Buffalo Grove fire crews responded to a garage fire in the 600-block of Woodhollow Lane before 10:20 a.m.
When they arrived, firefighters found there was an ongoing house fire.
One person was found inside, and pronounced dead on the scene, the spokeswoman said.
The fire was brought under control in about 30 minutes, but fire crews remain on the scene.
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Officials did not immediately provide any additional information about the person who died.
An investigation is underway.
Images of the fire show large flames coming from the home's garage, while two cars were parked in the driveway. Heavy, black smoke was also visible.