Perovskite solar cells have been discussed as a low-cost alternative to traditional technologies based on the simple deposition mechanisms and inexpensive materials. These materials include metal oxides that are relatively straightforward to manufacture and can be suspended in inexpensive solvent systems including water, alcohols and aromatic hydrocarbons. However, these solvents are not appropriate for the perovskite materials and hence most efforts do not include the deposition of a metal oxide onto a perovskite. In this talk we will discuss the avenues to establish direct deposition of metal oxides onto a perovskite. This includes solvent choice, metal oxide choice, ligands and interfacial layers. The talk will then demonstrate the successful deposition of metal oxides by scalable solution phase processes with efficiencies greater than 18%. Results will include means to assess the potential damage to the films with an emphasis towards scalable manufacturing.