What changes between converting the garage and building a separate unit in the yard, and how local rules decide. Updated October 2026.
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Convert the garage when you want living space soon, the garage already sits where you need it and you can give up covered parking; it reuses the slab, walls and roof. Build a detached ADU when you need more room or real separation from the house and the yard can fit it within the setbacks; it costs more because it needs its own foundation, roof and utility runs. Either one is a rentable ADU only where your city or county allows ADUs.
| Garage conversion | Detached ADU | |
|---|---|---|
| Structure | Reuses the existing slab, walls and roof; the floor is leveled and insulated and the door opening is infilled | New foundation, walls and roof |
| Size | Limited to the garage footprint | Set by the local ADU size cap and the setbacks |
| Privacy | Attached to the house | Separate building |
| Parking | Covered parking is lost; some cities, counties and HOAs require replacement spaces | Garage kept; some jurisdictions require a space for a larger ADU |
| Utilities | Close to the house's panel and plumbing | Longer runs for power, water and sewer or septic |
| Planning range | $50,000 – $180,000 (one range for both today) | $50,000 – $180,000 |
| Is it an ADU? | Only with a full kitchen and where ADUs are allowed; otherwise it is living space in the house | Yes, where the jurisdiction allows ADUs |
We currently publish one planning range for ADUs and garage conversions (updated October 2026); your written estimate itemises the actual scope.
A garage conversion turns space you already have into a bedroom, an office, a family room or, with a kitchen, a small apartment. Because the slab, walls and roof stay, the work is mostly leveling and insulating the floor, infilling the garage door with a wall and windows, and running electrical, plumbing and heating and cooling. That usually makes it faster and less disruptive than building in the yard.
It suits households that can give up covered parking and want the new room close to the main house: a teenager's suite, a home office with its own door, or a parent who still wants to share the kitchen. A converted garage used as a bedroom has to meet the code for a sleeping room, including an emergency escape window or door, a smoke alarm, heating and cooling and enough ceiling height.
Watch two things. First, parking: some cities, counties and HOAs require a minimum number of off-street spaces, so a conversion can mean widening the driveway. Second, the floor: garage slabs often sit lower than the house, and if the lot is in a mapped flood zone, the floodplain administrator decides how the converted space must be built, so check the FEMA flood map for the address before design. Details on our garage conversion page.
A detached ADU gives a separate household real privacy: its own front door, no shared walls and a yard between the units. It can also be larger than most garages, up to the local cap. That makes it the better fit for a long-term rental where allowed, for a parent who wants full independence, or for keeping the garage.
It needs room on the lot. The unit must fit within the setbacks and lot-coverage limits, and several jurisdictions add their own rules; the City of Orlando, for example, does not allow a detached ADU in front of the house, and Oviedo likewise keeps ADUs out of the front of the lot. The longer utility runs and the new foundation and roof are why a detached ADU sits higher in the planning range.
Some places offer help. Unincorporated Orange County publishes pre-reviewed ADU floor plans through Ready Set Orange for homestead properties, and the City of Orlando runs an ADU Incentive Program. Check ADU rules by city for your address.
Florida lets each city and county decide whether to allow ADUs (F.S. 163.31771), so the same project can be an ADU in one town and a guest room in the next. A garage conversion without a kitchen is simply new living space in the house and needs a building permit and trade permits. With a full kitchen it becomes an ADU where the jurisdiction allows one, and their size, occupancy, lease and parking rules apply.
Parking rules vary. In Oviedo and the City of Orlando an ADU up to 500 sq ft needs no extra parking space, and one more space is needed above 500 sq ft. Unincorporated Seminole County asks for one off-street space served by the main driveway. HOA covenants can add their own requirements for the garage door elevation and parking.
Our planning range covers both: $50,000 – $180,000. The drivers are whether the unit is detached or a conversion, the utility connections, and the kitchen and bathroom. A conversion without a kitchen avoids the new foundation, roof and most of the plumbing; a detached unit with a full kitchen and bath carries all of them. Like any addition, the new space is assessed at just value for property tax (F.S. 193.155).
A detached ADU is built like a small house: a survey and site plan showing the setbacks, drawings and structural engineering, the ADU review where the jurisdiction has one, then a foundation, framing, roof, windows and doors, and new utility runs from the street or the main house for power, water and sewer or septic. Because it is a separate building, the exterior is usually designed to match the main house, which HOAs and some cities require.
The longer list of trades and the new foundation and roof are why a detached ADU takes longer than a conversion. Utility distance matters too: a unit at the back of a deep lot needs longer runs than one close to the house's panel and plumbing.
Sources (primary sources, checked 2026-10-16): F.S. 163.31771 · F.S. 193.155 · FEMA Flood Map Service Center. This page explains rules in general terms; it is not legal advice, and the building department for your address has the final word.
Call (407) 993-6889 or send your project details — we’ll get right back to you.