What does it typically cost to maintain a previously-developed map or diagram?

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Costs will necessarily vary depending upon the the quality of the editable artwork we receive and the overall number of modifications that are being requested. The size and scope of a project will also greatly affect the pricing for these particular types of services, as modifications for an 8-10 building property are dramatically different than modifications for a 200-300+ building property. In all instances, we would simply apply a flat hourly rate for our design work, discounting rates as the volume of work being requested increases (generally in 50-100 hour quantities). Most maintenance projects we have been involved with have only entailed roughly 5 to 10 hours of design work, however, with costs of between $200 and $500 per image. Of course, this is simply a rough estimate from past experience...as every mapping project presents its own unique issues and challenges.