Chesterfield and Staveley fire crews were called out to a flat fire.
The blaze was discovered on Oakamoor Close, Chesterfield, about 9am, on Tuesday, February 12.
Crews used a hose reel jet and breathing apparatus to extinguish the fire and Derbyshire fire service confirmed the cause had been accidental.
A Derbyshire fire service spokesman said the incident involved a fire in a ground floor flat.
Crews made the flat safe by 9.20am.