LAFAYETTE (CBS SF) — A construction accident Thursday morning triggered the collapse of a home undergoing a major remodel in a Lafayette neighborhood and ignited a small fire, officials said.

The contractor told KPIX 5 his crew was demolishing a wall as part of a project to add a major addition to the home when it “created a domino effect.”

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The incident happened on the 1100 block of Via Media as the home was undergoing an expansion from 2,000 square feet to 6,000 square feet.

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Walls tumbled and much of home was reduced to a pile of lumber and debris. The collapse also struck a gas meter, triggering a small fire that was quickly extinguished.

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There were no injuries reported.