I'm currently working with an agency outsourcing me work. They pretty much outsource all of their web work to me, I'm trying to figure out my rate per project. Most sites I build for them are on WordPress with a customised back-end so it's very easy to update, I put a lot of detail into that. I believe my work to be of a very good quality with regards to responsive design, code, testing and design details such as spacing, alignment, typography etc.
For most of their projects, they have a graphic designer who designs the initial design in PSD format for the desktop version to help give me a design to base off. I will then take this design (trying to adhere to it), adapt it where I see fit, make it responsive and develop it onto a fully functioning WordPress website. Most of these sites will usually have a full blog/news section as well.
What sort of percentage per project (like the above) do you think I should be looking at? As I believe I'm doing the bulk of the work. I even deal with some of the client liaison.
Many thanks, Aaron