Our Story

Welcome To TWC

TerWisscha Construction, Inc. (TWC, Inc.) has been providing professional services from architectural design to construction services since 1963. The
ingenuity and integrity that TWC team members possess has given them the reputation of being the leading source for the markets they serve; Veterinarians, Dental Professionals, and Funeral Directors.
TWC has over 40 employees and three office locations, with the main headquarters located in Willmar, MN. The other two locations
include Sunbury, PA and Denver, CO.

Our History

TWC was started in 1964 by John TerWisscha in Willmar, MN. The company started as a local, residential construction firm and transitioned into the commercial market in 1970.

Upon retiring in 1996, John TerWisscha sold the company to his son, Kelly TerWisscha, and son-in-law, Keith Nelson.

Once in the commercial market, TWC decided to focus on niche markets in order to become experts in these niche markets. Today, TWC works within the Veterinary, Death Care, General Dentistry, and Oral Surgery markets.

TWC Founder, John TerWisscha (JT), in the original TWC office.

TWC Founder, John TerWisscha (JT), in the original TWC office.


Our Process

TWC’s unique approach to the Design/Build process starts by teaming up with you in the very beginning phases of your project. From assistance in selecting the perfect site for your practice, performing feasibility studies, and design options, we work with you to see that your project is accomplished in a way that will be best for your business and budget.

As a partner with you, we are committed to studying the changes in your industry so that you are assured of having a facility that will help you meet your client’s needs today and into the future.

Construction Contractors Advisory Board

Contractors Advisory Board: CAB Group

The Contractors Advisory Board is a peer-to-peer program, bringing together contractors for win-win sharing. This group is made up of similar non-competing contractors that meet to discuss matters of business and personal interest. The trust and open exchange of information allows members to learn from others and share ideas. TWC has been associated with the CAB group for many years. The CAB group consists of 4 contractors. The group meets two times a year and each company takes a turn hosting the meeting. The CAB group by far exceeded all of TWC's expectations. Through the CAB group, TWC has been exposed to innovative ideas, technologies, and processes that others in the construction industry are using. The group also serves as a great sounding board for ideas, thoughts, and concerns that result in non-threatening and constructive feedback. Best of all, the CAB group has created a wonderful group of friendships.

Listen, Learn then Lead with Integrity

  • Cliff and Carol Gravem, Midtown Animal Clinic

    Building a brand new veterinary hospital is a daunting job at best. With TWC and their incredible staff behind us, we had a fantastic experience and an incredibly smooth transition. Our new hospital is functional and gorgeous. Many of our clients call it "the best looking building in town." We highly recommend TWC!

    Cliff Gravem D.V.M./Owner

    Carol Gravem Hospital Manager/Owner
  • Dr. Mike, Maple Veterinary Clinic

    TWC has been awesome to work with. I chose them to do a remodel/expansion on my veterinary hospital. They met their deadlines. Their communication has exceeded expectations. They go above and beyond while meeting financial concerns. I personally dealt with Eric from the beginning when setting up my project and I couldn't say enough about his attention to detail, communication and thoroughness. I then started dealing with Brendan, the project manager. He was superb. He kept my project within my budget and was just an absolute pleasure to deal with. Up next was my superintendent Kevin. Talk about just an overall fantastic person. This is a man that takes great pride in his work and rightfully so. I couldn't have asked for a better team. I would highly recommend them to anyone. They are honest, fair, and always put your best interest first. 5 stars without a doubt! Dr. Mike Derkervorkian, Maple Veterinary Clinic via Facebook January 26, 2015
  • Dr. Regehr, Perimeter Veterinary Center

    Perimeter Veterinary Center was designed by a team of animal healthcare professionals. Careful attention was paid to every detail from minimizing clients' wait time to optimizing the efficiency of staff and the effectiveness of working areas, so we may provide (our clients) with the best pet health care possible. Dr. Regehr Permineter Veterinary Center

Have a veterinary construction idea? We can help you...

We provide Veterinary Design Build services nationwide. We have worked in almost every state in the U.S. and welcome the opportunity to discuss your remodel, expansion, tenant improvement, or new building construction project. Connect with us to get started!