I can’t give you a ballpark figure, but hopefully I can help you figure out the way to come to one!
First thing I recommend is documenting the scope of the project.
Once you have the scope documented, I would recommend looking into soliciting proposals from vendors. The reality is, if there’s limited knowledge within the organization, it’s best to bring on vendors to help with any of the processes. You may need more than one depending on your needs (I’ll say in my experience, most of the large Accessibility training/audit companies have no experience with EPUB). There are places that specialize in EPUB and publishing, you might need a few to get you to a complete program. My company uses 3 vendors to meet all of our needs, so it’s not unusual.
The proposals will help give you an idea of cost. When I went through this process before, the ranges of cost did vary a bit, so you will have options. What I do advise is considering the philosophy of your approach as well, you want vendors that align with your philosophy. If you’re looking for born accessible processes with a goal of increasing inclusivity, you might not want a vendor that focuses only on compliance for instance.
If you’re getting pressure to give an upfront estimate to give to management before getting proposals, you’re looking at likely 100-150k minimum (though you’re in the UK, this may be more like 80-120k in pounds, I’m in Canada).
Once you have proposals, it’s a bit easier to really figure out what you need and you have real numbers to work with. It can also help with planning, you may have to space projects out to fit budgets or do things sequentially while waiting on training, etc. Having the information is really helpful though.
I hope this helps!
September 9, 2022 at 9:28 am