Everything homeowners ask about building an ADU in Las Vegas — answered with 2026 data.
Yes, ADUs are allowed in Residential zoning districts per Ordinance 6963 (July 2026) - the former SUP-only regime in U/R-A/R-E/R-D/R-1 no longer applies as written; confirm the updated LVMC 19.12 use tables with Las Vegas Planning in Las Vegas, NV. The maximum size for a detached ADU is 50% of the primary dwelling's floor area. Ordinance 6963 routes a DETACHED ADU to the accessory-structure standards via LVMC 19.06.040(C.8) (Tables 2 and 3), which in R-1 cap an accessory structure at half the principal dwelling — so the detached cap is tighter than the attached one, which is the opposite of what most homeowners expect. LVMC 19.12.070 also provides that in no case may the unit exceed the primary dwelling's total gross floor area.. Attached ADUs can be up to No more than the total gross floor area of the primary dwelling — "in no case shall the unit exceed the total gross floor area of the primary dwelling unit". Las Vegas has an ADU-friendliness score of 5/10. Check our full Las Vegas ADU rules page for complete zoning details.
ADU construction in Las Vegas typically costs $130,000-$250,000. The cost per square foot averages $140-$280. Garage conversions are more affordable at $60,000-$140,000, while prefab ADUs cost $90,000-$200,000. Permit fees add The old $1,030 Special Use Permit fee no longer applies to conforming ADUs under Ordinance 6963; building-permit fees are valuation-based to your budget. See our detailed Las Vegas ADU cost guide.
Detached ADUs in Las Vegas can be up to 50% of the primary dwelling's floor area. Ordinance 6963 routes a DETACHED ADU to the accessory-structure standards via LVMC 19.06.040. Attached ADUs are limited to No more than the total gross floor area of the primary dwelling — "in no case shall the unit exceed the total gross floor area of the primary dwelling unit". Junior ADUs (JADUs) have a cap of Not a defined category in Las Vegas; interior conversions with kitchens fall under Accessory Structure Class I rules. Maximum height is 2 stories or 35 feet, or the height of the principal dwelling, whichever is less — the accessory-structure standard a detached ADU inherits through LVMC 19.06.040(C.8).. You are allowed up to 1 ADU per property on a qualifying lot.
Rear setback: 3 feet minimum for detached accessory structures, plus 6-ft separation from the main dwelling; no setback required from a property line abutting an alley. Side setback: 3 feet minimum, plus 6-ft separation from the main dwelling; corner lots must match the main dwelling's street-side setback. Front setback: Detached accessory structures are not permitted in front of the primary structure. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
One additional off-street space (LVMC 19.12.070, as amended by Ord. 6963). That is the ceiling Nevada AB 396 permits a city to require.. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Pre-2026 code required owner residency to rent the unit; treatment under Ordinance 6963 is unconfirmed - verify with Las Vegas Planning. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Las Vegas is typically Confirm with Las Vegas Planning Department — the SUP hearing process adds months versus over-the-counter permits. Plan check: Confirm with City of Las Vegas Building & Safety. Pre-approved plans availability: No city pre-approved ADU plan program identified as of June 2026.
Average ADU rental income in Las Vegas: 1-bedroom units rent for $1,150-$1,450/month, 2-bedroom units for $1,400-$1,750/month. Short-term rentals: 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. Expected ROI: 5-8% annual return.
The minimum lot size for an ADU in Las Vegas is Minimum lot size removed by Ordinance 6963 (July 2026); previously a lot over 6,500 sq ft was required for the Special Use Permit. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Las Vegas, a garage conversion typically costs $60,000-$140,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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