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    Adelina Koleva

    Unit Rate Method:
    Used in earlier design phases. Typically for something repetitive, like apartments in a residence/hotel or parking spaces. Estimate price per unit, multiply by the number of units for final estimate.

    Elemental (Assemblies & Subsystems):
    Used in schematic design. Cost is estimated by breaking down the building into functional systems and adding together. I assume this is what is meant by "division" cost estimating, which probably refers to the UniFormat categories? Otherwise I don't know what that is.

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    Carie Penabad

    Many thanks.  In researching unit cost estimating could be used as early as programming.  Would the same be true for division cost estimating?

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    Adelina Koleva

    I wanted to jump back on this thread because I realized something important about unit cost estimating that I wanted to share.

    This phrase appears a lot and I have seen it in referring to both early and late stage design phases.

    Unitary calculation methods are indeed used in schematic and construction document phases. The difference is that the "unit" itself is changing between phases.

    During schematic we are using "cost per room" or "cost per area" at the building scale, often using past projects as a benchmark. This is what I have seen referred to as the unit rate method and is sometimes also referred to as "cost per unit."

    In construction documents we are looking at "cost per area" at the component scale, for example "cost per square foot" of carpet. For this we see reference to unit cost allowances in the specifications.

    I have seen this distinguished occasionally by the terms "in-place costs," "unit-in-place method," "unit-in-place costs," "fixed-in-place costs," etc. This is specific to unit cost estimating for late stage design, where the "in-place" part is referring to the building components to be installed.

    Hope this is helpful to anyone else who's been thrown off by this.

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