Accessory dwelling unit cost — St. Petersburg, FL

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

The total cost for an ADU depends on whether you are building a new detached structure, converting an existing garage, or adding an attached unit. Factors like plumbing installation, electrical panel upgrades, and custom interior finishes drive the final investment. Understanding these variables early helps you determine the feasibility of your project. Exact pricing confirmed free on the call.

Frequently asked in St. Petersburg

Also serving nearby: Clearwater · Tampa · Lakeland · Plantation · North Port

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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: Kenwood, Downtown St. Petersburg, The EDGE District, Old Northeast, Gulfport — and every surrounding area.