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Why Multigenerational ADUs Are on the Rise

In the Bay Area where space is limited and real estate is at a premium, ADUs are becoming the go-to option for families who want to stay close while maintaining their own space. Whether it is a detached backyard cottage, a garage conversion, or an attached in-law suite, ADUs can be tailored for:

• Aging in place with single-level layouts, wide doorways, and accessible bathrooms
• Young adults returning home post-college
• Live-in caregivers or extended family who need proximity and privacy
• Supplemental rental income when the space is not occupied full-time

Key Design Considerations for Multigenerational ADUs

When building an ADU to accommodate multiple generations under one roof (or one property line), thoughtful design is what sets a basic unit apart from a space that truly works for everyone. From functionality to privacy, here are five crucial elements we focus on when designing a multigenerational San Jose ADU:

1. Separate Entrances for Independence and Privacy

One of the most important features of a successful multigenerational ADU is a dedicated, private entrance. This allows residents to come and go freely without disturbing others in the main home. This is especially important for adult children with busy schedules, or aging parents who may have different routines.

At May Construction, we carefully assess your property layout to design private walkways or side yard access, ensuring the ADU feels like its own independent residence. A separate entrance not only provides autonomy, but it also adds value to the home and makes the unit more appealing as a rental in the future, should your needs change.

2. Accessible Layouts for Aging in Place

Multigenerational living often involves elderly family members who may have limited mobility now or in the future. That is why our design-build process for every ADU has accessibility in mind — not just for safety today, but to future-proof the space for years of comfortable use.

This includes zero-step entries (no thresholds or stairs), wider doorways and hallways for wheelchair access, lever-style door handles, non-slip flooring, and walk-in or curbless showers with grab bar blocking installed behind the walls. These features not only promote independence for seniors but also blend seamlessly into modern design, so the space does not feel clinical or institutional.

3. Full Kitchens and Bathrooms for Autonomy

A true multigenerational ADU should feel like a home, not a guest room. That means including a fully equipped kitchen and a private bathroom, not just a kitchenette or half-bath. This gives your loved ones the ability to cook their own meals, store their groceries, and enjoy daily routines without depending on the main house.

We specialize in building compact yet highly functional kitchens with full-size appliances, thoughtful storage solutions, and finishes that match or exceed the quality of your primary home. Whether it is quartz countertops, custom cabinetry, or energy-efficient fixtures, our goal is to make the ADU feel every bit as comfortable and well-appointed as the rest of your property.

4. Soundproofing for Peace and Quiet

When two (or more) generations live on the same property, minimizing noise transfer is a major quality-of-life upgrade. Whether the ADU is attached or detached, we incorporate sound-dampening insulation, double-pane windows, and thoughtful placement of bedrooms and living areas to reduce noise between units.

For example, we may recommend using resilient channel systems in shared walls or ceilings, placing mechanical systems in sound-buffering closets, or orienting living rooms away from sleeping spaces. These strategies ensure that everyone can enjoy their own activities without constantly worrying about disturbing others.

5. Outdoor Spaces That Encourage Connection — and Privacy

Outdoor areas play a huge role in multigenerational living. A small patio or garden area can offer a private retreat for the ADU resident, while still maintaining visual and physical connection to the main house. These semi-shared zones make it easier to spend time together casually — think morning coffee or weekend barbecues — without having to be under the same roof all the time.

We often design outdoor living spaces such as pathways, seating areas, or even covered patios that provide a natural flow between the ADU and the main residence, while still giving each unit its own sense of space. Landscaping, fencing, lighting, and thoughtful orientation can all help strike that perfect balance between community and privacy.

May Construction: Your Trusted ADU and Remodeling Partner

As a leading San Jose residential contractor, May Construction has helped dozens of homeowners bring their vision of multigenerational living to life. Our services go far beyond ADUs — we also specialize in:

• Custom Kitchen Remodels
• Whole House Renovations
• Master Suite Additions
• Garage Conversions

Every project we take on is fully customized, thoughtfully designed, and built to stand the test of time. We collaborate closely with you from initial design through construction to ensure your ADU fits your family's lifestyle and enhances your property value.

Let Us Build for the Future Together

If you are ready to explore a multigenerational ADU for your San Jose home, May Construction is here to help. We understand the balance between independence and connection, and we design each space to reflect the needs of today’s modern families.

Contact us today to schedule a consultation and start building a space that truly works for everyone under your roof.