A method and system for building/updating grammars in voice access systems is disclosed. The method includes receiving a grammar update request from a voice access system, retrieving data, filtering the data and providing the filtered data to the voice access system. The grammar update request identifies a navigation context of a user interface provided by a data system. The user interface provides access to information in the data system. The data is retrieved from the data system and pertains to the navigation context. The filtering is performed to obtain filtered data pertaining to user interface (UI) objects enabled for grammar updates.