NAIROBI, Kenya — A large mushroom farm near the Kenyan capital of Nairobi is one of a kind: It grows fungi on an industrial scale — not as food for restaurants but as a building material that some Kenyans say could make more people homeowners.

The farm produces mycelium, the root structure of mushrooms that a local company then uses to make building materials it says are more sustainable than regular brick and mortar.

The company, MycoTile, combines the roots with natural fibers and agents to make panels that can be used for everything from roof and wall insulation to interior decor, at a fraction of the cost of building with standard clay bricks. It currently produces about 3,000 square meters (yards) of such materials every month.

Street vendor Jedidah Murugi, whose house was made wit

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