The average cost to build a detached ADU in Florida ranges from $180 to $350 per square foot. This means a standard 500 sq ft "Granny Flat" will cost between $90,000 and $175,000.
Cost Drivers
- Foundation: Florida soil often requires stem-wall foundations, adding cost.
- Impact Windows: Hurricane codes require expensive glazing.
- Utilities: Connecting to sewer can cost $5k-$15k alone.
Prefab vs. Stick Built
Prefab units can save time, but shipping concrete mods to Orlando or Jacksonville can eat up the savings.
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