Home › ADU Rules by County › Collier County
How big a backyard home (accessory dwelling unit) can be in Collier County, who can build one, and who to call to confirm — from the county's published rules.
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| ADUs allowed? | Yes, with conditions |
|---|---|
| Maximum ADU size | 750 sq ft or 35% of the main home, whichever is less |
| Minimum lot size | 1 acre (43,560 sq ft) for a guesthouse |
| Owner must live on site? | Not confirmed in our records |
| Manufactured home as an ADU? | Often allowed, subject to the county's ADU and zoning rules |
A rentable 'guest unit' (ADU) is allowed by right in RE and R1-E districts, and by conditional-use approval in R1-15A, R1-15, R1-10, R1-10A. Separately, non-rentable GUESTHOUSES are allowed on lots of 1+ acre (43,560 sq ft) but may not be rented — renting one violates the LDC. Golden Gate Estates is a common ADU/guest-home area. Naples, Marco Island have their own codes.
Source: Collier County LDC Sec. 5.03.03; verified Jul 2026.
Before You Build
ADU rules are set by each county and city — Florida law (Fla. Stat. 163.31771) lets local governments allow ADUs but doesn't require it — and they can change, so always confirm the current rule with Collier County before you build.
Confirm with Collier County: 239-252-2400 · zoning department website ↗
Zoning is set locally and changes often. Answers are guidance only, not a permit guarantee. Always confirm with the local building/zoning department before purchase.
Common Questions
Yes, with conditions. A rentable 'guest unit' (ADU) is allowed by right in RE and R1-E districts, and by conditional-use approval in R1-15A, R1-15, R1-10, R1-10A. Separately, non-rentable GUESTHOUSES are allowed on lots of 1+ acre (43,560 sq ft) but may not be rented — renting one violates the LDC. Golden Gate Estates is a common ADU/guest-home area. Naples, Marco Island have their own codes.
750 sq ft or 35% of the main home, whichever is less.
Our records don't confirm an owner-occupancy requirement for Collier County — ask the county zoning department before you buy.
Often yes — many Florida counties allow a manufactured or modular home as an accessory dwelling unit, subject to Collier County's ADU size, lot, and setback rules. Confirm with the county for your parcel.
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