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The worker, whose name has not been released, was taken to St. Francis Memorial Hospital's burn unit and is in critical condition, Stevens said.
The explosion and fire at 3265 Shoreline Highway was reported at 3:15 p.m. and was controlled at 5 p.m. Stevens said. It destroyed the single-story wood-frame structure.
The cause of the explosion is under investigation, Stevens said. Twenty-three firefighters from Stinson Beach, Muir Beach, Southern Marin Fire Protection District and the Marin County Fire Department responded, Stevens said.
The National Park Service, Marin County Sheriff's Office and the California Highway Patrol were also at the scene.
The fire closed Shoreline Highway until 7 p.m.
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