Locally Owned. Committed to Community.

Owner Erik Dieringer started his roofing career after graduating from Waukesha South High School in 1992. What started as Dieringer Roofing exclusively offering roofing services, eventually adapted to Big Fish Contracting LLC in 2001. Years in the industry and experience in other forms of home remodeling and renovation called for a new business that encompassed the diverse services the Big Fish team was able to offer customers. Now, with over 20 years of experience, particularly in roofing and siding, Big Fish Contracting has proudly built a reputation as an industry leader in exterior renovations in Waukesha and Milwaukee Counties.

Family Owned and Operated

When you hire a contractor, you are putting a great deal of trust in that team – believing they will do the best for you and your home, that they will treat you with respect, and that they will provide honest and quality services. An important part of trusting your contractor is knowing more about them. We believe that our dedication to our family and our involvement in the community are a great place to start. We have all built a life in Lake Country – our homes are here, our children are being raised here, and we work with families all over the area. Go ahead and take some time to get to know us and please contact us if you have any questions or are interested in getting started with a project for your home!


The Dieringer Family

Erik and Lindsay Dieringer have been married for 22 years and have four children: Amber, Alex, Hannah, and Lola (short for Olivia!). Lindsay has been working in the Big Fish Contracting home office for years. In fact, you’ve likely heard her friendly voice if you’ve ever called the office! Amber is a college senior at Trinity International University in Deerfield, IL. She has a passion for writing and journalism (sports in particular), and lends her talents to our social media team and contributes to our industry and news articles.  Alex is a freshman at Carroll College and also has a passion for writing and screenplays. Always willing to lend a hand, you can often find Alex helping out our team (and dad!) with many diverse tasks. Hannah is in 10th grade and is busy playing volleyball while Lola is in 7th grade at North Shore Middle school, you may see her in a drama or singing at Hartland music.


Our Team

With over 20 years in the roofing, siding, and home remodeling business, Erik and Big Fish Contracting have earned a strong reputation as an industry leader in Southeastern Wisconsin. In fact, much of Big Fish business is based in word of mouth and person-to-person references. That’s why Erik has put together a team of dedicated professionals who believe in honest, hard work and providing quality results, every time.

At Big Fish Contracting, we’re looking for a full-time, experienced carpenter and carpenter’s apprentice to join our team! Contact us today!

Al Johnson
Project Manager

Al has been a close, personal friend of Big Fish owner, Erik for almost 20 years. It took him years of asking, but Erik was finally able to lure Al from his successful small remodeling business and officially join the Big Fish team. Al is our dedicated project manager and estimator all of our remodeling projects. His attention to detail, care for people, and incredible organizational skills make him a perfect fit for our clients and our team. In fact, many of our clients stay friends with Al even after our project is finished. Chances are, when you see Al, you’ll also see his dog Zoey riding shotgun. (We think she’s the real reason folks love Al!) When he’s not working, Al spends his time hiking and hunting. If he’s not working on home projects, you can find him spending time in the woods, enjoying nature.

Tanya Weltzin
Office Administrator

Tanya is the friendly voice you hear on the phone and our behind the scenes coordinator! Her favorite part of the job is hearing from our wonderful clients; whether it’s the very first call, during the project process, or after completion. She provides tactful organization and vibrancy to our Big Fish Team. Outside of the office, you can find Tanya hiking, running, practicing yoga, or even playing a family football game with her husband Ryan and their three children Nolan, Nathan and Nadia.

Chad Whelan
Exterior Renovation Consultant

Chad is an incredible roofing and siding consultant that uses his industry expertise to help our clients turn their dream renovation into a reality. Chad actually worked on our roofing crew 15 years ago while he was still in college. Chad loves serving people and has an exceptional understanding of roofing and siding products, warranties, and design and embraces the opportunity to earn your trust! Chad and wife Robin have four beautiful children: Caeden, Alanna, Caleb, and Cameron. You can find them on the playground, throwing some ball outside, or even at the gym!


Adam Rosploch
Exterior Renovation Consultant

Adam has been on the Big Fish team for 8 years! He’s an expert in exterior renovation materials and works with new clients to help them complete their dream pojects. Adam is great at helping our new clients understand their needs and works to find the perfect solution for them. A big golfer and an avid fisherman, Adam can be found spending time with his wonderful family or outside, staying active.

Paul Unferth
Window and Door Specialist

Paul was born and raised in Wisconsin (Lomira, to be exact), and then went on to earn his Business Administration degree from St. Norbert College.  

His career in construction first began over 20 years ago, and has spent the last 15 working specifically in the window/door industry—with most of those years at Pella Windows & Doors!

Paul and his wife, Katy, just celebrated their 14th wedding anniversary and have two children who keep them very busy, especially with softball and baseball! 

When he does get a little free time, Paul enjoys spending time on Legend Lake with family, or sitting in a tree stand during hunting season.

Wayne VanOoyen
Carpenter Lead

John Lapota
Insurance Specialist

The Big Fish Roofing Crew

Our roofing crew is made up of 12 hard working, dedicated, and friendly professionals with years of experience in the industry. These men are amazing to watch in action and they are full of love, joy, and have incredible work ethic! They work as tight unit to build, repair, or replace homeowner’s roofs with ease. Meet the best in the business:

Max, Julio, Estaban, Leo, Matsin, Chilito, Roberto, Luciano, Jorge, Lucas, Nico, and Chicito!

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