Multigenerational Home Design: Building for Extended Family in Central Indiana
By Michael Mercho ·
Multigenerational living is one of the fastest-growing housing trends in America, and Central Indiana is no exception. Whether you're bringing aging parents under your roof, creating a space for adult children saving for their own home, or designing for a relative with specific accessibility needs, a multigenerational custom home requires thoughtful planning that production builders simply can't deliver.
Why Multigenerational Homes Are Growing in Indiana
According to the Pew Research Center, roughly 1 in 4 American adults now lives in a multigenerational household — the highest share since the 1970s. In Central Indiana, the trend is driven by:
- Rising housing costs: Adult children staying home longer or returning after college while saving for their own home
- Aging parents: Baby Boomers aging in place rather than moving to assisted living facilities costing $5,000–$8,000/month
- Childcare economics: Grandparents providing daily childcare, which saves families $15,000–$25,000 annually
- Cultural values: Indiana's growing diversity brings families who have always lived multigenerationally
Design Principles for Multigenerational Living
Principle 1: Shared Spaces with Private Retreats
The key to multigenerational harmony is designing spaces where family members can gather comfortably — and retreat to genuine privacy when they need it. This typically means:
- A large, open-concept kitchen and great room as the shared family hub
- A separate living area (not just a bedroom) for each generation
- Separate entrances when possible, especially for in-law suites
- Soundproofing between living zones
Principle 2: Accessible Design That Doesn't Look Clinical
If you're building for aging parents, accessibility features should be integrated seamlessly — not bolted on as an afterthought:
- Zero-step entries and wide doorways (36" minimum) throughout
- A main-floor primary suite with an accessible bathroom (curbless shower, grab bars integrated into tile design, comfort-height vanities)
- Lever-style door handles and rocker light switches throughout
- An elevator shaft roughed in during framing (even if you install the elevator later, the shaft costs a fraction of retrofitting)
Principle 3: Independent Systems Where It Matters
Consider separate systems for true independence:
- A kitchenette or full second kitchen in the in-law suite
- Separate HVAC zones so each generation controls their own comfort
- Separate laundry facilities
- Independent exterior access and parking
Floor Plan Strategies
We typically see three approaches in our Hamilton County custom builds:
- Wing design: The in-law suite occupies one wing of the home, connected to shared spaces but physically separated. This works well on wider lots in Zionsville and Westfield.
- Stacked design: The in-law suite occupies the finished lower level with its own entrance, kitchenette, and outdoor access. Ideal for walkout basement lots common in Fishers and Noblesville.
- Detached ADU: A separate accessory dwelling unit connected by a breezeway or covered walkway. This provides maximum privacy but requires zoning approval — check local regulations before planning this approach.
Browse our Portfolio to see examples of multigenerational homes we've designed, or start a feasibility review to discuss your family's specific needs.
How much does it cost to add an in-law suite to a custom home in Indiana?
Adding a well-designed in-law suite to a custom home in Hamilton County typically adds $80,000–$200,000 to the construction cost, depending on size, finishes, and whether it includes a full kitchen, separate entrance, and accessible bathroom. This is significantly less expensive than separate housing or assisted living.
Do I need a special permit for a multigenerational home in Hamilton County?
Standard multigenerational designs (in-law suites within the main structure) are permitted under normal residential building permits in most Hamilton County jurisdictions. Detached accessory dwelling units (ADUs) may require additional zoning approval depending on the municipality. Check with your builder before finalizing plans.
What is the best floor plan for multigenerational living?
The best floor plan depends on your lot and family dynamics. Wing designs offer the most privacy within a single structure. Walkout basement suites are cost-effective and provide separate entrances. At Integra Builders, we design each multigenerational home around the specific family's needs rather than using a template approach.