Daron Wyatt of Anaheim Fire and Rescue said firefighters responded to the structure fire in the 2500 block of N. Glenhaven Avenue shortly after 9 p.m. and found active smoke and flames coming from the garage of the home.
In news video, fireworks are seen going off in a nearby residential area as crews battled the flames. The blaze was declared a knockdown within 20 minutes.
Firefighters said they found debris in the street from illegal fireworks.
The official cause of the fire is under investigation but investigators suspect fireworks are a factor, Wyatt said.
The house sustained smoke and water damage inside the property, and residents were displaced for the night.
A fine for illegal fireworks in the city of Anaheim starts at $1,000.