Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in St. Petersburg, FL? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve St. Petersburg and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

The cost of building an ADU depends on your choice of materials, the square footage, and whether you are doing a garage conversion or a new detached build. Site access and utility upgrades also play a big role in the final bill. Exact pricing confirmed free on the call.

Frequently asked in St. Petersburg

What are the disadvantages of ADUs?

Potential disadvantages include the initial investment in construction and the impact on your property's existing space. You should also consider how an ADU might affect privacy and utility costs. Careful planning is essential to maximize the benefits while minimizing any drawbacks.

How much does an ADU cost in Florida?

The cost of an ADU in Florida, including St. Petersburg, varies based on square footage, finishes, and site complexity. A detached unit will likely have different costs than an attached garage conversion. A personalized estimate from a qualified professional is necessary for an accurate figure.

What are the rules for ADUs in Florida?

Florida has state laws encouraging ADUs, but St. Petersburg's local ordinances are the most important. These rules often cover lot size, setback requirements, and the number of ADUs allowed per property. We can help you understand the specific regulations for your St. Pete address.

Is an ADU allowed in Maryland?

This information pertains to St. Petersburg, Florida. While Maryland has its own ADU legislation, here in Florida, local St. Petersburg zoning ordinances dictate ADU permissibility. We can confirm whether an ADU is a viable option for your specific property within city limits.

What are the rules for ADU in California?

This information is for St. Petersburg, Florida. California has a unique ADU framework, but in St. Pete, you must comply with the city's specific zoning laws. These regulations address aspects such as parking requirements and maximum dwelling size. We can clarify St. Petersburg's ADU rules for you.

That particular grant is exclusive to California. For ADU projects in St. Petersburg, Florida, there are no direct state-level grants of that amount. We can discuss potential financing avenues or local incentives that might be available to help fund your ADU construction.

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

263,553residents

4,264per sq mile

—ZIP codes served

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, Crescent Lake, Historic Old Northeast, Kenwood, Beach Drive — and every surrounding area.