It happened around 3:40 a.m. on Wednesday in the 1800 block of East Thayer Street .
Police arrived to find a 55-year-old man shot several times in the leg.
They say the man was climbing a ladder in the rear of the home when the 22-year-old homeowner saw him and fired shots.
The 55-year-old continued to climb the ladder, went onto a second-floor roof and forced his way into a home next door.
Police took the man into custody.
He's being held as a prisoner while being treated for his gunshot wounds.
So far, no charges have been filed against homeowner.