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Collier County, FL Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified July 2026

ADU rules in Collier County, FL, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Governing code: LDC 5.03.03 (guesthouses)
Minimum lot area: 43,560 sq ft (one acre)
Max floor area: 40% of main home living area
Renting allowed: No; leasing is a violation
Separation from home: At least 20 feet

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Florida under recent ADU streamlining laws. The Collier County, FL rules below cover local size, height, and setback requirements.

Summary

Collier County permits a detached guesthouse as an accessory use, but renting or leasing it is prohibited. It requires at least a one-acre (43,560 sq ft) lot, cannot exceed 40% of the main home's living area, and must sit 20 feet from the principal dwelling.

These county ordinances apply to unincorporated areas of Collier County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

Leasing or renting a guest accommodation facility shall constitute a violation of this LDC. ... Minimum lot area shall be 43,560 square feet. ... The maximum floor area shall be forty (40) percent of the air-conditioned, enclosed living area ... Detached guest houses shall not be closer than twenty (20) feet to the principal dwelling.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 126 | Land Development Code: Supplement 33).

Full Breakdown

Under LDC 5.03.03, a guest accommodation in a single-family district may never be used for commercial purposes, and leasing or renting one is a code violation. Site standards: minimum lot area 43,560 square feet, minimum lot width 105 feet, maximum floor area 40% of the principal dwelling's air-conditioned living area, and detached guesthouses no closer than 20 feet to the main home. A guesthouse may be built before the principal home if it meets single-family standards. A separate kitchen can reclassify it as a second dwelling unit, which single-family zoning bars. Inside Naples, Marco Island, or Everglades City, the city's own rules apply.

Violations & Fines

Renting or leasing a guesthouse violates the LDC and is handled by Collier County Code Enforcement, which can impose daily fines under Florida Statutes Chapter 162 until corrected.

Frequently Asked Questions

Can I rent out my guesthouse in Collier County?

No. LDC 5.03.03 states leasing or renting a guest accommodation facility is a violation, and it may not be used for commercial purposes in single-family districts.

How big can a Collier County guesthouse be?

Its floor area may not exceed 40% of the principal dwelling's air-conditioned, enclosed living area, and the lot must be at least 43,560 square feet.

Sources & Official References

Other rules in Collier County

Parking Rules: Overnight ParkingSignificant Restrictions Shed & Carport RulesSome Restrictions Garage ConversionsSome Restrictions Animal Ordinances: Pet Store RulesSome Restrictions Animal Ordinances: Pet Groomer RulesSome Restrictions Animal Ordinances: MicrochippingSome Restrictions Animal Ordinances: Breed RestrictionsSignificant Restrictions Animal Ordinances: Bird ProtectionHeavy Restrictions

All Collier County rules

How Collier County compares: Easiest Cities to Build an ADU·Florida rules heatmap·Compare Collier County to another location·View the Florida accessory structures overview

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