  A technique is described that permits the robust decomposition of the bulge
and disk components of a sample of Seyfert galaxies, as well as a (control)
sample of non-active galaxies matched to the Seyferts in the distributions of
redshift, luminosity and morphological classification. The structural
parameters of the host galaxies in both samples are measured. No statistically
significant differences at greater than the 95% level are found in these
parameters according to a K-S test.
  ``Companion galaxies'' --- defined as any galaxy within a projected
separation of 200 h^{-1} kpc from the center of the host --- are identified and
their basic properties measured. A comparison between the active and control
samples in the distributions of apparent R magnitude, absolute R magnitude
(assuming the ``companions'' are at the distance of the host), projected
separation from the host, position angle relative to the host, magnitude
difference between the companion and host, and strength of the tidal parameter,
show no statistically significant differences.
  Similarly, no statistically significant differences are found between the
control and active sample host galaxies in terms of light asymmetries --- bars,
rings, isophotal twisting, etc. The implications for a model in which
interactions and mergers are responsible for inciting activity in galactic
nuclei are discussed briefly.
