32 lines
1021 B
Markdown
32 lines
1021 B
Markdown
---
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id: 2026-05-26T19:13:25-0400
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title: 2026-05-26 19:13:25
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tags: []
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daily: "[[2026-05-26]]"
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---
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# 2026-05-26 19:13:25
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## Number of Units as an Estimate Parameter
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In [[pdi-estimating]] there is an expectation
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that certain project costs are best predicted
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as a function of the number of dwelling/sleeping units.
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Some of these are quite unintuitive,
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especially feeders and switchgear.
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As a primarily residential contractor with visions of breaking out,
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it is vital that we develop more market agnostic heuristics.
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To my investigation,
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preference for unit count over area as a parameter
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may never be well founded,
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and is perhaps evidence of a correlation assumed rather than measured.
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The relationship between unit count and total building area
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is in the concept of **building efficiency**,
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the ratio of **net saleable area** to **gross area**.
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When we see correlation in cost and unit count
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what we're actually observing
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is the correlation in cost and gross area,
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through the correlation in gross area and unit count.
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