Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
The cost to build an ADU depends on factors like your foundation type, utility connection distances, interior finish choices, and whether you are doing a detached build or a garage conversion. We provide an exact pricing confirmed free on the call.
Frequently asked in St. Petersburg
What are the disadvantages of ADUs?
Potential disadvantages of ADUs include the upfront cost of construction and the need to navigate local zoning regulations, which can sometimes be complex. There might also be concerns from neighbors regarding parking or privacy, though thoughtful design can mitigate these. Ongoing maintenance and increased utility bills are other factors to consider. Despite these, many find the benefits compelling.
How much does an ADU cost in Florida?
The cost for an ADU in Florida, including St. Petersburg, can range significantly. A basic garage conversion might be less costly than a custom-built, stand-alone unit. Key cost drivers include the unit's square footage, the quality of materials used, and the site's specific needs for utilities and foundation work. A personalized quote is the best way to get an accurate figure.
What are the rules for ADUs in Florida?
Florida has been encouraging ADUs, but specific rules are often set at the local level, so checking with St. Petersburg's planning and zoning department is crucial. Common regulations involve setbacks from property lines, maximum unit size, and parking requirements. Understanding these local ordinances ensures your ADU project complies with all requirements.
Is an ADU allowed in Maryland?
This inquiry appears to be about a different state. In Florida, including St. Petersburg, ADUs are generally permitted, but local regulations dictate the specifics. It's always wise to consult directly with the city's building department to confirm all applicable rules and requirements for constructing an ADU in your specific location.
What are the rules for ADU in California?
California has state-level laws that generally permit ADUs, often overriding stricter local ordinances to promote their development. These laws typically cover minimum unit sizes, owner-occupancy rules, and aim for streamlined permitting. If you're interested in ADUs in California, it's important to stay updated on the latest state legislation and any local addendums.
California has implemented various financial incentives, such as grants and low-interest loans, to make ADUs more accessible. It's best to check current state housing authority websites for the most up-to-date information on available ADU funding in California.
Also serving nearby: Clearwater · Tampa · Lakeland · Plantation · North Port
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of St. Petersburg — population 263,553; about 4,264 residents per square mile across 61.8 sq mi.
Neighborhoods served in St. Petersburg: Downtown St. Petersburg, Snell Isle, Old Northeast, Crescent Lake, Beach Drive, Gandy — and every surrounding area.
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