  The doubled formulation of the worldsheet provides a description of string
theory in which T-duality is promoted to a manifest symmetry. Here we extend
this approach to $\mathcal{N}=(2,2)$ superspace providing a doubled formulation
for bi-Hermitian/generalised K\"ahler target spaces. The theory is described by
a single function, a doubled-generalised K\"ahler potential, supplemented with
a manifestly $\mathcal{N}=(2,2)$ constraint. Several examples serve to
illustrate this construction, including a discussion of the $\mathcal{N}=(2,2)$
description of T-folds.
