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 final cost of your ADU is influenced by factors like utility trenching, site excavation, and the complexity of the architectural design. Larger units or those requiring extensive foundation work will naturally cost more than simple interior conversions or small studios. We help you prioritize your budget items to get the most value out of your square footage. Exact pricing confirmed free on the call.
Frequently asked in St. Petersburg
What are the disadvantages of ADUs in St. Petersburg?
In St. Petersburg, common disadvantages to consider for ADUs include potential impacts on your property's yard space and the added responsibility of managing another rental unit. Homeowners also need to be aware of how an ADU might affect their homeowner's insurance premiums or local utility bills. Discussing these practicalities with a local specialist is always a good idea.
How much does an ADU cost in Florida?
The cost of an ADU in Florida, including St. Petersburg, varies greatly based on its size, design, and the materials used. Expect costs to fluctuate depending on whether it's a detached unit or an attached addition, and the complexity of the plumbing and electrical work. Site preparation and permitting fees also play a role. A personalized estimate is the best way to determine your specific costs.
What are the rules for ADUs in Florida?
Florida has been updating its laws to make ADUs more accessible, but specific rules in St. Petersburg still apply. These typically cover aspects like minimum lot sizes, maximum square footage for the ADU, and requirements for off-street parking. Working with a local professional who understands St. Petersburg's zoning code is essential to ensure compliance.
Is an ADU allowed in Maryland?
Our services are focused on the St. Petersburg, Florida area. Maryland has its own unique set of regulations and approval processes for accessory dwelling units. If you're interested in ADUs in Maryland, you would need to connect with a service provider who specializes in that state's specific building codes and zoning ordinances.
What are the rules for ADU in California?
California has enacted many laws to promote ADUs, often setting statewide standards that municipalities must follow. These rules typically cover things like reduced parking requirements and streamlined permitting. However, these regulations are specific to California. For St. Petersburg, you'll need to rely on local expertise that understands Florida and St. Pete's specific ADU ordinances.
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. Pete, Kenwood, Beach Drive, Old Northeast, Jungle Terrace, Crescent Lake — and every surrounding area.
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