Passive House certification is a voluntary process of having energy calculations and details checked by an independent institution to determine if the project was planned and built in accordance with the standards. After construction, a blower-door test is required to prove airtightness; the ventilation system has to be commissioned in a verifiable way; and the general contractor has to certify that the building has been built in accordance with the drawings and specifications verified by PHIUS.
Currently, only a certification path for new construction is available. A retrofit-specific certification with different requirements is planned for late 2010.
