I produce bespoke costings for every project rather than supplying a rate card. In my experience, the requirements of each job often vary enough that both client and editor get a fairer deal this way.
The Society for Editors and Proofreaders offer a set of FAQs that inform potential clients of the benefits of employing a professional editor, and a general idea of the cost. You may read them HERE. Whether you’re working with me or not, this is a great place to find out more about editing and proofreading.
If you’d like to discuss a project in more detail, please contact me HERE.