Oregon Revised Statutes Public Health and Safety § 469.717

(1) Installation of the energy conservation measures must be completed within 90 days after receipt of loan funds. The State Department of Energy may provide an inspection at the owner's request.

(2) Notwithstanding the provisions of subsection (1) of this section, the department may inspect installation of energy conservation measures to verify that all loan or other state subsidy funds have been used for energy conservation measures recommended in the audit, that installation has been performed in a workmanlike manner and that materials used satisfy prevailing industry standards. If requested to do so by the department, the dwelling owner shall provide the department with copies of receipts and any other documents verifying the cost of energy conservation measures.