Police save man's life by kicking in his door during Sydney house fire

Four police officers have saved a man's life by kicking a door down to save him from a house fire in Sydney's south-west.

The fire broke out at 4.15am today in the bedroom of a home in Fairfield East, trapping the man inside the townhouse on Mitchell Street.

After the police officers kicked the door in, they found the man lying unconscious on the floor and lifted him out of the burning home.

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9News understands the officers suffered from smoke inhalation, but are stable after being released from hospital.

The man also suffered from smoke inhalation and remains in a stable condition.

Fire and Rescue NSW (FRNSW) extinguished the flames in 40 minutes, preventing it from spreading to other buildings, while residents evacuated from surrounding townhouses.

"The officers acted quickly to remove this man from danger, freeing him before the fire had a chance to push out from the room of origin to where he was located," FRNSW Superintendent Adam Dewberry said.

"These actions likely saved the man's life and are to be commended."

The cause of the fire is still unknown. Investigations are underway.