  We present a detailed analysis of the construction of $z=2$ and $z\neq2$
scale invariant Ho\v{r}ava-Lifshitz gravity. The construction procedure is
based on the realization of Ho\v{r}ava-Lifshitz gravity as the dynamical
Newton-Cartan geometry as well as a non-relativistic tensor calculus in the
presence of the scale symmetry. An important consequence of this method is that
it provides us the necessary mechanism to distinguish the local scale
invariance from the local Schr\"odinger invariance. Based on this result we
discuss the $z=2$ scale invariant Ho\v{r}ava-Lifshitz gravity and the symmetry
enhancement to the full Schr\"odinger group.
