Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in St. Petersburg, FL? Call AccessoryDwellingUnit Experts 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 is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

The cost to build an ADU varies based on whether you are converting an existing garage or building a new detached structure from the ground up. Factors like foundation work, utility extensions, high-end finishes, and site access all influence the final total. Exact pricing confirmed free on the call.

Frequently asked in St. Petersburg

What are the disadvantages of ADUs?

How much does an ADU cost in Florida?

What are the rules for ADUs in Florida?

Florida has a statewide ADU law that encourages their development, but local jurisdictions like St. Petersburg may have specific regulations. These often cover things like minimum unit size, owner occupancy, and parking. We can help you navigate these rules. Call for advice.

Is an ADU allowed in Maryland?

This question pertains to a different state. Our services are focused on ADU construction in Florida, including St. Petersburg. If you're looking to add an ADU in this area, we can provide you with the most relevant and accurate information. Let's discuss your local project.

What are the rules for ADU in California?

California's ADU laws are distinct and do not apply to St. Petersburg. Each state and city has its own set of regulations regarding Accessory Dwelling Units. For the most accurate information on building an ADU here, it's best to consult with local experts. We can facilitate that.

That specific grant is a California initiative and not available in Florida. While there aren't widespread grants of that nature currently for ADUs in Florida, the financial benefits of an ADU through rental income and increased property value are substantial. Let's explore how an ADU can work for you.

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, Kenwood, Old Northeast, The Edge District, Tyrone, Gulfport — and every surrounding area.