Cost to build accessory dwelling unit — 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 expense of building an ADU varies based on site preparation, whether you need to run new sewer or electrical lines, and the level of interior customization you choose. Larger custom builds naturally require more materials and labor than simpler conversions. We provide exact pricing confirmed free on the call.
Frequently asked in St. Petersburg
What does ADU stand for in St. Petersburg?
ADU stands for Accessory Dwelling Unit. In St. Petersburg, this means a smaller, separate living space on your property. Think of it as a guest house, in-law suite, or rental unit. It's a great way to add value and flexibility to your St. Pete home. We can help you understand all the details.
Are ADUs allowed in St. Petersburg?
What's the most expensive part of building an ADU in St. Petersburg?
Generally, the foundation and the structural framing are significant cost drivers for ADUs in St. Petersburg. Utility connections, like plumbing and electrical, can also add up. The materials you choose and the complexity of the design will impact overall expenses. Getting a detailed quote from a local pro is the best way to know for your specific project.
How much does it cost to build a 1200 sq ft ADU in St. Petersburg?
The cost to build a 1200 sq ft ADU in St. Petersburg varies widely. Factors like site preparation, chosen finishes, and foundation type play a big role. Utility hookups and permit fees also contribute. For an accurate estimate tailored to your specific St. Pete location and needs, it’s best to get a personalized quote.
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.
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