As a general idea this is what I charge:
General Playing Order (Mini Service):
Without dismantling, check for leaks and re-seat pads, adjust and regulate all key work. Lubricate and test play.
Clarinet: ?40.00
Service:
Complete dismantle, clean body and keywork, check all corks and springs (replace up to 1 spring and 2 pads), reassemble, re-seat all pads, regulate keywork, oil, adjust and test.
Clarinet: ?60.00
Re-pad:
As above but with all pads replaced for new ones. We use Lucien deluxe pads as standard or you can upgrade to leather (clarinets only). If you require a specific pad brand - please let us know! We can accomodate most requests, but there will be a delay of around 3 days for them coming into stock.
Clarinet: ?120.00 (with Lucien deluxe pads), Full leather re-pads available on request, P.O.A.
Full Overhaul:
As service but with all pads, key felts and corks being replaced.
Clarinet: ?150.00 (with Lucien deluxe pads)
From researching what others charge, our prices fall in line with must repairers in our area but London shops seem to charge much more. E.G. Howarths. Often instruments fall between the two brackets of "Service" and "Re-pad" but some people prefer to have the whole lot re-padded.
My advice is to see what a repairer would quote

Assessments SHOULD be free of charge.