I've had 2 guitars re-fretted within the last year and a half.
1) Check the references for the luthier you choose. Re-fretting is complicated and tedious and requires many measurements and attention to minute details. Communicate your needs clearly with the luthier before any work is done.
2) Most luthiers will give you the choice of fret wire thickness and height. (Les Pauls have a standard size if you so choose.)
3) The fees start around $200.00 and go up depending on the fret wire used and wether or not the neck will need to be re-laquered. (ala fender Strat maple neck)
4) You must specify what string gages you will be using after the re-fret. If you plan to drop tune or up the string gage diameters (or both), The luthier need to know this in advance because it dictates how they will finish and crown the frets as well as adjust the truss rod before final sanding and fret finishing.
5) Don't expect it to be fast. I've had to wait 4-6 weeks on turn around.
6) If done right, it will be worth every penny you spent because it will make the instrument enjoyable to play again.
I hope this helps.
