  We explore the possibility of embedding thermal leptogenesis within a
first-order phase transition (FOPT) such that RHNs remain massless until a FOPT
arises. Their sudden and violent mass gain allows the neutrinos to become
thermally decoupled, and the lepton asymmetry generated from their decay can
be, in principle, free from the strong wash-out processes that conventional
leptogenesis scenarios suffer from, albeit at the cost of new washout channels.
To quantify the effect of this enhancement, we consider a simple setup of a
classically scale-invariant $B-L$ potential, which requires three RHNs with
similar mass scales, in the ``strong-washout'' regime of thermal leptogenesis.
Here we find that parameter space which requires $M_N\sim 10^{11}\text{ GeV}$
without bubble assistance is now predicted at $M_N \sim 5\times 10^9 \text{
GeV}$ suggesting a sizeable reduction from bubble effects. We numerically
quantify to what extent such a framework can alleviate strong-washout effects
and we find the lower bound on the RHN mass, $M_N \sim 10^{7}\text{ GeV}$,
below which bubble-assisted leptogenesis cannot provide an enhancement. We also
study the signature possibly observable at GW terrestrial interferometers and
conclude that bubble-assisted leptogenesis models with relatively light masses,
$M_N \lesssim 5\times 10^9 \text{ GeV}$ may be probable.
