  It is fundamental in number theory to calculate lower bounds for height
functions. Grizzard studied lower bounds for the Weil height in a relative
setting. Vidaux and Videla introduced the Northcott number for a set
$A\subset\bar{\mathbb{Q}}$. It bounds the Weil height on $A$ from below,
outside the zero-height points and the finitely many small-height points.
Pazuki, Technau, and Widmer introduced the weighted Weil heights. These heights
generalize both the absolute and relative Weil heights. In this paper, we
introduce a relative version of the Northcott number related to the weighted
Weil height. We also give a field extension whose Northcott number equals a
given positive number. The work is a relative version of the previous work of
the author and Sano on the Northcott numbers for the weighted Weil heights.
