Fire caused $150,000 damage to a second-floor apartment at a Makiki four-story walkup building that was reported at 4:45 p.m. Monday.
Fire Capt. Terry Seelig said the family had just gotten home and discovered smoke coming out of Unit 201 at 1436 Kewalo St. and called for help.
The first firefighters arrived at 4:48 p.m. and brought the blaze under control by 4:59 p.m. They extinguished the fire at 5:20 p.m.
A couple and their two sons, an adult and a teen, lived at the apartment. The father was exposed to smoke, but refused treatment from paramedics.
No one was injured.
Flames lapped up to the lanai above the unit, causing some heat damage to the lanai.
Fire investigators are trying to determine the cause of the fire.