Attached in-law wing vs Detached in-law cottage
Both house aging parents or adult family with privacy from the main household; construction approach, daily privacy, and caregiving access differ.
Attached in-law wing
Connected to main house
Detached in-law cottage
Separate small structure
How they stack up.
| Dimension | Attached in-law wing | Detached in-law cottage |
|---|---|---|
| Cost (typical) | $140,000–$320,000 | $180,000–$400,000 |
| Daily privacy | Moderate; shared wall + connecting door | High; separate building |
| Caregiving access | Easy; same building | Walking distance |
| Sound isolation | Depends on construction detail | Inherent |
| HVAC zoning | Separate zone recommended | Independent system |
| Future rental potential | Restricted (often shares main entrance) | Strong |
Attached wing is the right call when aging parents need close caregiving access (memory issues, mobility challenges) and when the main household's routine accommodates the connected configuration.
Detached cottage is the right call when independence is the priority, when the lot supports the footprint, and when long-term rental conversion is anticipated.
- Florida ADU rules update 2026
- FBC R310 egress, R311 stair compliance
Tivey services for this work.
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