Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Building an ADU in Las Vegas costs between $130,000-$250,000 for new construction, with per-square-foot costs averaging $140-$280. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $60,000-$140,000, while prefab/modular ADUs fall in between at $90,000-$200,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Special Use Permit reported at $1,030 ($500 application + $500 notification + $30 recording, per Las Vegas Review-Journal) plus valuation-based building permit fees — confirm current fee schedule with the city |
| Impact Fees | Confirm with City of Las Vegas Building & Safety |
| 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 |
Permit fees in Las Vegas are Special Use Permit reported at $1,030 ($500 application + $500 notification + $30 recording, per Las Vegas Review-Journal) plus valuation-based building permit fees — confirm current fee schedule with the city. The review timeline is Confirm with Las Vegas Planning Department — the SUP hearing process adds months versus over-the-counter permits, with plan check taking approximately Confirm with City of Las Vegas Building & Safety. Impact fees are Confirm with City of Las Vegas Building & Safety. Pre-approved plans: No city pre-approved ADU plan program identified as of June 2026.
| 1-Bedroom Rent | $1,150-$1,450/month |
| 2-Bedroom Rent | $1,400-$1,750/month |
| Annual Rental Income (est.) | $15,600/year |
| Payback Period (est.) | 12.2 years |
| Short-Term Rental | No — accessory dwelling rental agreements must exceed 30 days (per Review-Journal reporting on area jurisdictions), and the city's separate short-term rental licensing regime applies |
| Overall ROI Estimate | 5-8% annual return |
A typical ADU in Las Vegas generates approximately $15,600 per year in rental income based on average 1-bedroom rents. At an average construction cost of $190,000, the estimated payback period is 12.2 years — before accounting for property value appreciation, which typically adds 20-35% to home value.
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Las Vegas: $60,000-$140,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $90,000-$200,000.
3. Pre-approved plans (No city pre-approved ADU plan program identified as of June 2026) can save $3,000-$10,000 in design costs and 2-3 months in review time.
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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