College - Author 1

College of Architecture and Environmental Design

Department - Author 1

Construction Management Department

Degree Name - Author 1

BS in Construction Management



Primary Advisor/Subject Matter Expert (SME)

Andrew Kline, College of Architecture and Environmental Design, Construction Management Department


This paper is a case study that identifies potential financial implications from the updated Title 24, Part 6 code requirements established in 2019 by the California Energy Commission (CEC). The CEC works closely with the California Public Utilities Commission (CPUC), who’s long term goal is to make all residential structures Zero Net Energy (ZNE) throughout the state. The CEC’s updated code requirements include mandatory measures for detached residential homes to meet Zero Net Electricity on an Energy Design Rating (EDR) basis, a step towards Zero Net Energy. The purpose of this study is to understand the additional construction costs associated with the updated regulations, and how they may differ in various regions in California. The study was conducted on Lennar Corporation, the state’s largest residential homebuilder, and sought out to identify the company’s increased construction costs for homes permitted on or after January 1st, 2020. While the new regulations differ for homes of different shapes, sizes, and location, this study only pertains to detached, two-story, 2500 SF residential homes in climate zones three, seven, and thirteen.