How to price additional license fees for 3rd parties long after initial assignment...

<p>As an architectural photographer, I try to get my client to get as many other interested parties (builders/sub-trades/etc) in on the deal- since adding an additional percentage per party (around 40%) and then splitting the cost saves them money, and compensates me more as well. But what happens after when everything is paid, and the client contacts me months later and give me a list of other companies that each want to use a couple of the photos? Do I charge the same per-photo cost as I charged the client initially, or just the 40% of the original cost I would have added if they had been involved at the beginning, or something in between? This is all assuming the usage will be similar for each additional company (just digital use for online portfolios). There can be so many factors and complications that pricing can be so overwhelming. Any thoughts are appreciated.<br>

thanks.</p>

Ooh good question. I'd go for 50-60% of the original shooting fee from each of the additional clients.