Cost of accessory dwelling unit — St. Petersburg, FL

Looking for cost of accessory dwelling unit in St. Petersburg, FL? Call AccessoryDwellingUnit Pros 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 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 investment for an ADU depends on several moving parts, including your property’s site conditions, the complexity of your site plan, and the high-end finishes you select. Whether you are building a detached cottage or converting a garage, costs vary based on utility connections and local labor rates. Exact pricing confirmed free on the call.

Frequently asked in St. Petersburg

What are the disadvantages of ADUs?

Potential disadvantages of ADUs include the initial investment in construction and the possibility of increased utility costs. Navigating St. Petersburg's permitting process can also require time and attention to detail. However, the long-term benefits, like increased property value and rental income, often outweigh these concerns.

How much does an ADU cost in Florida?

What are the rules for ADUs in Florida?

Florida has state-level ADU guidelines, but St. Petersburg also has its own specific zoning ordinances and building codes. These often address lot size, setbacks, and density. Local professionals are well-versed in these requirements and can ensure your project complies.

Is ADU allowed in Maryland?

This service is focused on St. Petersburg, Florida. Maryland has its own set of regulations for accessory dwelling units that differ from Florida. If you need information on ADUs in Maryland, you'll need to seek out resources specific to that state and its local governments.

What are the rules for ADU in California?

California has been a leader in ADU legislation, with statewide laws designed to streamline approvals. However, local rules still apply. For homeowners in St. Petersburg, understanding St. Petersburg's specific zoning and building requirements is paramount for a successful ADU project.

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

All cities in Florida →

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, The EDGE District, Old Northeast, Gulfport, Beach Drive, Kenwood — and every surrounding area.