1-Bedroom vs 2-Bedroom Granny Flat: What’s Right for You?

A granny flat adds flexible, self-contained living on the same property, keeping family close while protecting privacy. For Perth households it is a practical way to create space for grandparents, young adults or guests without leaving the neighbourhood you love.

If you're uncertain about choosing between a one-bedroom or two-bedroom granny flat, this guide assists you in comparing both options, enabling you to select what best suits your daily routine, your property and your long-term plans.

How your granny flat will be used day to day

Start with who will live in the space and how it will be used. If the primary occupant is one person who values a low maintenance home, a one-bedroom granny flat is often the right fit. If two people will live there, you have frequent visitors, or you want a study that closes off for quiet work, a two-bedroom granny flat gives extra flexibility without losing comfort.

• One bedroom granny flat benefits

  A one-bedroom granny flat keeps the footprint compact which can simplify siting and make outdoor areas feel more generous. Fewer internal walls mean a brighter open living zone, easier cleaning and straightforward furnishing. It suits a grandparent who wants independence with support nearby, a young adult saving for a deposit, or a dedicated guest retreat.

• Two-bedroom granny flat benefits

  A two-bedroom granny flat adds separation for different schedules and gives you a true spare room. It can host visiting family, double as a study or hobby space, or provide storage that keeps the living area tidy. For multigenerational households it creates privacy for couples and allows a comfortable stay for grandchildren or carers.

Key Considerations for your granny flat

When deciding between a one-bedroom or two-bedroom granny flat, there are several factors you might consider:

1. Granny flat size and the footprint of your block

   Start with size. A two bedroom granny flat will generally need more area than a one bedroom option because you are accommodating extra living space and storage. Think about where the building will sit, how it relates to the main home and how outdoor areas will be used. A compact one bedroom granny flat can free up more yard for garden or alfresco, while a two bedroom granny flat offers separation for different schedules. Choose the footprint that suits how the space will be used day to day.

2. Who will live there and for how long

   For short stays, singles or a couple, a one bedroom granny flat is comfortable and efficient. For longer stays, siblings, a parent and carer, or frequent visitors, a two bedroom granny flat gives each person a defined room so the arrangement lasts without strain.

3. Privacy, quiet and daily routines for those living in the granny flat

   If the occupants keep similar hours, a one bedroom granny flat works well, but TV, cooking and work all share the same zone and guests often use the living area to sleep. If the occupants have different bedtimes or work from home, a two bedroom granny flat lets someone close a door for sleep, study or naps, so early starts and late nights do not clash.

4. Budget, build time and approvals

   A one bedroom granny flat generally costs less to build and can be faster to deliver because it uses less material and has fewer finishes. A two bedroom granny flat costs more and may need closer attention to site coverage and setbacks, but it can attract higher rent and broader buyer interest over time.

5. Future use and value

   A one bedroom granny flat is simple to furnish and easy to repurpose as a studio, guest retreat or home office. A two bedroom granny flat gives you more options from day one, supports multigenerational living more comfortably, and can appeal to a wider range of tenants or future buyers.

Granny flat costs to consider at a high level

Overall area, specification and site conditions influence cost. A one bedroom granny flat typically uses fewer materials and trades which can help if you are working to a tighter budget. A two bedroom granny flat offers more flexibility for changing needs. A defined scope and clear inclusions help you compare like for like and avoid variations later.

A well-considered granny flat supports multigenerational living, guest stays or quiet work from home. Quality design and compliant approvals help protect long term appeal when circumstances change.

Granny flat next steps with Key Housing Group

At Key Housing Group we specialise in building high-quality one bedroom and two-bedroom granny flats across Perth with a focus on comfort, functionality and long-term reliability.

📞 Contact Key Housing Group today to start your new granny flat project today.