Interest in multigenerational living has risen as families confront high housing costs, limited inventory and the desire to share resources that can lower carbon footprints. Research also points to social benefits, such as stronger resilience in children and reduced loneliness for adults of all ages.
Families are adapting quickly.
How the Trend Is Shaping Homes
About one‑fifth of Americans now live in a household that includes more than one generation. The arrangement is often temporary, lasting around 2.5 years on average. The Harvard Joint Center for Housing Studies notes that in 2021, 10.9 million older adults lived with an adult relative of a different generation, marking an 81 percent increase since 2006.
Among people aged 65‑79, multigenerational households are more common for certain groups: 14 percent of white, 26 percent of Black, 38 percent of Hispanic, 43 percent of Asian and 23 percent of multiracial adults live with younger relatives. Realtor.com data for owner‑occupied homes show four million properties housed a parent, a child and a grandparent together in 2024, and listings for such homes attract roughly 14 percent more page views than typical listings.
Designers are responding with flexible floor plans that can accommodate changing needs. Projects range from in‑law wings attached to the main structure to freestanding accessory dwelling units (ADUs) and additions that feature private entrances. In affluent cases, family compounds with multiple single‑family houses on a single parcel are emerging.
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Design Challenges and Practical Solutions
One of the biggest hurdles is accessibility. A 2011 survey found fewer than 4 percent of homes offered the three core features of accessible design: single‑floor living, no‑step entries and wide hallways. For older adults, 16 percent of those aged 65‑79 and 37 percent of those 80 and older report ambulatory difficulties, highlighting the need for adaptable spaces.
Architects like Ryan McDaniel of Brandon Architects are planning for future elevators, coordinating with structural engineers to reserve closet space that can later become a shaft. In Fort Worth, Melanie Rosenburg of MASH Interiors added an extension that blends seamlessly with the existing house, avoiding a secondary feel.
Beyond the physical layout, legal clarity is critical. Ambiguous ownership and unclear financial responsibilities can strain family relationships. Professionals advise formalizing title, contribution schedules and exit strategies in writing before construction begins.
While larger footprints can increase property taxes, insurance premiums and utility costs, they may also reduce overall living expenses through shared resources. The net effect depends on how well families manage the added liabilities.
Designers must also consider long‑term stewardship. Multigenerational homes can serve as early inheritance vehicles, requiring conversations about who pays for repairs, who oversees daily operations and how unforeseen events—such as job loss or health crises—will be handled.
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Technology is also being woven into daily life. The FutureCare home automation system uses passive sensors to monitor routines, sleep patterns and bathroom use, sending alerts like “Mom’s morning routine is on track, kitchen visited, coffee made” to family members without relying on cameras or wearables.
One measured observation is that as families experiment with shared living, the success of each arrangement will hinge on clear communication and adaptable design. Without a solid framework for decision‑making, the benefits of reduced costs and social interaction could be outweighed by friction over responsibilities.
In the middle of the design process, architects often conduct empathy exercises. For instance, engineers at BLUM use an “Age Explorer” suit that mimics reduced mobility, limited vision and joint stiffness, providing first‑hand insight into the challenges older adults face when opening a cabinet or moving around the home.
Overall, the rise of multigenerational living reflects a blend of economic pressures and the desire for stronger family bonds. As the trend continues, the industry’s focus on flexible, accessible design and clear legal frameworks will be essential to turning shared houses into lasting, supportive homes.
