Can You Build an ADU on Your Property?
With new Arizona laws making Accessory Dwelling Units (ADUs) legal across more cities, homeowners are asking a key question:
Can I actually build one on my lot?
While the state has expanded your rights, local zoning still plays a role in how, where, and what type of ADU you can build.
Here’s what you need to know to figure out if your lot qualifies—and what to check before moving forward.
Step 1: Know Your Zoning
Start by confirming your property is zoned for single-family residential. Most ADU allowances under Arizona’s new law apply to these zones.
- You can usually find your zoning on your county or city’s planning department website.
- Look for terms like R-1, SF, or “Single-Family Residential.”
If you’re in a multi-family zone (like R-2), you might still be allowed to build—but rules could be different.
Step 2: Check for Minimum Lot Requirements
Some cities used to require a minimum lot size for ADUs, but under new state law, those restrictions are limited.
Still, your lot size will affect:
- How big your ADU can be
- How close it can sit to property lines (setbacks)
- Whether you can build a detached vs. attached unit
Step 3: Understand Setbacks + Placement Rules
Even though ADUs are allowed, you still have to follow basic building placement rules. These include:
- Rear and side yard setbacks (e.g., 5–10 feet from the property line)
- Distance from the main house
- Access requirements (some cities require a clear path or driveway to the ADU)
Tip: Detached ADUs often require more space, while garage conversions or attached ADUs may have more flexibility.
Step 4: Consider Existing Structures
Ask yourself:
- Do you already have a garage, workshop, or detached structure that could be converted?
- Will the ADU share utilities with your main house, or require new lines?
- Is your yard sloped, irregular, or in a flood zone?
These site conditions can affect cost, placement, and design options.
Step 5: Don’t Forget HOA Rules
Even if your city allows ADUs, your HOA may have its own restrictions. These can include:
- Prohibiting detached structures
- Requiring design approval
- Limiting rental use
Important: HOA rules don’t override state law entirely—but they can delay or complicate the process. It’s worth checking before you begin.
What If You’re Not Sure?
That’s where we come in. At PlanHAUS, we offer zoning and feasibility reviews to help you understand what’s allowed on your specific property—and how to move forward with confidence.
We evaluate:
- Your lot dimensions and zoning
- Setback and design restrictions
- Site conditions and existing utilities
- Next steps for permitting
