Accessory dwelling unit construction cost — St. Petersburg, FL
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
The amount you spend depends on the size of the unit, whether you are building from scratch or converting an existing structure, and the quality of your finish materials. Foundations, utility connections, and local labor rates also play a significant role. We provide exact pricing confirmed free on the call.
Frequently asked in St. Petersburg
What's the best kind of ADU for a St. Petersburg home?
How do I get an ADU permit in St. Petersburg?
How can I find a good ADU contractor in St. Petersburg?
How do I get an ADU quote for my St. Petersburg property?
Are there any ADU grants available in St. Petersburg?
Who are the best ADU builders in St. Petersburg?
What does 'accessory dwelling unit' actually mean?
An accessory dwelling unit, or ADU, is a second living space on a single-family home lot. It's like a small, separate apartment. It can be attached to the main house or a standalone structure. The goal is to provide additional housing options. This can be for family, guests, or rental income. Call us to explore ADU options for your property.
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, Beach Drive, Old Northeast, The EDGE District, Gulfport — and every surrounding area.
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