Range from the cheapest fitting of bespoke bookshelves £740 (Jay Property Service based in NW10) to the dearest fitting of bespoke bookshelves £1,200 (F H Heating based in NW8).
Comparing carpenter and joiners estimates for having bookshelves fitted gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to fit bookshelves in W9 by posting a job with HaMuch and we will send it to carpenter and joiners in W9.

"Fitted bookcase – We would like to have fitted bookcases in the two alcoves to the left (91 cm width ) and right (100 cm width) of a fireplace."
W9
"I am looking to recreate this merchandising wall: https://images.app.goo.gl/jriDgP82XzHaLiiL7 I need it to be about 240cm high by 400cm long. I would like the pegs and shelving to be made also. I would then like it painted and attached to the wall in the office. Deadline 9th October"
W1H