The provisions of Section R505 of IECC-RE are not adopted. The following is adopted as Section R505:
"R505 CHANGE IN USE
R505.1 General.
Any space in a residential building that is converted to a dwelling unit or portion thereof from another use shall comply with this code.
Exception: Where the simulated performance option in Section R405 is used to comply with this section, the annual energy cost of the proposed design is allowed to be 110 percent of the annual energy cost allowed by Section R405.2.
R505.2 Unconditioned space.
Any unconditioned or low-energy space in a residential building that is altered to become a conditioned space shall comply with Section R502."