Why multigenerational living is becoming a smart property investment strategy
As more Australian households consolidate across generations, investors are finding new opportunities to lift yields, reduce vacancy risk and future-proof their portfolios through flexible housing design.
Multigenerational living refers to a housing arrangement in which two or more adult generations, such as parents and adult children, grandparents, extended relatives or a combination of these, live together in the same home while maintaining varying levels of independence.
The number of multigenerational households increased by around 22 per cent between 2016 and 2021 to approximately 335,000, with industry estimates suggesting that around one in five Australians now lives in a multigenerational home.
Families are consolidating housing, care and financial arrangements, reshaping demand for properties that can support multiple households under one roof.
Rising living costs and limited housing supply are key drivers.
More than half of men and nearly half of women aged 18–29 now remain in the family home for longer, while ageing relatives increasingly prefer informal support networks rather than entering formal care.
With vacancy rates near record lows and diverse family formations projected to accelerate over the coming decades, investors are reassessing how adaptable housing can capture this shift.
For investors, the next consideration is how to translate this shift into practical opportunities within the existing property.
Unlocking greater value from existing land
One of the strongest advantages of configuring a property for multigenerational living is the ability to increase rental income without subdividing or undertaking major redevelopment.
Dual-key layouts, secondary dwellings and flexible floor plans can generate two income streams from a single parcel of land.
Secondary dwellings, such as compliant granny flats or self-contained studios, have proven particularly effective. Typical build costs of $100,000 to $200,000 combined with achievable rents of $400 to $500 per week often result in double-digit gross yields for the secondary dwelling alone.
Research by InvestorKit shows that adding a granny flat can increase a property’s overall rental yield by 1.4 to 1.65 percentage points compared to similar homes without one. In a rental market where vacancy rates sit between 1–1.2 per cent, this increase strengthens cash flow and supports income continuity.
Converting existing homes with strategic upgrades
Upgrading existing homes is often the most cost-efficient way to meet multigenerational demand. Common improvements include:
- creating a private living area with a bedroom and bathroom
- adding a kitchenette or reconfiguring underused spaces
- enhancing sound separation to maintain privacy
- improving circulation to support independent living within the home.
Some owners add a secondary dwelling above the garage.
Internal links can be retained so the property shifts seamlessly between single-household and dual-living as family needs evolve. This adaptability enhances long-term value and broadens buyer appeal among investors, extended families and downsizers seeking additional income.
Upgrades of this kind sit within clear planning and regulatory frameworks that vary not only between states but also between individual councils, with key considerations including differing size limits (up to 60sqm in New South Wales and 80sqm in Queensland), council controls governing setbacks, site coverage, private open space and parking.
Victorian councils restrict dependent person’s units to family use only while NSW and Queensland allow rental to any tenant.
Because these requirements differ across jurisdictions, early engagement with designers, certifiers and planners helps avoid non-compliant layouts and minimises risks at leasing, refinancing or sale.
Flexibility that supports stronger capital growth
Homes configured for multigenerational living attract broader buyer interest because they suit diverse life stages and household structures. Private entrances, multiple living areas and extra bathrooms appeal to extended families, downsizers and investors seeking dual-occupancy potential.
Where rental demand is strong and planning conditions are favourable, properties with compliant secondary dwellings have shown capital performance in line with broader market growth, in addition to outperforming on rental income.
Flexibility and consistent rental demand help preserve value during slower cycles and support stronger competition at sale.
While financial benefits are clear, investors must account for costs associated with constructing or upgrading secondary dwellings, which include:
- design, approvals and site investigations
- utility connections
- construction and fit-out
- ongoing maintenance and potentially higher insurance.
Multigenerational properties also typically experience lower tenant turnover due to schooling, work patterns and family care arrangements. While this stability reduces vacancy risk, it increases use of shared infrastructure, meaning investors should allow for higher maintenance and review insurance coverage to ensure it accurately reflects the dwelling’s intensified use.
Depreciation benefits for multigenerational upgrades
Investors who upgrade a home to accommodate rent-paying family members or create a defined rental area can access meaningful tax depreciation deductions.
Structural works can be claimed as capital works deductions, while new appliances and other removable assets within income-producing areas can be depreciated as plant and equipment.
A site inspection and a depreciation schedule prepared by a qualified quantity surveyor ensures all assets are correctly identified, classified and apportioned between personal and rental use.
Whether through secondary dwellings or strategic upgrades, designing for multigenerational living positions investors to secure resilient income and long-term capital growth.
