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+---
+tags:
+  - estimating
+  - software
+---
+# Construction Estimating Software
+
+## Why Not Excel?
+
+### "Spreadsheet Syndrome"
+
+Organizations are often hesitant to use excel for complex calculations due to:
+
+* perceived risk of programming errors
+* belief that specialized software is inherently superior
+
+#### Rebuttal
+
+* Estimating software is doing very simple math under the hood.
+* Commercial software is not without risk of bugs.
+* Existing implementations hardly qualify as specialized.
+
+The idea that specialized software ought to be preferred over monolith spreadsheets is well-founded,
+however, it is the case with construction estimating software
+that the proprietary options are functionally identical to a particularly involved workbook,
+except that they can not be modified to fit new use-cases.
+
+### Material Pricing
+
+Apps generally assume users will utilize material pricing services like Supplier Xchange for precise pricing.
+
+## A Minimal Implementation
+
+1. Resolve Takeoffs
+2. Extend Items
+3. Labor Extension
+
+Suppose a minimal
+
+```json
+[
+	{
+		"type": "takeoff",
+		"attributes": {
+			"length": 20
+		},
+		"assemblies": [
+			{
+				"item": "EMT Conduit",
+				"factor": 1
+			},
+			{
+				"item": "EMT Connector",
+				"factor": 1
+			},
+		]
+	}
+]
+```
+
+```json
+{
+	"attributes": {
+	},
+	"products": [
+		{
+			"manufacturer": ""
+		}
+	]
+}
+```