Masterfiles are a set of approved architectural, structural, or trade drawings that can be used throughout the county without having to submit a full set of plans for each lot on which a structure is built. They are typically used by developers for single family dwellings or townhomes. However, Masterfiles can also be used for commercial projects where the same installation or repair will occur on multiple commercial properties, such as balcony repairs or washer/dryer installations in apartments.