Discover the Southwest Design Build Difference

Southwest Design Building is a commercial contractor specializing in healthcare construction, with over 50 years of combined experience delivering high-quality projects across the Southwest. Our approach is simple: we’re big enough to provide comprehensive construction services but small enough to offer personalized attention to every client.

Operating in Arizona, Colorado, Oklahoma, Texas, Utah, and soon expanding into New Mexico and Nevada, we bring a deep understanding of regional regulations and industry best practices. We pride ourselves on building long-lasting relationships with our clients, over half of whom return to us for repeat business year after year.

When you choose Southwest Design Building, you’re choosing a partner who is committed to your success from start to finish.

At Southwest Design Building, we take a value-driven approach, ensuring every project is delivered on time, within budget, and to the highest standards. From initial contract development to final project close-out, we work closely with clients to manage every detail, mitigate risks, and provide the expert guidance needed to make each project a success. Our team of skilled professionals is dedicated to open communication and collaboration, serving as an extension of your staff to bring your vision to life.

Seth Simmons

With over 30 years in construction, Seth has owned and operated several companies, including Southwest Design Building for over 10 years and Southwest Facility Maintenance. He has successfully managed multiple user and multiple location projects for repeat clientele, as well as challenging stand-alone projects. He brings leadership for staff and operations, as well as direction for all design-build operations, program management, project management, condition assessment services and construction processes to Southwest Design Build. He possesses a unique understanding of design, authority and city review processes many contractors don’t have because of the years previously spent with a design-build firm, as well as the necessary construction processes and administration.

Having worked with Dan Hinkson at Sigma Contracting 30 years ago, and with both maintaining a personal and professional relationship over the years, they have come full circle to be able to work with each other again.

In his spare time, Seth can be found restoring old trucks, and participates in and occasionally hosts ‘ratrod’ events region-wide.

Doug Deboef, Estimating/Project Management

Born in Goodland, KS, Doug has been in AZ since 1989. With over 20 years in construction, Doug has been active with Southwest Design Building for 3 years. His duties include estimating as well as project management, and he works to create and send bid packages as well as manage projects from start to finish.

Previously, Doug owned his own business, and was an active Superintendent, Foreman, and both rough and trim Carpenter. This varied background gives him the experience to draw on to successfully estimate and manage projects for a successful outcome.

Over the years Doug has achieved some interesting skills, including JAVA programming, and bringing his golf handicap from a 20 to an 8.

Juan Carlos Herrera was born in Caracas, Venezuela. With a degree in Civil Engineering and Project Management education, and over 30 years of construction background, Juan Carlos has a vast history of experience and expertise to draw on. His duties with Southwest Design Building as Superintendent and Project Engineer.

In his previous years Juan Carlos has helped manage the adaptation and reconstruction of more than 400 gas stations, the completion of a gas processing plant, and a gas pipeline both offshore and onshore for the gas processing plant. He is well suited to help manage complex as well as simple projects for a successful outcome.

When not working, Juan Carlos likes working out at the gym, riding his bike, traveling, kayaking and relaxing at the beach. He also enjoys listening to music, watching good movies and interesting reads.

Juan Carlos is extremely proud of his family and the children he has raised, the life he has been able to afford them, and the education and degrees he has attained. When meeting people they quickly see that he is not a person to hide anything about himself, he is a very authentic and peaceful person.

The best business advice he has been given has interestingly been about Japanese business philosophies – their companies are considered as their baby that they must feed (invest in) until maturity. This feed/investment is not only in material assets but also in the training of its HR to make it sustainable.

The best business advice he will share is that all processes can be improved. This follows the Japanese philosophy of continuous improvement.

Jennifer Kirby, Business Administrator

Jennifer Kirby was born in Lancaster, CA but has lived in Arizona most of her life. With her ABA and upcoming SHRM certification, Jennifer has overseen the office management, HR and accounting and contract management for Southwest Design Building for over eight years.

With a ‘can-do’ attitude and the ability to rapidly master and implement new methods and procedures, Jennifer has been able to help create processes to successfully coordinate and manage successful operations flow for a growing operation.

Jennifer considers her children as her best personal accomplishments, never forgetting the most important priorities in life. People might be surprised to learn that she used to race dirt track cars in her young teens.

The best business advice Jennifer’s received was from an (almost) famous man (Seth Simmons) who said to her “Just Trust Me” and so far it’s all been good!

The best business advice she would share with others is “when you fall down just pick yourself up again”.