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Which of the following is not a requirement for an accessible washroom in a residential building?

  1. Grab bars

  2. Barrier-free entrance

  3. Sink with knee clearance

  4. Bathtub with built-in seat

The correct answer is: Bathtub with built-in seat

Accessible washrooms in a residential building require certain features to accommodate individuals with disabilities. Grab bars and a barrier-free entrance are necessary for individuals with mobility impairments, while a sink with knee clearance allows for individuals using wheelchairs. However, a bathtub with a built-in seat may not be necessary for individuals with disabilities as it may not provide enough support or may not be compatible with different types of disabilities.