Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Las Vegas ADU cost →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 | The old $1,030 Special Use Permit fee no longer applies to conforming ADUs under Ordinance 6963; building-permit fees are valuation-based |
| 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 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 3 free quotes from ADU builders serving Las Vegas — no obligation.
Get Las Vegas builder quotes →Permit fees in Las Vegas are The old $1,030 Special Use Permit fee no longer applies to conforming ADUs under Ordinance 6963; building-permit fees are valuation-based. The review timeline is Confirm with Las Vegas Planning Department — the SUP hearing process adds months versus over-the-counter permits, with plan check: 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 the resale value the ADU adds, which an appraiser determines from comparable sales in Las Vegas 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 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 — Las Vegas does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000).
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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