Developmental editing looks at the structure of your manuscript and helps the author with any difficulty he/she is having with dialogue or continuity, flow and character development.
If you are unsure about the direction of your story, how your characters are working together and whether the plot is effective then a developmental edit would really help.
Developmental edits don’t include proofreading or copy editing and it is often a good idea to have a combination of services, especially with a first novel or story.
A developmental edit is more expensive than other forms of editing because it involves a large amount of work and as such is time consuming. However, a lot of writers find a developmental edit to be very beneficial in discovering their strengths and weaknessess and improvements can be made for the betterment of future work.
The cost of a development for a book in excess of 60,000 words will cost approximately €700 ($827)