[scotchnrocks]

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But also take into account that between the 1890's and 1970's the differences in homes were much more profound than the difference between the 1970's and today. Things like indoor plumbing, electrical wiring, insulation, heating systems other than fireplaces, etc. But the index stayed near 100.

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I would venture to say that these types of improvements cost the same over time. It is the same because we would pay $x for cutting-edge plumbing in 1950, and $x (inflation adjusted) for cutting edge plumbing today, but today's technology is far superior. Kind of like the difference in computers if we spent $2k on one in 2001 and $2k on one today.