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The report identifies that U.S. residential solar PV installation labor is significantly less efficient than in Australia and Germany, with U.S. installers averaging 9.4 labor hours per kW compared to 6.1 in Australia and 4.3 in Germany. It argues that the U.S. can reduce its installation time to approximately 7 labor hours per kW by adopting four key interventions: optimizing pre-installation, redesigning base installation (especially for clay tile roofs), using integrated racking, and reducing the number of system meters. The document attributes Australia's success to high market competition, a flat-rate payment structure for installers, and a regulatory environment that minimizes permitting and interconnection costs.

The report analyzes the cost gap between U.S. and German residential solar installations, finding that U.S. installation labor costs are significantly higher due to non-value-add activities, complex racking processes, and regulatory requirements. Through a 'time and motion' study of 26 sites, the authors identify opportunities to reduce costs by adopting one-day installations, simplifying racking bases, and innovating AC electrical circuits. The report argues that by removing non-value-add activities, U.S. installers could reduce soft costs by 30% and lower total system costs to $4.43/W.