With a wide range of commercial, institutional and industrial project experience, Simonsen Architect has the very capable abilities to coordinate and manage your project from inception to move in.  Having completed community outreach forums, successfully achieved challenging entitlement processes and negotiated campus approvals our background can benefit your project to bring it to successful fruition. Whether you are considering: innovative workplace renovations, preservation of historic structures or relocating to grow a business or optimize efficiencies, we can help. We take pride in our ability to realize efficiencies in our structures with cost effective strategies, creatively using innovative materials and realizing dynamic spaces for occupying staff and customers.


Ultimately, our success and longevity is a direct result of our intricate understanding of construction, blending design and technical requirements together to deliver the best possible structure for our clients.

  • 1537 Avenue D Commercial Building

This project reinvented an early 1960’s era commercial building to update the aesthetic, replace mechanical and electrical systems and establish appealing and accessible entries on each side of the building. Work included landscaping and parking lot site improvements to increase parking.

  • Shiloh Crossing Retail Building-former Bike Shop

Montana AIA merit design award winning retail building in the Shiloh Crossing retail development. Building employed sustainable materials and a high-performance design, energy efficient building envelope with solar access and shading modeled specifically for the location. Insulation and glazing choices were informed by energy modeling to provide the best financial and efficiency.

  • Hilands Golf Club

A replacement clubhouse for one of the oldest golf clubs in Montana. Membership desired a traditional design that felt like a golf clubhouse. Building was sited on the golf course to offer maximum views and create a breathtaking patio overlooking the course.

  • Big Timber Carnegie Library

The community of Big Timber desired to restore and expand their treasured Carnegie Library. While with A&E Architects, Eric worked with Preservation Architect, Jim McDonald and the building committee and Librarian to help see the restoration and addition through public input and planning sessions, design, construction drawings and to occupancy. The thriving local library now serves as both the local public library and center for community meetings and events. The addition respects and compliments the original architecture of the historic building. During the process the building was placed on the National Register of Historic Places.

  • Veeder Homestead Office Building

This project reused an existing movie theatre building to creatively reimagine an existing building and employ the strategy of reuse to efficiently find a new life for an existing building.  The building uses a raised access floor to provide data and phone service as well as HVAC to the building’s occupants in a most efficient and comfortable way. The exterior implements durable and beautiful materials to create a professional looking office building in the re-envisioned new use.

  • First Security Bank-Roundup

This bank building in Roundup, Montana consisted of a major renovation, demolition of two neighboring buildings and an addition to take the local community bank into the next century. The building located on Main Street is contemporary yet reflects the historic fabric of the downtown buildings on Main Street and provides a welcoming and beautiful facility for the staff and customers.

  • UM Payne Family Native American Center

Teamed with native architect, Daniel Glenn of 7 Directions Architects, this LEED Platinum building on the University of Montana campus serves the Native student population at the University, houses classrooms for Native American studies, staff offices for the department and Native student services and the Ki Yi Yo Club for students. The project employed energy and daylight modeling to produce a very efficient and daylit building for its occupants.


Note: Projects on this site were completed as a principal or employee of A&E Architects, P.C.

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Simonsen Architect’s residential work strives to consider placement on the land to optimize views, shelter outdoor spaces and the building from the weather and take advantage of special aspects of the property.  Incorporating pleasing and efficient plan layouts with occupant comfort in mind, arrangement of spaces often contain large open spaces and more compact intimate scaled areas. The goal to bring well considered daylight to most every room in a house is always in mind during design. Thoughtful use of materials in creative ways is a constant goal to bring a unique and well scaled exterior design to projects.

  • Zimmerman Place Residence

This 2016 Parade of Homes Entry was a showstopper home that went away from the more traditional aesthetic of past parade homes. The design took maximum advantage of the site and stunning views from this homesite atop the rimrocks in Billings, MT. Designed with Newman Quality Built Homes and Clint Schultz-interior designer, the house stunned visitors with its many innovative and beautiful features.

  • Rock Creek Contemporary Cabin

The Rock Creek Cabin situated on the banks of Rock Creek, just north of Red Lodge, Montana is a small contemporary design constructed of SIP-structural insulated panels with in-floor radiant heat. The design provides a highly efficient and comfortable get-away for the Owners that met their goals for a small but beautiful place for family and friends.

  • Rock Creek Barn

This barn constructed with Corten (rusty) siding provides garage space, storage and entertaining space for the owners when they choose to entertain larger groups than their adjacent compact cabin will accommodate. The straightforward but elegant detailing and minimal number of materials catches the eye of many as they visit the site.

  • Rock Creek Cabin

The cabin along Rock Creek has been a multiple project effort to first renovate and expand and then further expand to accommodate a family and their growing ceramic art collection.  Situated along the Creek the family experiences the change of seasons and regular visits from wildlife.

  • Rock Creek Studio

A garage, guest quarters, and a second-floor fabric artist’s studio is housed in the cozy story and a half structure on an expansive site.

  • Kelley Residence

Situated immediately below the rimrocks with a view of the Yellowstone Valley and surrounding mountain ranges, this house was designed to take full advantage of the views offered by this site. The design strived to open up these views and at the same time control sun exposure with adequate roof overhangs, larger west overhangs and well-conceived placement of windows. The design implements a monochromatic siding and trim color scheme that highlights the stained glue laminated beams, columns and the stone work.

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I have had the pleasure of working with Eric Simonsen on a variety of projects ranging from residential to commercial. It’s a joy to work with someone who is so dedicated and engaged to his craft.

David Hiltner, Executive Director & Artist

Red Lodge Clay Center