The Short Answer
In 2026, quality ADU projects in Tampa Bay generally start around $175,000, with most landing between $175,000 and $350,000 all-in — because an ADU is effectively a complete small residence, and size, configuration, site conditions, utilities, and finish level drive the spread.
Cost by ADU type
| ADU type | Typical Tampa range (2026) |
|---|---|
| Garage conversion | $175,000+ (highly dependent on structure, utilities & code requirements) |
| Attached ADU / suite addition | $175,000 – $275,000 |
| Detached backyard ADU | $175,000 – $350,000 |
| Luxury detached ADU | $300,000+ |
What’s inside those numbers
A detached ADU is a complete small home: foundation, roof, kitchen, bath, HVAC, and separate utility connections. Utility taps and site work are the costs homeowners most often underestimate — they can run tens of thousands before a wall goes up. Design and permitting typically add 5–10%. Our guide to ADU types breaks down which format fits which lot.
The income side of the equation
Tampa ADUs rent well as long-term units, and many owners offset most of a construction loan payment with rent. Read how ADUs generate rental income in Tampa and our guide to financing an ADU in Tampa Bay for the full math.
Getting a real number for your lot
Every parcel is different: zoning, setbacks, utilities, and access change the budget. TomCo’s free lot evaluation tells you what your property allows and what it would actually cost — before you commit to anything. Start at our ADU services page.
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What your zoning allows, what it would cost, and what it could earn — specific to your address.
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