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I use a free publication to calculate these multiples - Construction cost data is provided by RSMeans data by Gordian.
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https://www.gordian.com/tgg/rsm/pdf/2019-Change-Notice-Q1.pdf
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https://www.rsmeans.com/rsmeans-city-cost-index.aspx
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https://www.gordian.com/tgg/rsm/2019books/2019-project-costs.pdf
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visit: https://calculator.secondunitcentersmc.org/
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Use the San Mateo cost calculator and say you're in "South San Francisco"
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Take the overall cost suggested by the Cost Calculator for "South San Francisco"
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Then multiply it by the following multiplier for your city:
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CaliforniaMultiplier
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Anaheim86.5%
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Bakersfield87.3%
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Fresno93.3%
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Los Angeles83.2%
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Oakland102.8%
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Oxnard84.7%
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Redding78.5%
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Riverside79.5%
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Sacramento100.0%
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San Diego93.0%
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San Francisco100.8%
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San Jose100.8%
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Santa Barbara82.9%
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Stockton91.5%
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Vallejo96.9%
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So if I'm in Santa Barbara, and the cost calculator told me the project would cost $283,000 in South San Fran...
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I would multiply 283,000 times 82.9%
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Santa Barbara estimate:$234,607
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