Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Orlando ADU cost →Building an ADU in Orlando costs between $150,000-$260,000 for new construction, with per-square-foot costs averaging $200-$260. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $40,000-$80,000, while prefab/modular ADUs fall in between at $90,000-$200,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Building permit: $64.94 for the first $1,000 of construction cost plus $4.32 per additional $1,000, plus about 10% in surcharges (fee schedule eff. Jan 2023); the city says ADU building-permit fees typically total $450-$1,050. Electrical, plumbing and mechanical permits are extra. |
| Impact Fees | $1,300-$3,100 typical (city estimate, Feb 2026). Sewer benefit fee $1,319.50 flat; transportation and parks fees only if house plus ADU crosses a size tier (e.g. $1,424 transportation for 1,800 + 500 sq ft); school impact fee exempt (Orange County Ord. 2020-35). |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Orlando, where we have them — free, no obligation.
Get Orlando builder quotes →Permit fees in Orlando are Building permit: $64.94 for the first $1,000 of construction cost plus $4.32 per additional $1,000, plus about 10% in surcharges (fee schedule eff. Jan 2023); the city says ADU building-permit fees typically total $450-$1,050. Electrical, plumbing and mechanical permits are extra.. The review timeline is The city does not publish a fixed review time for ADU permits; check status in the Permitting Services portal. Budget extra time for Appearance Review, which must be approved before building permits (Sec. 58.501(D))., with plan check: Not published; ask Permitting Services (407.246.2271). Allow for pre-screen, routing and review of each trade permit.. Impact fees are $1,300-$3,100 typical (city estimate, Feb 2026). Sewer benefit fee $1,319.50 flat; transportation and parks fees only if house plus ADU crosses a size tier (e.g. $1,424 transportation for 1,800 + 500 sq ft); school impact fee exempt (Orange County Ord. 2020-35).. Pre-approved plans: None yet. The city plans a library of pre-reviewed 'prepackaged' ADU plans sold at a fixed price by the designing firm, expected fall/winter 2026..
| 1-Bedroom Rent | $1,400-$2,050/month |
| 2-Bedroom Rent | $1,600-$2,400/month |
| Annual Rental Income (est.) | $20,700/year |
| Payback Period (est.) | 9.9 years |
| Short-Term Rental | Restricted: stays under 30 days need city home-share registration and are not allowed in every situation (orlando.gov/homeshare); a standard long-term lease is allowed |
| Overall ROI Estimate | 7-9% annual return |
A typical ADU in Orlando generates approximately $20,700 per year in rental income based on average 1-bedroom rents. At an average construction cost of $205,000, the estimated payback period is 9.9 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Orlando and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Orlando: $40,000-$80,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $90,000-$200,000.
3. Pre-approved plans — Orlando does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000). See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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