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