Darrohn Engineering is headquartered in Greenville, South Carolina. Our team of experienced professionals is ready to assist you with your facility’s infrastructure needs. We are experts at navigating the complexities of regulatory requirements in order to develop innovative design solutions that meet or exceed project goals.

Our team of licensed civil engineers is at the ready to turn your concepts into effective engineered solutions. We have the civil engineering experience and creative passion that can help make your project successful.

John Darrohn

Founder & Principal


Since graduating from Christian Brothers College in Memphis, TN with a Bachelors Degree in Civil Engineering in 1991 John has served his profession and community in many ways. John has special interest in sustainable storm water design and bicycle trail and greenway projects and supports bicycle advocacy through direct participation and continued dialogue with local planners, stakeholders, and citizens. He supports responsible development and believes that both preservation of environmental resources and economic benefit are possible through common-sense design and construction.

In his spare time John enjoys listening to live music, collecting and playing vinyl records, and riding his mountain bike. John and his wife Sarah also enjoy spending time with their two young children, Emma and Ian.

Debbie Tumler

Senior Civil Engineer


With 34 years of civil engineering, Debbie Tumler is still in her element crunching grading and drainage design projects. She graduated with a bachelor’s degree in Agricultural Engineering from California Polytechnic State University, San Luis Obispo in 1985. During her 25 years with a local firm, she gained residential, institutional, energy and commercial project experience on some of the largest projects in San Luis Obispo County. Debbie joined Darrohn Engineering in the Fall of 2019 and finds that her position has given her the opportunity to work on a variety of commercial, residential, solar and agricultural projects that are both exciting and challenging.

Debbie enjoys riding her road bike, hiking, camping, knitting and spending more time spoiling her two grandchildren. Relocating to Greenville to connect with her growing family and joining a team that enjoys all aspects of engineering design has been so fulfilling for her.

Austin Fowler

Civil Engineer


After graduating Clemson University in 2010 with a bachelor’s degree in Civil Engineering, Austin worked as a mechanical project engineer for 6 years before making his way back to his true passion of civil engineering. Austin worked for another local civil engineering firm for several years before finding his home with Darrohn Engineering in 2020. As a registered professional engineer, Austin has had experience working on various commercial, industrial, and residential projects throughout the upstate of South Carolina along with several projects outside of the area.  Austin enjoys the challenges that site engineering brings and the variety of projects that he encounters as he continues his career path.

In his free time Austin enjoys spending time with his two children, Luna and Wilder, along with his wife, Ellen. Austin is also an avid marathon runner and has ran 9 total marathons including the Boston, New York, and Chicago Marathons.

David Rackley

Civil Engineer


David Rackley graduated from Clemson University with his Civil Engineering degree in 2020. While attending college, David worked as a project designer for an upstate civil engineering consulting firm designing various commercial and residential projects in the Upstate. He is a highly motivated, truly dedicated individual who enjoys the challenges of land development and civil engineering.

In his free time, David enjoys spending time with his wife Sarah, and his two dogs: Carrots & Gambit. When not spending time with his family, David can be found blacksmithing, reading, writing, or studying Russian.

Christian Lytle

Civil Engineer


Christian Lytle graduated from Clemson University in December 2020 with a Bachelor’s Degree in Civil Engineering and a Spanish minor. While in college he gained useful industry experience and knowledge working at local engineering firm. Christian has special interests in sustainable site design and business growth.

Christian is an Upstate SC native and enjoys being close enough to cheer on the Tigers. In his free time, he enjoys exploring the outdoors, cooking new recipes, and spending time with friends and family.

Sarah Darrohn

Office Manager

Sarah Darrohn officially joined Darrohn Engineering in February 2019 but has played a “behind-the-scenes” role since its inception. She has worked in the veterinary industry for 16 years and brings her experience in management, marketing, and streamlining work processes.

Sarah is a Greenville native and enjoys seeing how it continues to evolve. In her spare time, she enjoys going to see live music, cooking, making pottery, and spending time with John and their two kiddos, Emma and Ian.

Our Process

Creating a design and gaining approval for construction requires numerous steps before any equipment arrives to start digging. We follow similar steps to reach milestones for all projects.

At the outset of all projects we listen to the client for their vision and goals for the work. Sites are evaluated and preliminary project budgets and schedules are determined. We often recommend the client retain us to perform site due diligence early on to assess and verify if any “red flag” concerns will be encountered with the proposed development. We prefer to reveal any larger concerns as early as possible to limit surprises further in the process. Site surveys are obtained so we have accurate data available from which we can commence with the proposed design.

  • Project goals disclosed
  • Project budget established
  • Site selection & evaluation
  • Due diligence & surveying

It is important to know the goals before we dive in and start creating potential design solutions. Through coordination with design team members and contractors we address red flags, gain consensus, and ensure our desired solutions are constructible for the available budget. By reviewing preliminary designs with local officials we confirm permitting requirements and develop schedules for forthcoming permitting reviews and approvals should the owner decide to advance the project further.

  • Develop concept alternatives
  • Preliminary pricing
  • Assess permitting requirements

This stage is where all remaining design elements are developed and details for constructing each solution are determined and finalized. Once complete we submit the design drawings and specifications to all approving authorities to gain permit approvals allowing construction to then proceed. Coordination with the design team and contractors will ensure our solutions are valid and complete.

  • Develop construction drawings & documents
  • Obtain regulatory permit approvals
  • Finalize construction cost estimates
  • Contractor coordination

Once construction is underway our efforts are often reduced as the contractor assumes the lead role in constructing the project as designed. Where appropriate, we recommend our clients retain us for construction observation to ensure approved designs and specifications are followed to ensure compliance with the desired vision established at the project outset. Once all systems are in place we will certify various civil site work components allowing project closeout to occur.

  • Construction & implementation
  • Perform construction observation
  • Certify work
  • Project vision realized

Our Happy Clients









What's Your Challenge?

Looking for a civil engineer? We're up for a challenge! Let us know how we can help with your specific project or site concern. Darrohn Engineering is headquartered in beautiful downtown Greenville, South Carolina. Fill out the form below and we'll be in touch.

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