The Financial Case for Building an ADU for Aging Parents
The cost conversation cuts in two directions. Building an ADU is not cheap. But neither is the alternative. According to the 2024 Cost of Care Survey conducted by Genworth and CareScout, assisted living community costs increased 10% to an annual national median of $70,800 per year, while the cost of a private room in a nursing home increased 9% to $127,750. Those figures are annual. They’re also trending upward every year, with inflation identified as the top driver of cost increases.
Connects viewers to the specific AARP research and advocacy referenced in the article title.
The average accessory dwelling unit costs $180,000 nationally, but most homeowners spend between $40,000 and $360,000 building their unit, at an average cost of $150 to $300 per square foot. The range is wide because so much depends on where you live, whether you build from scratch or use a prefab unit, and what accessibility features you install. A garage conversion will run far less than a new detached structure. A prefab unit on a cleared, level lot in a rural area will cost less than a custom-built unit with a foundation in a high-cost urban market.
The real-world story of Denise Martin, a 65-year-old retired financial advisor from Arizona, illustrates how this can work in practice. Martin moved into a miniature home right in her daughter’s backyard in Bend, Oregon, primarily because she wanted to be close to her grandchildren. Spindrift Homes, the tiny home company that built her unit, manufactures homes for typically under $160,000. Martin’s arrangement, reported by Fortune in February 2026, reflects a broader economic pattern: Jason Waugh, president of global real estate brokerage Coldwell Banker Affiliates, told Fortune that he’s witnessed an influx of granny pod requests as families try to make ends meet, saying multigenerational living is on the rise largely out of “economic necessity,” driven by mortgage interest rates, overall economic conditions, and a shortage of housing inventory.
There’s also a childcare dimension that often gets overlooked. With grandparents nearby, the multigenerational “granny pod” setup eases the burden of childcare costs – a welcome relief when the amount it takes to raise a child has surpassed rent in dozens of US cities, with childcare costs averaging $297,674 and reaching as high as $362,891 over 18 years, according to a 2025 analysis from LendingTree.
And the ongoing expenses inside the unit can be minimal. Martin’s utility costs run to around $35 a month in propane, according to Fortune’s reporting. That’s a very different picture from $5,900 a month for an assisted living room.