Home Addition Cost Calculator
Estimate your home addition project cost using 2026 national pricing data by addition type, size, and finish level.
2026 Pricing Data
8 Addition Types
Regional Adjustment
Standard room addition: $125–$250/sq ft (2026 national avg)
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Estimated Total Cost Range
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$0Low $/sq ft
$0High $/sq ft
This estimate is for budgeting purposes only. Final costs depend on site conditions, contractor selection, local permit fees, and specific design choices. Always get 3 contractor quotes. Add 15-20% contingency.
2026 Home Addition Cost by Type
| Addition Type | Low ($/sq ft) | High ($/sq ft) | Typical Size |
|---|---|---|---|
| Standard Room | $125 | $250 | 200-500 sq ft |
| Bedroom | $150 | $300 | 150-300 sq ft |
| Bathroom | $200 | $400 | 50-120 sq ft |
| Kitchen | $200 | $400 | 100-300 sq ft |
| Second Story | $200 | $500 | entire floor |
| Sunroom / Porch | $80 | $200 | 100-400 sq ft |
| Garage Conversion | $50 | $200 | 200-600 sq ft |
| Basement Finishing | $30 | $100 | 500-1500 sq ft |