A faulty extension cord started a fire yesterday that caused $450,000 damage to a home in Waipahu, firefighters said.

The fire at 94-449 Hiahia Loop started in a spare bedroom of the four-bedroom home about 2 p.m. and destroyed the home.

Two people were inside at the time. A man was injured when he went back into the house to rescue an elderly woman, who was already outside the burning building.

He was taken to the hospital for observation and released.

The American Red Cross helped the three residents.

Damage was estimated at $450,000.