VAIDIK, J.
Mother asserts that the trial court abused its discretion by ordering a de facto modification of custody to joint physical custody. Although it appears that the trial court only increased Father’s parenting time, see Appellant’s App. p. 10 (“[I]t is in the best interests of . . . [J.C.] and [C.C.] . . . that Father have additional overnight parenting time.”), (“Due to the modification of Father’s parenting time, child support must also be modified.”), we find that an increase to fifty percent of all parenting time amounts to a modification of physical custody. The dissolution decree provided Mother with primary physical custody and Father with parenting time each Monday, Wednesday, and Friday afternoon and every other weekend until C.C. turned three, at which time Father was to have parenting time one night a week and every other weekend. The trial court subsequently awarded Father parenting time each Monday and Tuesday (with J.C. and C.C. to be dropped off at school or returned to Mother’s home on Wednesday mornings) and every other weekend (including Sunday nights). We conclude that when the trial court increased Father’s parenting time to seven overnight stays during any given two-week period, it ordered a de facto modification of custody to joint physical custody.
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Mother also contends that the trial court abused its discretion by failing to modify joint legal custody to sole legal custody in Mother. As with modifications of physical custody, a trial court may not modify legal custody unless (1) the modification is in the best interests of the child and (2) there is a substantial change in one or more of the factors that the court may consider under Indiana Code section 31-17-2-8 when it originally determines custody. See Ind. Code § 31-17-2-21; Kanach v. Rogers, 742 N.E.2d 987, 989 (Ind. Ct. App. 2001). Nonetheless, another panel of this Court has stated that when considering a modification of joint legal custody, we must determine whether there has been a substantial change in one or more of the factors listed in Indiana Code section 31-17-2-15, not Section 31-17-2-8. Carmichael v. Siegel, 754 N.E.2d 619, 635 n.7 (Ind. Ct. App. 2001) (“[W]hen considering the appropriateness of joint legal custody, the relevant factors are listed in Indiana Code Section 31-17-2-15, not sections 8 or 8.5, which are relevant to physical custody determinations. Thus, strictly speaking, the standard for modifying custody in section 31-17-2-21 does not apply to modifications that affect legal custody only.”). Section 31-17-2-15 provides:
In determining whether an award of joint legal custody under section 13 of this chapter would be in the best interest of the child, the court shall consider it a matter of primary, but not determinative, importance that the persons awarded joint custody have agreed to an award of joint legal custody. The court shall also consider:
(1) the fitness and suitability of each of the persons awarded joint custody;
(2) whether the persons awarded joint custody are willing and able to communicate and cooperate in advancing the child‟s welfare;
(3) the wishes of the child, with more consideration given to the child‟s wishes if the child is at least fourteen (14) years of age;
(4) whether the child has established a close and beneficial relationship with both of the persons awarded joint custody;
(5) whether the persons awarded joint custody:
(A) live in close proximity to each other; and
(B) plan to continue to do so; and
(6) the nature of the physical and emotional environment in the home of each of the persons awarded joint custody.
We believe the view expressed in Carmichael has merit and can be harmonized with Section 31-17-2-21. The list of factors a trial court may consider when determining whether to modify custody is a nonexhaustive list. Ind. Code § 31-17-2-8 (“The court shall consider all relevant factors, including the following . . . .”). Relevant to whether a court should modify joint legal custody to sole legal custody is whether there has been a substantial change in one or more of the factors the trial court considered when making the initial award of joint custody. We conclude that a trial court must also consider the factors listed in Section 31-17-2-15 when determining whether a joint legal custody arrangement should be modified.
RILEY, J., and CRONE, J., concur.