  We study the isometric extension problem for H\"{o}lder maps from subsets of
any Banach space into $c_0$ or into a space of continuous functions. For a
Banach space $X$, we prove that any $\alpha$-H\"{o}lder map, with $0<\alpha\leq
1$, from a subset of $X$ into $c_0$ can be isometrically extended to $X$ if and
only if $X$ is finite dimensional. For a finite dimensional normed space $X$
and for a compact metric space $K$, we prove that the set of $\alpha$'s for
which all $\alpha$-H\"{o}lder maps from a subset of $X$ into $C(K)$ can be
extended isometrically is either $(0,1]$ or $(0,1)$ and we give examples of
both occurrences. We also prove that for any metric space $X$, the described
above set of $\al$'s does not depend on $K$, but only on finiteness of $K$.
