Assisted Living vs. an ADU: The Real Cost Comparison
Carlos Moreno, Assoc. AIA
Founder, KĒĒP
Published August 18, 2026 · Updated August 24, 2026 · 6 min read
The short answer
Assisted living in California averages about $6,400 a month, per Genworth's Cost of Care Survey — roughly $77,000 a year, rising with care needs. An estimated loan payment on a studio ADU is around $1,461 a month. The ADU costs far less per month, keeps a parent thirty steps away instead of across town, and leaves the family owning an asset.
Running the five-year math
The comparison that changes minds is cumulative. Facility fees leave the family every month and buy nothing anyone keeps. An ADU loan payment builds equity in a permanent home on land the family already owns.
| Assisted living facility | KÄ’Ä’P ADU on your property | |
|---|---|---|
| Monthly cost | ~$6,400 average | ~$1,461 est. loan payment |
| Five-year total | ~$384,000 spent | Loan paid down on an owned asset |
| Distance from family | A scheduled visit away | Thirty steps from your door |
| What you own at the end | Nothing | A permanent home on your land |
Loan estimates assume financing the full build cost at roughly 8.5% over 30 years — verify with a lender. Equity gained is the increase in your property's value, typically less than the full build cost.
See how the numbers work for your family.
Run a free feasibilityIt isn't only about money
The financial case is strong, but most families tell us the deciding factor is proximity. A parent in a purpose-built unit in the backyard keeps their independence and dignity — their own front door, kitchen, and routine — while the people who love them are a few steps away, not a drive across town.
An aging-in-place ADU is designed for this from the studs out: no thresholds to trip on, doorways sized for a wheelchair or walker, blocking in the walls for future grab bars, and everything on one level. It is a home built to hold a life, not a room rented by the month.
This article is general information, not financial or medical advice. Consult professionals for your family's specific situation.
Common questions
In most cases, yes, on a monthly basis. Assisted living in California averages about $6,400 a month per Genworth's Cost of Care Survey. An estimated loan payment on a studio ADU is around $1,461 a month, and the family owns the asset at the end.