Which ADU Is Right for Your Property?
Four types of ADUs are permitted in Florida. Here's what each costs, how long it takes, and which is right for your lot.
Detached Backyard Cottage
Size
400–1,000 sq ft
Cost
$150,000–$280,000
Timeline
8–18 months
Best For
Large lots with rear yard space
Pros
- + Maximum rental income
- + Separate entrance
- + Full privacy
Cons
- - Requires rear setbacks
- - Most expensive option
Garage Conversion
Size
300–600 sq ft
Cost
$50,000–$120,000
Timeline
3–7 months
Best For
Homeowners with underutilised attached or detached garage
Pros
- + Existing foundation and walls
- + Fastest permit approval
Cons
- - Lose garage space
- - Size limited by existing structure
Attached Addition
Size
300–800 sq ft
Cost
$90,000–$200,000
Timeline
6–12 months
Best For
Multigenerational living, aging parents, adult children
Pros
- + Shared utilities reduce costs
- + Feels connected
Cons
- - Less privacy
- - Requires structural integration
Modular / Prefab ADU
Size
400–800 sq ft
Cost
$129,000–$200,000 installed
Timeline
12–26 weeks from order
Best For
Speed, predictable costs, simple flat lots
Pros
- + Fast installation (10 days on site)
- + Hurricane-rated
- + Fixed price
Cons
- - Less customisation
- - Delivery logistics required
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