Bristol City Council have released potential costs for libraries in group 3 (or “those outside of groups 1 and 2” as they seem determined to call them), and it makes for interesting reading.
BristolLibraries group3 costings March 2015
For example, one of the costs to Eastville Library is for changing from single to double glazing. While this is obviously important enough to be included in the future costings, when it comes to Sea Mills, there is no mention in the “works undertaken in recent years” that it has had this costly upgrade already.