The blaze broke out just before 1:30 a.m. on the 200 block of South Gulph Road.
Police on patrol spotted smoke and fire coming from the residence.
They assisted 3 people out of the house with no injuries.
Firefighters focused on the rear of the house where the flames had spread to the roof and attic.
The fire was placed under control within a half hour.
The Fire Marshal is investigating the cause of the blaze.