What ADU can you build in your Marco Island backyard?
Instant zoning report — see exactly what your zoning allows: permitted ADU types, size limits, setbacks, and lot requirements for your specific property.
The quick answer
Marco Island ADU rules at a glance
- Owner-occupancy
Not required — you can rent both units - Short-term rentals
Allowed with local licensing — verify with the city - Where it's allowed
Eligibility varies by zoning district — check your address to confirm yours
ADU Rules in Marco Island, Florida
We've researched Marco Island's ADU rules so you don't have to. Here's what matters most — the facts that determine whether your project is possible, and how much it will cost.
- Only a non-rental guesthouse, as a conditional use on 1-acre+ single-family lots
- Capped at 40% of the principal dwelling's air-conditioned living area
- Renting or leasing it is an express zoning violation — no rentable ADU
Last verified: 2026-07-15
Backyard ADUs like this are being built across Marco Island — here's how to do it right.
What Marco Island's zoning may allow for an ADU
Marco Island allows only a non-rental 'guesthouse,' and only as a conditional use on single-family lots of one acre or more, capped at 40% of the principal dwelling's air-conditioned living area. Renting or leasing a guesthouse is expressly a zoning violation. There is no rentable ADU pathway.
Zoning allowance
A guesthouse is a conditional use (not permitted by right) in the single-family (RSF) districts, and only where the underlying lot(s) total one acre or more (Code §30-84(3)). It is not an accessory use and requires conditional-use approval.
Size limits
'The living area of a guesthouse shall not be larger than 40 percent of the air-conditioned, enclosed living area … of the principal dwelling' (Code §30-84(3)a); detached guesthouses must be ≥20 ft from the principal dwelling; accessory height ≤20 ft.
Lot + setbacks
Setbacks, lot coverage, and minimum lot size for an accessory dwelling vary by zoning district. Confirm the exact figures with the jurisdiction's planning department.
Height + coverage
Height and lot-coverage limits vary by zoning district. Confirm current limits with local planning.
Parking
Parking requirements for an accessory dwelling vary by district; typically one additional space. Confirm with local planning.
Rental / occupancy
Renting is prohibited: 'Leasing or renting a guest accommodation facility shall constitute a violation of this zoning code' (Code §30-1011); if the main residence is rented, a guesthouse may not be occupied by the owner. No rentable ADU exists.
Permit process
An accessory dwelling is permitted through the jurisdiction's standard zoning-review and building-permit process. Contact the local planning or building department for current requirements.
Building limits and rental rules, side by side
These figures are based on the best available data for Marco Island and should be confirmed with the city's planning department before you commit to a design or a rental strategy — local ordinances change and vary by parcel.
Building Limits
- Max Size:See requirements above
- Detached Allowed?Check with city
Rental Rules
Short-term rental rules vary — confirm with Marco Island Planning.
Here's exactly what you'll pay — and how to avoid the fees that catch most homeowners off guard
Most homeowners spend 3–4 weeks piecing this together on their own. We've mapped the full Marco Island permit process step by step — so you know exactly what's coming, and what to prepare.
Step 1: Pre-Application Zoning Check
- Where:
- Marco Island Planning Department
- What to bring:
- Property address and parcel ID, preliminary site sketch, lot survey
- Timeline:
- No appointment fee — call ahead to confirm office hours
- Cost:
- No fee for initial inquiry
Step 2: Submit Permit Application
- Where:
- Marco Island Planning Department — contact for portal link
- What to bring:
- Architectural plans, site plan, boundary survey, energy compliance docs
- Timeline:
- Contact planning to confirm current review timelines
- Cost:
- Contact planning for current fee schedule
Step 3: Plan Review & Revisions
- Where:
- Marco Island Planning Department
- What to bring:
- Responses to any correction letters; revised drawings if required
- Timeline:
- Plan for one or more review cycles — timeline varies by submission completeness
- Cost:
- No additional fee for standard resubmittal
Step 4: Construction & Inspections
- Where:
- Marco Island Building Department
- What to bring:
- Approved permit set must be on-site at all times during construction
- Timeline:
- Schedule inspections as each phase of work is completed
- Cost:
- Included in permit fee
Marco Island neighborhoods where ADU permits are being filed — is your street next?
Marco Island ADU — Frequently Asked Questions
These are the questions we hear most often from Marco Island homeowners. If yours isn't here, our ADU Zoning Experts can answer it directly.
Can I build an ADU in Marco Island, Florida?
A guesthouse is a conditional use (not permitted by right) in the single-family (RSF) districts, and only where the underlying lot(s) total one acre or more (Code §30-84(3)). It is not an accessory use and requires conditional-use approval.
What is the maximum ADU size in Marco Island?
'The living area of a guesthouse shall not be larger than 40 percent of the air-conditioned, enclosed living area … of the principal dwelling' (Code §30-84(3)a); detached guesthouses must be ≥20 ft from the principal dwelling; accessory height ≤20 ft.
Do I need to be an owner-occupant to build an ADU in Marco Island?
Renting is prohibited: 'Leasing or renting a guest accommodation facility shall constitute a violation of this zoning code' (Code §30-1011); if the main residence is rented, a guesthouse may not be occupied by the owner. No rentable ADU exists.
Can I use my Marco Island ADU as an Airbnb?
Contact Marco Island Planning to confirm current short-term rental rules for ADUs.
How do I get an ADU permit in Marco Island?
An accessory dwelling is permitted through the jurisdiction's standard zoning-review and building-permit process. Contact the local planning or building department for current requirements.
Nearby Cities — ADU Rules
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This page provides general information based on current ordinances and publicly available data as of 2026-07-15. Zoning rules change — verify all requirements with your local planning department before making financial commitments.