The most common request for repairs is for holes or tears in a customer's leather furniture, leather auto/car/RV interior, leather jacket, leather aircraft upholstery, leather or vinyl restaurant booths, etc. We have been asked to repair holes in leather desktops, leather coffee tables, and leather conference tables.
The decision to either replace or repair the damaged spot is partly determined by the location of the damage. If the hole or tear is on a seat bottom cushion or any other high-wear area, it is not recommended to repair anything larger than a 3-4 inch hole or tear since over time, the weight of a person sitting on the spot could cause it to reopen. (Note: this is assuming that the leather is not missing ie: a dog chewed it completely off).
If a hole or tear is located on a non high-wear area of the leather (ie: seat back, sides, or back) then repairs can be made to larger holes or tears. Clean cuts (ie: razor cuts) up to 12 inches or more can be successfully repaired, though the larger the cut, the more difficult it is to make it cosmetically invisible.
A cut that falls along the seam of the leather may be able to be resewn, forming a new seam. But repairs cannot be successfully done over the top of an existing seam.