Domain walls are a type of topological defects that can arise in the early universe after the
spontaneous breaking of a discrete symmetry. This occurs in several beyond Standard Model
theories with an extended Higgs sector such as the Next-to-Two-Higgs-Doublet model (N2HDM).
In this talk, I will discuss the domain wall solution related to the singlet scalar of the N2HDM
and demonstrate the possibility of electroweak symmetry restoration (EWSR) in the vicinity of
the domain wall. Such symmetry restoration can have profound implications on the early universe
cosmology as the sphaleron rate inside the domain wall would, in principle, be unsuppressed
compared with the rate outside the wall.