Various embodiments related to delivery of advertising content for video on-demand are disclosed. One example embodiment comprises receiving a set of VOD metadata including a first configuration of ad avails to be included in a VOD content item. The first configuration specifies a first set of locations of ad avails and a size of each ad avail in the first configuration. The method further includes comparing the VOD metadata to a set of one or more policy rules specifying a second configuration of ad avails to be included in the VOD content item, the second configuration of ad avails specifying a second set of locations of ad avails and a size of each ad avail in the second configuration. The method further includes determining a number of advertisements to be included in the VOD content item based upon a result of the comparing and obtaining an ad decision.