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Cost

The original estimated cost for building Fallingwater was $35,000. The final cost for the home and guest house was $155,000, which included $75,000 for the house; $22,000 for finishings and furnishings; $50,000 for the guest house, garage and servants' quarters; and an $8,000 architect's fee. From 1938 through 1941, more than $22,000 was spent on additional details and for changes in the hardware and lighting.

The total cost of $155,000, adjusted for inflation, is equivalent to about $ 3.4 million in 2023. The cost of the house's restoration in 2001 was estimated to be $11.5 million (approximately $ 19.8 million in 2023).