About Enercept:
Leaders in Custom SIP Panels and Energy-Efficient Building Systems
Building Better Since 1981
Enercept began in 1981 as a subsidiary of Energy Concept, founded by visionary Harold Henley. With a bold mission to revolutionize the building industry using high-performance, energy-efficient building systems, Henley laid the foundation for what is now a leading structural insulated panels manufacturer. Just one year later, Enercept built its own 26,000-square-foot production facility in Watertown, South Dakota — constructed entirely with the company’s own SIPs.
For over 40 years, Enercept has helped builders, architects, and homeowners simplify construction and achieve superior energy performance with custom SIP panel systems.
What Sets Enercept Apart in the SIP Industry
Enercept designs and manufactures custom structural insulated panels (SIPs) to meet a wide range of project needs — from residential homes and timber frame hybrids to commercial, agricultural, and light industrial structures. Each panel is crafted with an EPS (expanded polystyrene) foam core between two OSB (oriented strand board) skins, creating a strong, airtight building envelope that accelerates construction and dramatically reduces energy costs.
We offer SIP wall and roof panels ranging from R-14 to R-50.
Our expert in-house drafting team assists with panel layouts and design details, and our virtual support ensures that builders have the guidance needed for a smooth installation process.
Enercept holds the original patent for our insulated panel connector design, which virtually eliminates thermal bridging — enhancing efficiency and performance on every build.
Precision-Crafted in Watertown, SD
Building high-quality, energy-efficient structures doesn’t have to be complex or costly. Enercept’s SIPs are precision-crafted in our Watertown, SD facility to simplify the construction process. With superior insulation and factory-built accuracy, our SIPs help you save time, reduce energy costs, and ensure a durable, worry-free build that adds long-term value.
Proud to Support Builders Across the U.S. and Beyond
Headquartered in Watertown, South Dakota, Enercept is a proud member of the Structural Insulated Panel Association (SIPA) and the National Association of Home Builders (NAHB). Our panels are manufactured with care, precision, and commitment to sustainability — helping clients across North America build faster, stronger, and smarter.
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Get started with Enercept SIPs — your partner in smart building systems.
Whether you're an architect designing a high-performance home, a developer managing a commercial build, or a homeowner seeking energy-efficient construction, Enercept is here to help.