  The aim of this paper is to prove $\Gamma^{1,\alpha}$ Schauder estimates near
a $C^{1,\alpha}$ non-characteristic portion of the boundary for $\Gamma^{0,
\alpha}$ perturbations of horizontal Laplaceans in Carnot groups. This
situation of minimally smooth domains presents itself naturally in the study of
subelliptic free boundary problems of obstacle type, see [15].
