Best ADU For · 2026
Best ADU for Multigenerational Living: Which Model Wins
For most multigenerational households, the Seven Forty-Nine is the model that wins: a 749 sq ft, 2-bedroom, 1-bath ADU priced at $347,000 with a permitting budget already built in, built in 5 to 6 months. It gives a second household enough bedrooms and enough separation to actually function as its own home, without the cost or build time of a bigger model most families don’t need yet.
The short version: For multigenerational living, the Seven Forty-Nine (749 sq ft, 2 BR / 1 BA, $347,000) hits the sweet spot of space and price for two-household living. If two full bathrooms matter more than square footage, step up to the Eight Eighty-Five 2/2 ($402,000). If a third bedroom matters most, the Nine Forty-Five 3/2 ($434,000) is the closest thing to a standalone house.
Why multigenerational living needs a different kind of ADU
Multigenerational living is not the same project as housing one aging parent or welcoming one adult child back home. It’s a full second household, often a couple, sometimes with kids of their own, sharing your property for years. That changes what the ADU has to do. It needs a real kitchen, not a kitchenette. It needs enough bedrooms that two people aren’t sharing a room who wouldn’t otherwise share one. And it needs a layout that lets someone leave for work, cook dinner, host a friend, or just close a door, without walking through the middle of anyone else’s evening.
The mistake we see most often is buying too small. A studio or a one-bedroom ADU is a great fit for a single person, but it puts real strain on a couple or a parent-and-child household trying to live full time in one room. A true multigenerational ADU needs at least two bedrooms so a couple keeps their own space, plus a second room for a child, a guest, or a home office.
The opposite mistake is buying more house than the household needs. A 1,200 sq ft, 3-bedroom, 2-bath home is the right call for a full family with kids, but it costs more and takes longer to build than a couple or a small household actually requires. Matching the model to who is really moving in, on day one, keeps the project on budget without giving up independence. Browse the full model lineup or run your own numbers in the ADU cost calculator.
The models that fit
| Model | Size | Beds/Baths | All-inclusive price* | Why it fits |
|---|---|---|---|---|
| Seven Forty-Nine | 749 sq ft | 2 BR / 1 BA | $347,000 | Two-household living with real privacy, our top pick |
| Eight Eighty-Five 2BR | 885 sq ft | 2 BR / 1 BA | $377,000 | Built specifically for multigenerational households, more room to spread out |
| Eight Eighty-Five 2/2 | 885 sq ft | 2 BR / 2 BA | $402,000 | Two full bathrooms for true independence between two adults |
| Nine Forty-Five 3/2 | 945 sq ft | 3 BR / 2 BA | $434,000 | A full family with kids, the closest thing to a standalone house |
*Includes a permitting budget, not final permit costs. Permits and property-specific site work (septic, retaining walls, etc.) vary by property and are confirmed in your feasibility study.
Why the Seven Forty-Nine wins for most families
The Seven Forty-Nine is our l-shaped 749 sq ft model, and it’s built for exactly this situation: two households sharing a property who both want a complete home, not a compromise. At 2 bedrooms and 1 bath, it gives a couple their own bedroom, a second bedroom for a child, guest, or office, and a full kitchen and living space that doesn’t feel like an addition tacked onto the main house.
What tips it in favor of the Seven Forty-Nine over the larger l-shaped models is the combination of price and timeline. At $347,000, permitting budget included, it comes in well under the 885 and 945 sq ft options, and its 5 to 6 month build time is faster than anything above it in the lineup. For a couple, a small family, or parents who want their own full home on your property, that’s real space and real privacy without paying for square footage that would sit mostly empty.
That price already includes a permitting budget, plans, foundation, the factory build (built roughly 97% off-site in our Salinas factory), delivery, utility hookups, appliances, and final inspection, so $347,000 is a real number to budget against, not just a starting point. Your exact permit costs are set by your city and county and get confirmed during your feasibility study.
When to step up: two bathrooms or a third bedroom
Two situations call for something bigger than the Seven Forty-Nine. The first is when two adults sharing the ADU each want their own bathroom, which is common when the second household is two unrelated adults, a couple with a live-in parent, or anyone prioritizing full independence over a smaller footprint. The Eight Eighty-Five 2/2 solves that directly: same 885 sq ft, 2 bedrooms, but 2 full baths instead of 1, for $402,000 and a 6-month build.
The second situation is a full family with kids moving in as the second household. That’s where the Nine Forty-Five 3/2 makes more sense than either Eight Eighty-Five: 945 sq ft, 3 bedrooms, 2 baths, $434,000, also a 6-month build. It’s the model that comes closest to feeling like a standalone house rather than an ADU, which matters when there’s more than one generation living inside the second household itself.
If you’re weighing 2 bedrooms against 3, or 1 bathroom against 2, the honest test is simple: count exactly who is moving in and whether any two of them would otherwise share a bedroom or a bathroom full time. That answer usually points straight to the right model.
Pricing, financing, and next steps
Every price above already has a permitting budget built in, along with plans, foundation, the factory build, delivery, utility hookups, appliances, and final inspection, so there’s no per-square-foot math to do. Final permit costs are set by your city and county and get confirmed during your feasibility study, and property-specific site work such as septic upgrades or retaining walls sits outside the listed model price, though we handle it in-house under your contract so the project stays with one builder. Start with the ADU cost calculator to see how a model fits your budget, then confirm your lot can support it with a feasibility study. For a full breakdown of what drives price up or down across the lineup, see our general ADU pricing guide or the full pricing page.
Frequently asked questions
What size ADU is best for multigenerational living?
For most multigenerational households, 749 to 945 sq ft is the right range. The Seven Forty-Nine (749 sq ft, 2 BR / 1 BA, $347,000) fits a couple or small household well. Families with kids or households wanting a third bedroom typically move up to the Nine Forty-Five 3/2 (945 sq ft, 3 BR / 2 BA, $434,000).
Is the Seven Forty-Nine big enough for two adults living full time?
Yes. At 749 sq ft with 2 bedrooms and a full kitchen, it’s built as a complete standalone home, not an add-on room. It works well for a couple, or for one adult plus a child, guest, or home office in the second bedroom.
Do we need two bathrooms for a multigenerational ADU?
Only if two adults are sharing the home and want full independence from each other, not just from the main house. If that’s the case, the Eight Eighty-Five 2/2 (885 sq ft, 2 BR / 2 BA, $402,000) adds a second full bathroom over the standard Eight Eighty-Five 2BR (2 BR / 1 BA, $377,000).
How long does it take to build a multigenerational ADU?
The Seven Forty-Nine builds in 5 to 6 months. The Eight Eighty-Five models (both the 2BR and 2/2) and the Nine Forty-Five 3/2 build in 6 months. Because roughly 97% of the home is built in our Salinas factory before it’s crane-delivered to your property, weather and site delays have far less impact on the timeline than with a site-built addition.
Can a multigenerational ADU generate rental income later?
Yes. Any of these models can shift to a rental once the family no longer needs it as a second household, since each one is a complete home with its own kitchen, bathroom, and entrance. See how much rent an ADU can earn in California for what that looks like by size.
Ready to see which model fits your lot and your family? Start with a feasibility study or browse the full model lineup.