Aggregation of molecular chromophores gives rise to molecular excitons, featuring a collective nature of electronic excitation as opposed to excitation of individual molecules. The excitons play a crucial role in processes of light-energy conversion. A particularly interesting class of light-triggered systems are photo-switchable materials. When photoswitch molecules are brought in close proximity to each other, exciton states are formed, as have been observed for azobenzene-containing self-assembled monolayers (SAMs) and micelles. The exciton formation has been proposed to hinder azobenzene isomerization, in addition to steric effects. Exciton states arise as delocalized states in classical theories of exciton formation in molecular crystals and in molecular dimers. Yet, conformational disorder, induced, e.g., by thermal fluctuations, has been shown to lead to (partial) localization of the exciton states in polymers and oligomers. To the best of our knowledge, this effect has not been explored for systems of aggregated photoswitchable molecules.