arc fault breakers required

[pilot]

If a new service is upgraded 100 amp fuses to 100 amp breakers
are arc fault breakers required when there was none in the original installation?
I know that the bedrooms must be protected with arcfault breakers in a new building (no problem) but with a older building separating circuit may involve a lot of extra work ,so if it is required when upgrading to breakers then I should price accordingly.
thanks for the help,I really appreciate it

[Cosimo Diano]

You do not need to install arc fault breakers if they were not installed in the first place.

[Cosimo Diano]

Let me make it clearer. If the permit for the wiring of the bedroom receptacles is dated for April 25, 2002 or earlier, arc fault protection would not be required.

[pilot]

THANKS COSIMO
that clears things up for me