Every homeowner will eventually end up doing some door frame repair. A door that doesn't work properly due to sticking, or not latching, can cause problems to your security and energy costs. Thankfully, repairing a door frame isn't something to call a contractor for.
Survey The Damage
Most of the time the damage to the door frame isn't enough to get out the tools. A quick survey of the damage will tell you what needs to be done.
Is the frame cracked? Is it just pulled away? Do you need to cut it out?
Pull Away The Trim
If it is serious enough, the first step in door frame repair would be to pull the trim away from the frame. If you are lucky enough, this might just be what is keeping the door from latching. Simply plane the trim down a little, or replace it with another piece.
Inspect The Door Jamb
If you need more in-depth door frame repair, then it will be to the door jamb itself. Sometimes, after a few years, the latch can be worn out, or in the case of a break-in, broken. If you need to repair the jamb or latch:
Use a circular saw, or jigsaw to cut out the damaged area and replace it with new wood. Drill holes and chisel out the areas for the door latch and deadbolt, then replace the trim. Don't ignore a door frame in need of repair because the longer it goes untreated, the less secure your home is.