More than more than 18% of the U.S. population lives in a multigenerational household, but the Wall Street Journal's Chris Kirkham reports that many houses aren't equipped for extended families. Many times local zoning regulations are the culprit.

The figures likely would be greater, experts said, if not for the labyrinth of local zoning rules designed to prevent the spread of attached apartments or Airbnb-style room rentals in settings dominated by traditional single-family homes. Local restrictions can run the gamut, from prohibitions on stoves and ovens to steep fees for separate utility hookups.

But Kirkham explains that builders are adjusting:

The restrictions have prompted some builders to offer scaled-down kitchens and dream up alternative names for the forbidden amenities buyers crave. New Home Co. of Aliso Viejo, Calif., calls second kitchens “service bars.” Woodley Architectural Group, based in the Denver area, refers to them as “convenience centers,” while Lennar Corp. calls them “eat-in kitchenettes.”

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