When did indoor bathrooms become available to the common ma?

Indoor bathrooms with flushing toilets and running water became widely available to the common man in the late 19th and early 20th centuries, as plumbing and sanitation systems improved in urban areas. Indoor bathrooms in private homes were once considered a luxury reserved for the wealthy, but by the early 20th century, advancements in public health and the spread of modern plumbing made them more accessible to the general population.