I've been building ADUs for 30 years. I've also been a real estate investor for 12. So when clients ask me about ROI, I'm not just giving a contractor's answer — I'm giving you the investor's answer too.
The bottom line: in Santa Cruz and Monterey Counties, a well-built ADU is one of the best investments you can make. Here's the math.
Studio or 1BR ADU rental range in Watsonville, Seaside, Marina
1BR ADU rental range in Santa Cruz, Capitola, Monterey
2BR ADU rental range across the service area
| ADU Type | All-In Cost | Monthly Rent | Payback |
|---|---|---|---|
| Garage Conversion | $150,000 | $2,000 | 6.3 years |
| Detached 1BR | $210,000 | $2,400 | 7.3 years |
| Detached 2BR | $260,000 | $3,200 | 6.8 years |
| Two-Story ADU | $290,000 | $3,600 | 6.7 years |
Beyond rental income, a permitted ADU adds significant value to your property. In our market, appraisers typically value an ADU at 100–120x monthly rent. So a unit renting for $2,500/month adds $250,000–$300,000 in appraised property value.
That means on a $250,000 ADU that rents for $2,800/month, you've added $280,000–$336,000 in property value. You're in the money before the first tenant moves in.
Peninsula Construction offers financing up to $100,000 included with every estimate. Many clients also use:
💡 Investor's Take: I've been doing real estate for 12 years. An ADU in this market is one of the few investments where you get rental income AND property appreciation AND you're improving an asset you already own. The numbers work. The question is execution — and that's where we come in.
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