Reno's New ADU Rules: Reduced Setbacks Open Up More Backyards

Reno homeowners can finally build backyard ADUs — and the rules keep getting friendlier. The City Council adopted Reno's first ADU ordinance on October 8, 2025, legalizing accessory dwelling units citywide in zones where single-family homes are permitted. In 2026 the city went a step further and reduced the required setbacks, opening up lots where a detached unit previously couldn't fit.

If a setback was the thing standing between your backyard and a rental unit, a guest house, or space for family — it's worth a fresh look at your lot. Here's what the ordinance allows, what changed, and the structural engineering an ADU actually needs in Reno.

What Reno's ADU Ordinance Allows

The ordinance — Reno's response to Nevada Assembly Bill 396, which directed the state's most populous jurisdictions to legalize ADUs — set the baseline rules:

• ADUs are allowed citywide in zones where single-family homes are permitted
• Lots of at least 5,000 square feet qualify
• One additional off-street parking space is required
• The ADU must be smaller and shorter than the primary residence, and sit behind it

The 2026 Update: Reduced Setbacks

As originally adopted, an ADU had to meet the same setbacks as the main house — which quietly disqualified a lot of otherwise-eligible backyards. The city's 2026 update reduced the required setbacks for ADUs, and that single change is what makes many Reno lots buildable.

The exact setback for your project depends on your zone and the unit's configuration, so confirm your parcel's numbers with the City of Reno — or send us your site plan and we'll tell you what fits.

Building Closer to the Lot Line Changes the Engineering

A smaller setback is a zoning win, but it pulls real building-code and engineering consequences into the design:

• Fire separation. Walls near a property line trigger fire-rated assemblies and limits on openings and projections — the closer you build, the more the wall construction changes.
• Foundations near the line. Excavating close to fences, neighboring structures, and utilities constrains footing design and construction sequencing.
• Drainage. Roof and site drainage has less room to work — water can't simply shed toward the neighbor.
• Snow and seismic still apply. Reno's seismic design requirements and foothill snow and wind exposure don't shrink with the setback.

None of this is a reason not to build — it's a reason to get the structural design right from day one instead of discovering these constraints at plan review.

The Engineering a Reno ADU Needs

The City of Reno requires stamped structural plans with the building permit for ADU work. A detached unit needs a complete foundation, framing, and lateral design for Reno's seismic and wind loads. Garage conversions and above-garage units need the existing structure verified for the new loads — the most common source of surprises. Our full guide covers each ADU type: ADU Structural Engineering: What Homeowners Need to Know.

We're headquartered in Reno — see what we build across our home market on the Reno structural engineering page — and we work with the City of Reno building department every week.

Reno ADU Rules — FAQ