin Erickson and then later joined by Architect, Jeff Lusin. Ben and Jeff have been fortunate to add many talented 45 team members throughout the years. Allowing the firm to grow and complete diverse project types at the national level. Making them one of the top design firms in the country. Recently, 45 Architecture was ranked number 103 for top design firms in the country by Building Design + Construction Network.

45 Architecture is a diverse planning, architecture and interior design firm that offers comprehensive services to clients in both the public and private sector. Our design process brings together our experience as professionals with functional goals, project scope, challenges, and opportunities which combines the intimacy of a small design practice with the extensive national knowledge of a major design firm. Our approach is defined by the energy we infuse into the creative process, and the collaborative environment we encourage.  From the instruments we use to communicate, to the use of emerging technologies, our attention is focused on solutions that are creative, enduring, and achieve client goals. Our culture is founded on the vigorous exchange of entrepreneurial ideas and designed to foster this spirit. We have an informal work environment where camaraderie and collegial support are highly valued. Where ambition, high work morale, and dedication to being the innovators of our field unify our firm. We strive to serve our communities through the spaces we design and through our engaged design process. A process that adds value to those spaces which in turn strengthen our communities, businesses, institutions, organizations and individuals all together.

45 Architecture​​

Provided Services:

  • Pre-Design Feasibility and Planning

  • Architecture

  • Interior Design

  • Project Management

  • Construction Documents

  • Construction Administration

  • Graphic Design/ Branding Assistance

Design Expertise:

  • Adaptive Reuse

  • Community, Non-Profit

  • Corporate, Commercial

  • Civic

  • Entertainment

  • Higher Education

  • Single-family Residential

  • Historic Preservation

  • Hospitality

  • Independent K-12 Education

  • Institutional

  • Library

  • Master Planning

  • Manufacturing

  • Medical

  • Mixed Use

  • Multi-Family Residential

  • Public K-12 Education

  • Retail

  • Sports and Recreation

Designing + Serving our Communities

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