ADU & Casita Construction
Arizona's Fastest-Growing Build Category
Rental income, multigenerational living, or guest quarters — we've built dozens of ADUs across Maricopa County and know every city's permit process cold.
Arizona ADU Experts
Arizona HB 2928 significantly expanded ADU rights statewide — making it easier than ever to add a second unit to your property. Echelon Valley has built ADUs in nearly every Phoenix-metro city, and we know every jurisdiction's permitting nuances cold.
We handle the entire process: site feasibility, design coordination, permitting, construction, and utility connections. Most detached ADUs in the Valley complete in 12–18 weeks from permit approval.
Types of ADUs We Build
Detached Casita
A fully independent unit in your backyard. Separate entrance, full kitchen, bedroom, bath. 400–800 sqft. Most popular for rental income or multigenerational use.
Attached ADU
Connected to the main home via shared wall. Less expensive than detached, shares some utilities. Ideal for multigenerational living with privacy.
Garage Conversion
Convert an existing attached or detached garage into a livable ADU. Often the most cost-effective option — structure already exists.
Junior ADU (JADU)
Created within the existing footprint of the primary home. Lower cost, minimal permitting. Great starter option before committing to a detached build.
The ADU ROI in Phoenix
Phoenix rental rates remain among the highest in the Southwest. A 600 sqft casita renting at $1,400/month generates $16,800/year — often covering the full construction cost within 8–10 years, while permanently adding value to your primary property.
| ADU Type | Build Cost Range | Est. Monthly Rent |
|---|---|---|
| 400 sqft Studio Casita | $75K – $120K | $1,100 – $1,500 |
| 600 sqft 1BR Casita | $110K – $168K | $1,400 – $1,900 |
| 800 sqft 2BR Casita | $150K – $230K | $1,800 – $2,400 |
| Garage Conversion | $45K – $90K | $900 – $1,400 |
Frequently Asked Questions
How long does a detached ADU take to complete in the Valley?
Most detached ADUs complete in 12 to 18 weeks from permit approval.
What types of ADUs does Echelon Valley build?
Detached casitas, attached ADUs, garage conversions, and junior ADUs (JADUs), ranging from 400 to 800 square feet for detached units.
Did Arizona law recently expand ADU rights?
Yes. Arizona HB 2928 significantly expanded ADU rights statewide, making it easier to add a second unit to a property.
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