ADUs — accessory dwelling units, sometimes called in-law suites or backyard cottages — are one of the strongest ROI moves a Florida homeowner can make right now. They add square footage, generate rental income, and house family. But the path from "I want one" to "it's built" runs through Florida's permitting system, and the numbers vary widely by jurisdiction.

What Counts as an ADU in Florida

In Florida, an ADU is a secondary dwelling on the same lot as a primary residence. It has its own kitchen, bathroom, and sleeping area. ADUs come in three forms — detached cottages, attached additions sharing a wall with the main home, and converted spaces (a garage conversion or finished basement).

Florida doesn't have a single statewide ADU law. Whether you can build one — and how big it can be — depends on your city or county zoning code. Orlando, Orange County, Winter Park, and Lake Nona each have their own rules.

Typical ADU Cost in the Orlando Metro

For a turnkey ADU in 2026 dollars, expect these ranges in the Orlando area.

  • Garage conversion (insulation, drywall, kitchenette, full bath): $60,000–$120,000
  • Attached addition (400–600 sf, sharing a wall with the main home): $120,000–$220,000
  • Detached cottage (500–800 sf, new foundation): $180,000–$320,000+

Custom finishes, premium kitchens, and longer utility runs (when the closest sewer connection is far from the build site) can push these higher. A lot also depends on whether you need a new septic system or can tie into existing utilities.

Permits and Approvals

Every ADU in the Orlando metro requires a building permit and zoning verification. Depending on your jurisdiction, you may also need stormwater review, septic / well permits, and HOA approval. Permit and impact fees alone can add $5,000–$15,000 to the project.

Plan on 8–16 weeks for the permit process before construction starts. We handle this paperwork as part of every ADU project — homeowners shouldn't have to navigate Orange County's permit office on their own.

ROI: What an ADU Actually Returns

ADU ROI in the Orlando market comes from three sources.

  • Rental income: A 600 sf detached ADU rents for $1,500–$2,200/month long-term in most Orlando neighborhoods, more for furnished short-term rentals where local rules allow it.
  • Property value: ADUs typically add 20–30% of their build cost back to the home's appraised value — modest, but meaningful for refinances.
  • Family use: Aging parents, adult children, or remote-work studios that would otherwise require a move or a separate property.

Pure cash-flow ROI on a $200,000 ADU rented at $1,800/month works out to roughly 8–10% gross yield before taxes and maintenance — comparable to other Orlando rental investments, with the convenience of the unit being on your own property.

What to Ask Before You Build

Before signing a contract, get clear answers on these five questions.

  • Does my zoning allow a detached ADU on this lot, or only attached / converted?
  • What's the maximum allowed square footage and height in my zoning district?
  • Will I need a new septic / sewer connection, or can we tie into existing utilities?
  • How long will permitting take in my jurisdiction?
  • What's the estimated total — including permits, impact fees, utility extensions, and finishes — not just the construction line item?

Thinking About an ADU on Your Orlando Property?

Renovate Services Co. handles ADU projects across the Orlando metro — design coordination, permits, foundation, framing, finish work, and final inspection. Free in-home consultation and written scope.

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