ADU Builders & Contractors in Key Largo, FL
Building an ADU in Key Largo? You'll find 2 licensed contractors in the area, ready to help. Key Largo's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.
📊 ADU Quick Facts for Key Largo
Avg. Cost/sqft
$155-$305
Permit Timeline
30-90 weeks
Max Size
1000 sqft
Setbacks
5ft sides
Top 2 ADU Contractors in Key Largo
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Key Largo, FL
Keys Strong Construction — licensed ADU contractor in Key Largo, FL.
💰 How Much Does an ADU Cost in Key Largo?
Garage Conversion
$42,500 - $102,500
Converting existing garage to living space
Detached ADU
$105,000 - $255,000
New standalone unit (600-1,200 sqft)
Permit & Fees
$601 - $3,101
Plan check, permits, utility connections
* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple Key Largo contractors to compare pricing.
❓ Frequently Asked Questions About ADUs in Key Largo
How much does it cost to build an ADU in Key Largo?▼
The average cost to build an ADU in Key Largo ranges from $105,000 to $255,000, or approximately $155 to $305 per square foot. Garage conversions typically cost $42,500 to $102,500.
How long does it take to get an ADU permit in Key Largo?▼
The ADU permit process in Key Largo typically takes 30 to 90 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.
What are the ADU size limits in Key Largo?▼
In Key Largo, detached ADUs can be up to 1000 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.
What is the setback requirement for ADUs in Key Largo?▼
Key Largo requires 5-foot setbacks from side property lines and 5-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.
Do I need to provide parking for my ADU in Key Largo?▼
No parking is required for ADUs in Key Largo if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.
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