1021 B
id, title, tags, daily
| id | title | tags | daily |
|---|---|---|---|
| 2026-05-26T19:13:25-0400 | 2026-05-26 19:13:25 | 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.