the firm



Brandon Janshen

principal | owner

Brandon joined SDI Architects + Design as a part-time intern in May of 2009. After receiving his Master of Architecture degree from North Dakota State University in May 2011, he then moved back to his hometown of Miles City to begin a full-time career with the firm.

Brandon focuses on taking conceptual design ideas and converting them into realities through careful planning, meticulous organization, and transparent communication. He serves as the liaison between the client and the design team throughout the course of the design development phases. Throughout the entire construction process, he works directly with the client and the contractor to ensure the expectations of all involved have been fully met. In his administration role within our office, Brandon handles all Contracts and coordinates Pay Applications, RFIs/RFPs, Shop Drawings, Site Meetings, Field Visits, and Close-out paperwork for each of our projects.

Brandon became a licensed architect in August 2014 and began the transition of ownership of the business in January 2016. He looks forward to continuing the long-standing tradition of SDI Architects + Design providing reliable and knowledgeable architectural services in the Eastern Montana region for many years to come.

Mark Toennis

construction | design manager

Mark began his career at SDI Architects + Design in 1998 after moving back to Miles City from Everett, Washington, where he put his mechanical engineering degree to use as an interiors design engineer for Boeing Commercial Airplanes.

Mark provides a solid engineering background and in-depth knowledge of design and construction, particularly of roofing and steel products. His interests lie within the technicalities of building and construction details, and he has been an integral asset to our team due to his working knowledge and fine-tuned attention to detail in these detailed areas.

Mark is responsible for acting as an on-site construction manager and surveyor, as well as preparing and producing general contract documents and drawings, to include shop drawings, during the construction phases of a project. Mark also serves as the firm’s computer and internet technologies manager – an integral role in the ever-changing landscape of technology in the design industry.

 Chad Sutter

project designer

Chad joined SDI Architects + Design in 1994 and has held the role of project designer on several projects, working directly with clients on programming the overall building design, interior space planning and finish selections, site development, and landscape design.

Chad has a keen eye and creative mind when it comes to design and concept development, which is displayed in each of his finished products. His prior experience as City-County Planner for Miles City and Custer County, his involvement on Preservation Boards and Art/Design Boards in Miles City and Bozeman, and his professional involvement with numerous public advisory groups has cultured a unique perspective which he brings to each of his projects.

Chad has completed a vast array of projects and holds a broad spectrum of architectural experience to his name, including several impeccably detailed historical renovations, various healthcare facilities, and multi-family housing projects. Over the past 20+ years with the firm, he has proven himself to be a valuable resource for complex design and construction solutions.

Jenna Janshen

interior designer

Jenna began her interior design career in 2010 in the tile and stone industry before moving back to her hometown of Miles City to begin work with
SDI Architects + Design.

Her schooling in the interior design sector of the industry has helped her create a focus on end-user safety, functionality, and satisfaction; she uses these principles as the driving force in every aspect of a design solution, from interior space planning all the way through to final finish selections.

Jenna is responsible for preparing and producing elements of the contract drawings, namely interior elevations; furniture, fixtures, and equipment details; and interior finish selections and layouts. She employs custom detailing whenever possible for her clients, ensuring that each project has its own unique signature and identity.

Jenna holds a dual-role at SDI Architects + Design, also serving as the administrative assistant of the firm.