  In this study, we try to generalize Bruhat-Tits's theory to the case of a
Kac-Moody group, that is to define an affine building for a Kac-Moody group
over a local field. Actually, we will obtain a geometric space wich lacks some
of the incidence properties of a building, so that it is called a hovel,
following Guy Rousseau's terminology. Hovels have already been obtained for
split Kac-Moody groups by Guy Rousseau and St\'ephane Gaussent; here we define
them for any group with a (generalized) valuated root datum, a situation wich
contains the Kac-Moody groups over local fields, split and nearly split.
