  We exploit the recently described property of cluster adjacency for
scattering amplitudes in planar $\mathcal{N}=4$ super Yang-Mills theory to
construct the symbol of the four-loop NMHV heptagon amplitude. We use a
manifestly cluster adjacent ansatz and describe how the parameters of this
ansatz are determined using simple physical consistency requirements. We then
specialise our answer for the amplitude to the multi-Regge limit, finding
agreement with previously available results up to the next-to-leading
logarithm, and obtaining new predictions up to
(next-to)$^3$-leading-logarithmic accuracy.
