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ADU Builders & Contractors in Marathon, FL

Building an ADU in Marathon? You'll find 5 licensed contractors in the area, ready to help. Marathon's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.

📊 ADU Quick Facts for Marathon

Avg. Cost/sqft

$157-$307

Permit Timeline

30-90 weeks

Max Size

1000 sqft

Setbacks

5ft sides

Top 5 ADU Contractors in Marathon

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#1Lighthouse Home Services llc

Marathon, FL

Lighthouse Home Services llc — licensed ADU contractor in Marathon, FL.

View Profile📞 (954) 551-1207
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#2Keys All Area Roofing, INC

Marathon, FL

Keys All Area Roofing, INC — licensed ADU contractor in Marathon, FL.

View Profile📞 (305) 743-4400
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#3Keys All Area Roofing, INC

Marathon, FL

Keys All Area Roofing, INC — licensed ADU contractor in Marathon, FL.

View Profile📞 (305) 743-4400
🏗️
#4Lighthouse Home Services llc

Marathon, FL

Lighthouse Home Services llc — licensed ADU contractor in Marathon, FL.

View Profile📞 (954) 551-1207
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#5Todd's Contracting

Marathon, FL

Todd's Contracting — licensed ADU contractor in Marathon, FL.

View Profile📞 (786) 492-2337

💰 How Much Does an ADU Cost in Marathon?

Garage Conversion

$43,500 - $103,500

Converting existing garage to living space

Detached ADU

$107,000 - $257,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$597 - $3,097

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple Marathon contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Marathon

How much does it cost to build an ADU in Marathon?▼
The average cost to build an ADU in Marathon ranges from $107,000 to $257,000, or approximately $157 to $307 per square foot. Garage conversions typically cost $43,500 to $103,500.
How long does it take to get an ADU permit in Marathon?▼
The ADU permit process in Marathon 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 Marathon?▼
In Marathon, 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 Marathon?▼
Marathon 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 Marathon?▼
No parking is required for ADUs in Marathon 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.

Also See ADU Contractors In

Miami (224)Tampa (223)Jacksonville (121)Orlando (117)Naples (110)Sarasota (103)Fort Myers (91)Cape Coral (83)

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