Accessory Dwelling Units — ADUs, granny flats, in-law suites, backyard cottages, whatever you want to call them — have gone from niche to mainstream in Central Florida faster than most people realize. Orange County now has a dedicated program to make building one easier, and the interest has been significant. If you’re a homeowner thinking about adding one to your property, or a buyer specifically looking for a home with ADU potential, this post covers what you need to know right now.
This is also a topic that comes up with investors. An ADU adds a rentable unit to a property without subdividing the lot, which changes the math on a lot of deals if you think through it correctly.
An ADU is a self-contained residential unit — kitchen, bathroom, sleeping area — built on the same lot as a single-family home. It can be attached to the main house, a converted garage or interior space, or a completely separate structure in the backyard.
ADUs are used for a few distinct purposes: housing aging parents or adult children who need proximity but not full cohabitation, generating long-term rental income, providing a space for a caregiver, or simply adding flexibility to a property. What they’re generally not used for in Orange County is short-term rental — more on that below.
Orange County launched Ready Set Orange in August 2024 as part of its Housing for All initiative. The program was specifically designed to remove the barriers that were stopping homeowners from moving forward with ADU projects — mainly the complexity and cost of the permitting process.
The program offers four pre-designed ADU floor plans, each pre-reviewed by the county’s building division for Florida Building Code compliance. The plans are free to use and range in size from 531 to 708 square feet. They come with citrus-themed names:
1 bed / 1 bath
Single level
1 bed / 1 bath
Single level
1 bed / 1 bath
Dual entry
1 bed / 1 bath
Two story
By using a pre-approved plan, homeowners can skip several early steps in the permitting process and reduce both time and cost. The Clementine is reportedly the most popular plan due to its layout and functionality.
The program applies to unincorporated Orange County properties where the homeowner’s primary residence is homesteaded on the same lot. By mid-March 2025, over 323 applications had been submitted with 122 advancing into active construction planning — a significant level of uptake for a program that had only been running for seven months.
Orange County has allowed ADUs on residentially zoned properties since 2019. The key standards under current code:
| Requirement | Standard |
| Maximum size | 50% of the primary dwelling’s living area or 1,000 sq ft, whichever is less |
| Rear setback (1-story) | Minimum 5 feet from rear property line |
| Rear setback (2-story) | Minimum 15 feet from rear property line |
| Side setbacks | Same as principal structure for the zoning district |
| Separate entrance | Required |
| Short-term rental | Not permitted — rental must be longer than 180 days |
For the full development standards, refer to Orange County Code Section 38-1426. Your lot dimensions, existing structure size, and zoning district all factor into what’s actually buildable on your specific property.
Properties within the incorporated City of Orlando are governed by different standards than unincorporated Orange County. The City’s development standards for ADUs include a 750 square foot maximum size, separate entrance requirements, and specific setback and parking rules that vary by zoning district.
The City of Orlando also has a permit tool on its website that helps homeowners determine which permits are required for their specific ADU project based on property address and project type.
This is the question I get asked most often when ADUs come up, especially from investors. The honest answer for Orange County unincorporated: ADUs cannot be used for short-term rentals (less than 180 days). This includes Airbnb and VRBO. Rental must be longer than 180 days to comply with current county regulations.
This doesn’t mean ADUs aren’t valuable as an investment play — long-term rental income on a separate unit attached to your primary residence is still a meaningful financial benefit. It just means the short-term vacation rental angle doesn’t work here without running into compliance issues. If short-term rental is your primary objective, you need to be looking at properties in the right zoning districts and municipalities for that, which is a different conversation.
If you’re buying a home with the intention of adding an ADU, there are things to verify before you make an offer. Lot size and configuration matter — you need enough usable rear yard to meet setback requirements and still have a buildable footprint. Zoning district matters. Existing structure size matters because the ADU can’t exceed 50% of the primary home’s living area in Orange County.
If ADU potential is part of why a property interests you, tell me upfront. I can help you evaluate whether the lot and zoning actually support what you have in mind before you get under contract on something that won’t work.
Thinking about adding an ADU to your property or buying something with ADU potential in Orange County? Reach out and we can work through whether it makes sense for your situation.
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