PHIUS+ is a passive building multi-attribute certification program and performance-based standard that combines a thorough passive house design verification protocol with a stringent quality assurance and quality control (QA/QC) program.  The certification program is administered and managed by Passive House Institute US (PHIUS).

Application of the performance-based passive building standard, project testing, inspections and certification are conducted by third-party RESNET approved HERS (home energy rating system) raters who are trained by PHIUS to work on PHIUS+ projects.

PHIUS+ is the largest, fastest-growing passive building certification program in North America.  It is also used in various other countries worldwide.