arXiv:2604.19555v2 Announce Type: replace Abstract: We propose an adaptive refinement strategy for hierarchical B-splines that increases the approximation power of every marked cell by at least one. Here, the approximation power of a cell is the finest level $\ell$ such that all the B-splines of level $\ell$ that do not vanish on the cell belong to the hierarchical space. This increase can be achieved with the standard refinement of hierarchical meshes, in which each cell is subdivided at most once per step, provided that the regions formed at each level by the cells with this property are nested. We call the hierarchical meshes with this nesting property \emph{weakly admissible}, characterize them, and prove that the proposed refinement preserves weak admissibility. We also prove a complexity estimate: the number of cells created along the adaptive process is bounded by a constant times the total number of marked cells. Moreover, we extend known local $L^q$ estimates for a multilevel quasi-interpolant on these meshes to Sobolev norms, showing that the local error bound on each active cell is governed by its approximation power, which supports using this quantity to drive the refinement. Numerical experiments illustrate the local gain of resolution produced by the proposed strategy, as well as its robustness with respect to the marking criterion and the marking parameter.