Police shoot Sydney man in hip

A man who was armed with a crossbow has been shot after an eight-hour stand-off with police in Sydney.

The man had allegedly barricaded himself inside his home and was armed while a woman was also inside the building.

Police were first called to the home on Pennant Hills Road in Thornleigh around 9.30am (AEST) on Friday by a person who was concerned for the man's welfare.

"Officers ... attended and attempted to speak to the 34-year-old man however he allegedly barricaded himself inside the home," police said in a statement.

"It's alleged he was armed with a crossbow."

Police set up a perimeter around the home and officers from the Tactical Operations Unit, and negotiators, attended.

Specialist officers forced entry to the home about 5.30pm where they attempted to apprehend the man.

A police firearm was discharged and the man was shot in the hip.

He was taken to the Royal North Shore Hospital for treatment for non life-threatening injuries.

The 33-year-old woman was not injured.

A critical incident team is investigating the shooting.