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Typical Utah ADU planning ranges
Build cost only, excluding land, with the default site, design and permit allowances and mid-level (Signature) finishes. Planning assumptions, not bids.
| ADU type | Size | Planning range |
|---|---|---|
| Basement / internal suite | 700 sq ft | $80,000 – $115,000 |
| Garage conversion | 450 sq ft | $65,000 – $95,000 |
| Detached backyard ADU | 600 sq ft | $115,000 – $165,000 |
| Larger detached ADU | 900 sq ft | $170,000 – $240,000 |