We will agree a cost for the job before I commence work.
I use the Society of Indexers recommended minimum rates (below) as a starting point. Please note that these rates apply to less specialised texts, and my fee will be determined on a commission-by-commission basis by:
the complexity and length of the text being indexed
the complexity and length of the index produced
any requirement to produce an embedded index
how tight the turnaround time is
I will usually ask to see a sample chapter or two before confirming my fee. This will also provide the opportunity to discuss any specific indexing requirements you have (e.g. treatment of cited authors, personal/place names, and titles of creative works), and for me to make suggestions if appropriate.
Society of Indexers indexing rates (updated Jan 2021)
£26.15 per hour / £2.95 per page / £7.90 per thousand words of text