Are Baby Boomers Aging in Place Holding Back Needed Housing Supply?
Short Answer: Yes, boomers aging in place are holding back resale supply. That said, they're a symptom of the shortage, but not its cause. Blaming them actually lets the real culprit off the hook!
I get this question at nearly every talk I give, usually from a broker who just lost another listing appointment to a couple in their 70's who decided to "stay a few more years." and the frustration is fair. Empty-nest boomers sit on a big share of the country's family-sized homes, and they're moving far less often than their parents did.
But the way I see it is the idea that boomers are "hoarding" houses gets the economics backwards. They're actually making a perfectly rational decision given the incentives we've handed them. Think about it - those incentives are mostly ones we built: tax rules, mortgage rates, and land-use policy that never produced anywhere for them to go.
What the numbers say
Empty-nest boomers own 28% of America's homes with three or more bedrooms, while millennial parents own about 16%. (Redfin). Another 7% belong to boomer households with three or more adults, which usually means grown kids who moved back home.
The detail I find most telling: the boomer share hasn't budged in a decade.
Millennial families have gained ground, but almost all of it came from the Silent Generation passing homes on to their heirs. Boomers have not let go of anything. Here in the Seattle metro, empty-nest boomers hold 24.3% of large homes versus 17.6% for millennial families. That said, that gap is narrower than the national figure, but it's still there.
Behavior has also shifted. Cotality found that just over 22% of homeowners born in 1938 moved out between ages 65 and 75. For those born in 1946, the first boomers, it was 17%. That's roughly a one-quarter drop in mobility at the exact life stage when people have historically downsized.
Why they stay put: run the math from their side
Put yourself in the shoes of a 72-year-old couple in a four-bedroom in Bellevue or Shoreline that they bought in 1990. Here's what they're up against.
There's no mortgage to escape: 57.8% of boomer homeowners own free and clear (Redfin). When I talk about "rate lock-in," I'm usually describing younger owners with 3% loans but for most boomers the lock is different. Staying costs them property tax, insurance, and upkeep, while moving means buying back in at today's prices.
The tax code penalizes selling: The home-sale capital gains exclusion has been stuck at $250,000 single and $500,000 married since 1997. It was never indexed. I would suggest that indexing would have roughly doubled those limits, and that more than 13 million owners now have gains above the cap. On a house bought for $250,000 that's now worth $1.4 million, a couple owes tax on several hundred thousand dollars of gain the day they sell. Hold until death, and heirs get a stepped-up basis with no tax at all. We built a system that rewards staying put until the end.
Moving costs are steep: Commissions - Washington's graduated real estate excise tax, moving expenses, and furnishing a new place add up to a big check that buys them, in effect, a smaller house.
There's nowhere to go: This is the one I'd underline. Condos are about 5.3% of Washington's housing stock but have been roughly 1% or less of new construction since 2011,(Housing Development Consortium). Single-level, walkable, low-maintenance homes in the neighborhoods where these folks have friends, doctors, and grandkids barely exist.
They like it there: 78% of homeowners 60 and up said they plan to stay as they age. (National Mortgage Professional). That's not a market failure, its people get to want to stay in their homes.
Add it up and staying is the smart financial move for most of them. Any policy that relies on shaming boomers into listing is going to fail.
How much supply is really at stake?
Interestingly, it's less than the headlines imply; however, it's the wrong kind of supply for the buyers who are hurting most.
Let's start with my own back-of-envelope estimates.
Suppose boomers moved at the rate the 1938 cohort did (about 22% between 65 and 75 instead of 17%). Across 30-plus million boomer-owned homes, that five-point gap works out to be roughly 1.5 million extra homes over a decade, or about 150,000 a year.
That's real, and in tight markets it matters at the margin. However, if you set it next to a national shortage of about 4 million homes, it's clearly not the main story.
The "silver tsunami" is also coming whether we like it or not.
Just don't expect it to arrive as a wave. A Realtor.com projection released this month has boomer and Silent Generation owners releasing 13.9 million homes from 2026 to 2036. The pace rises from about 1.27 million in 2027 to 1.52 million by 2036. That's about 74% more than the roughly 8 million they released over the past decade.
Sounds great, right? But the catch is what kind of homes they'll be:
Data shows it equalling about 38,000 starter homes a year. The first-time buyer in Everett or Kent looking for a $550,000 townhouse gets almost nothing from this. The tsunami helps move-up buyers and millennial families who already have equity but it does little for the entry level, which is exactly where our shortage is worst.
Timing matters too. Much of this turnover happens through death or a move into care, not a planned downsize. Those homes come to market as estate sales, often dated, often in established neighborhoods. Cotality reports inheritances hit a record 7% of all property transfers in 2025, up from 4.1% in 2021, and some of those homes never get listed at all.
What would actually unlock those homes
If we want more boomers to sell, we have to make selling the better deal, and that starts with building them somewhere to go. Here's where I'd focus, starting with what Washington controls.
Build the downsizing product: The single biggest lever is a supply of smaller, accessible, ownable homes in the neighborhoods where older owners already live. Washington has finally started clearing the path. HB 1110 legalized middle housing in our cities, and HB 1337 opened the door to accessory dwelling units.
On condos, HB 1403 in 2025 created an insured express-warranty alternative to the implied warranty rules that have scared builders off condos for two decades. This year, HB 2304 extended that to buildings of up to four stories and 12 units, which covers the kind of single-level stacked flat a 75-year-old actually wants.\
These are good laws. Whether they work comes down to whether insurers, lenders, and builders actually use them, so watch the permit data over the next two years.
Let owners stay and add a unit: Not every boomer needs to move for us to get more housing out of their lot. A backyard cottage or a converted lower level adds a home without anyone selling. Some owners will move into the smaller unit and rent or hand the main house to family.
Fix the federal tax trap: The bipartisan More Homes on the Market Act (H.R. 1340 / S. 3332) would double the exclusion to $500,000 and $1 million and index it to inflation. As of September it hadn't had a committee markup in either chamber. I think indexing is overdue. Critics have a fair point, though: the break flows mostly to higher-wealth owners in expensive markets, it costs federal revenue, and the step-up at death would still reward holding. Raising the cap shrinks the penalty for selling; it doesn't remove the reward for staying.
What this means if you sell real estate
The bottom line: boomers aging in place are a real drag on resale inventory, but they're responding rationally to a market that gave them no good exit. The shortage we're living with was built by decades of underproduction, not by people choosing to stay in their homes.
For brokers, a few practical takeaways:
Your listing pipeline is a demographic pipeline. The release of older owners' homes accelerates every year through 2036. Build relationships with estate attorneys, financial planners, and senior move managers now. Many of those listings won't come from a planned sale.
Lead with the after-tax math. A 70-something seller isn't weighing your CMA. They're weighing the capital gains bill, the excise tax, and what a replacement home costs. Partner with a CPA and bring the full net-proceeds picture to the first meeting.
Know the new product. As middle housing and small condos start coming out of the ground under HB 1110 and the condo reforms, the broker who knows where the single-level, low-maintenance options are will win both sides of the downsizing deal.
Set expectations with first-time buyers. The silver tsunami will mostly free up three- and four-bedroom houses. Entry-level relief still depends on new construction.
So, are boomers holding back supply? A bit. But if you want more of their homes on the market, build them a place worth moving to.
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