Which ADU Is Right for Your Property?
Florida homeowners build four main types of ADU. Whether a given type is allowed depends on your local zoning — here's what each costs, how long it takes, and which fits 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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