We have a system of peer editing and proofing that makes sure that all work that goes out is of the highest quality. So any draft that you receive will have been read and vetted by at least two of our writers to ensure that there are no mistakes.
Do note however that proofreading is limited to ensuring correct spelling, grammar and punctuation. It does not involve high-level copyediting such as rewording passages to improve style and coherence, pointing out problematic areas, making editorial suggestions, and developmental consultancy.
For such editorial services, please consult our Book Doctoring and Developmental Editing pages.