Las Vegas vs Seattle: ADU, STR & Home Business Rules Compared (2026)
Compare ADU owner-occupancy and parking rules, short-term rental licensing, and home business rules between Las Vegas, NV and Seattle, WA. Washington state law preempts several local restrictions Las Vegas still enforces.
Side-by-Side Comparison
Las Vegas vs Seattle
| Las VegasNV | SeattleWA | |
|---|---|---|
| ADUs Allowed? | Yes — permitted with a Special Use Permit (Las Vegas Unified Development Code §19.12.070) | Yes — required statewide under Washington HB 1337 (RCW 36.70A.681) |
| Owner Occupancy Required? | Conditional — the ADU may not be offered or occupied as a rental unit unless the principal dwelling is owner-occupied (Las Vegas UDC §19.12.070) | No — Washington state law bars cities from requiring owner-occupancy for an ADU (RCW 36.70A.681) |
| Parking Required? | One additional parking space beyond the number normally required (Las Vegas UDC §19.12.070) | No off-street parking required for an ADU (Seattle Municipal Code 23.42.022(I)) |
| STR Allowed? | Yes — permitted as a conditional use (Las Vegas UDC §19.12.070) | Yes — permitted in any structure established as a dwelling unit (Seattle Municipal Code 23.42.060(A)) |
| Registration Required? | Yes — a business license is required to operate (Las Vegas UDC §19.12.070) | Yes — a short-term rental operator's license is required (Seattle Municipal Code 23.42.060(C)(2)) |
| Registration Type | Business license, including payment of applicable room taxes and licensing fees (Las Vegas UDC §19.12.070) | Short-term rental operator's license (Seattle Municipal Code 23.42.060(C)(2)) |
| Home Business Allowed? | Yes — permitted with a Home Occupation Permit (Las Vegas UDC §19.16.180) | Yes — permitted outright in all zones as an accessory use (Seattle Municipal Code 23.42.050) |
| City Permit Required? | Yes — a Home Occupation Permit is required (Las Vegas UDC §19.16.180) | No — home occupations are permitted outright with no separate permit (Seattle Municipal Code 23.42.050) |
Key Differences
Las Vegas and Seattle diverge on ADU conditions largely because Washington state law directly restricts what Seattle can require. Las Vegas requires a Special Use Permit and conditions owner-occupancy on rental use — the principal dwelling must be owner-occupied before the ADU can be offered as a rental (Las Vegas Unified Development Code §19.12.070). Seattle cannot impose an owner-occupancy requirement at all, and cannot require off-street parking for the ADU, under Washington's RCW 36.70A.681 (HB 1337). Short-term rentals are permitted in both cities, but the licensing mechanics differ: Las Vegas requires a business license with room-tax compliance (UDC §19.12.070), while Seattle requires a dedicated short-term rental operator's license (Seattle Municipal Code 23.42.060). Home businesses show the clearest split — Las Vegas requires a Home Occupation Permit before operating (UDC §19.16.180), while Seattle permits home occupations outright in all zones with no separate permit, as long as the use qualifies as accessory to the residence (Seattle Municipal Code 23.42.050).
Cost Comparison
Las Vegas ADU building permit fees run roughly $500–$2,500 based on valuation, with Clark County Water Reclamation District and traffic impact fees of about $1,500–$5,000 and Clark County School District development fees of roughly $1,000–$2,500. Seattle's ADU building permit fees run roughly $1,500–$4,000, and Seattle School District #1 impact fees of approximately $3,700 per attached ADU and $7,400 per detached ADU may apply; Seattle has not codified a single all-in total. Both ranges are drawn from each city's cached fee schedule; confirm current figures with Las Vegas Building and Safety or Seattle SDCI before budgeting.
Our Verdict
Seattle offers the more permissive ADU framework thanks to Washington state preemption — no owner-occupancy requirement and no parking mandate — while Las Vegas's Special Use Permit process and conditional owner-occupancy rule add more upfront review. Both cities are STR-friendly with a license in hand, so short-term rental access isn't a major differentiator. For home-based businesses, Seattle's no-permit-required approach is simpler than Las Vegas's Home Occupation Permit requirement. Overall, Seattle's state-backed rules make it the lower-friction city for ADU builders, while Las Vegas requires more process at each step.
Explore Each City
Frequently Asked Questions
Do I have to live on the property if I build an ADU in Las Vegas?
Only if you plan to rent it. Las Vegas requires the principal dwelling to be owner-occupied before the ADU can be offered or occupied as a rental unit (Las Vegas Unified Development Code §19.12.070). Seattle has no owner-occupancy requirement at all, under Washington RCW 36.70A.681.
Which city requires more parking for an ADU, Las Vegas or Seattle?
Las Vegas requires one additional parking space beyond the normal minimum (Las Vegas UDC §19.12.070). Seattle requires none — off-street parking cannot be required for an ADU under Seattle Municipal Code 23.42.022(I).
Do I need a permit to run a home business from my house in Seattle?
No. Seattle permits home occupations outright in all zones as an accessory use, with no separate permit (Seattle Municipal Code 23.42.050). Las Vegas requires a Home Occupation Permit before operating (Las Vegas UDC §19.16.180).
Do both cities require a license to operate a short-term rental?
Yes. Las Vegas requires a business license including room-tax compliance (UDC §19.12.070), and Seattle requires a short-term rental operator's license issued by the Department of Finance and Administrative Services (Seattle Municipal Code 23.42.060(C)(2)).
Source: PropertyZoned Editorial Research. Last verified July 3, 2026.