Interior remodel static cost scenario
Home Addition Cost in St. Louis, MO
The modeled typical cost is $100,639, with a planning range of $70,447 to $162,028 for St. Louis, MO.
Computed cost breakdown
| Line item | Arithmetic basis | Amount |
|---|---|---|
| Materials | 400 sq ft × indexed material rate | $51,568 |
| Labor | 400 sq ft × indexed labor rate × 1.08 | $42,471 |
| Permits | Baseline allowance | $3,800 |
| Disposal | 400 sq ft × disposal rate | $2,800 |
| Typical total | $100,639 | |
Low $70,447 · Typical $100,639 · High $162,028
Difference from the parent scenario
St. Louis, MO uses a 1.08× labor factor, 8.1% above the national wage factor. The resulting total is 3.3% above the parent national total because materials and fixed allowances do not change.
Open the interactive home addition cost to change quality, scope, contingency, or ZIP.
St. Louis, MO metro calculation record
St. Louis, MO is Census CBSA 41180, ranked 23 among the 50 metros evaluated for this release, with a 2025 population estimate of 2,814,421. Its BLS wage factor changes the modeled labor line from $39,281 nationally to $42,471 here, a difference of $3,190. The complete project moves from $244 to $252 per sq ft after materials and fixed allowances remain unchanged.
Primary cost controls
- Room or project size
- Finish and material tier
- Layout and structural changes
- Trade coordination and access
Questions about this scenario
What is the modeled typical cost for St. Louis, MO?
The static default is $100,639, with a planning range of $70,447 to $162,028 from the shared calculator record.
What changes from the national calculator?
Only labor uses the 1.08× metro wage factor. Materials, permits, disposal, baseline date, and index series remain tied to the parent model.
Is this a local contractor quote?
No. It is a static planning scenario generated from the public baseline store. Confirm site conditions, scope, code requirements, and price in written local proposals.