Granny Flat Cost
Building a granny flat in Brisbane typically costs between $180,000 and $380,000, depending on size, design complexity, and site conditions. At Mamet Homes, we provide comprehensive fixed-price quotes that eliminate budget blowouts and unexpected variations.
Building a granny flat should be an exciting investment in your family’s future and your property’s value, not a source of financial stress and sleepless nights. Too many Brisbane homeowners delay their granny flat dreams for months or even years because they’ve heard nightmare stories about projects that start at one price and end up costing 30-50% more due to endless variations, surprise expenses, and builders who seem to discover new “essential” work every week.
At Mamet Homes, we believe you deserve complete cost certainty from day one. Our comprehensive fixed-price approach means you’ll know exactly what your granny flat will cost before construction begins, with no hidden fees, no surprise variations, and no budget anxiety. This transparency allows you to focus on the exciting aspects of creating additional living space and rental income.
Building a granny flat in Brisbane typically costs between $180,000 and $380,000, depending on size, design complexity, and site conditions. Understanding this investment range helps you plan effectively while maximising your return through rental income and property value increases.
Follow our guide below to work out what type of granny flat works best for your needs.
Entry-level granny flats
Perfect for first-time builders or investment-focused projects, these 40-50m² granny flats include all essentials for comfortable living. You’ll get a quality one-bedroom configuration with basic kitchen, standard bathroom fixtures, and reliable finishes that attract solid rental returns of $400-480 per week.
The entry-level package includes laminate flooring, weatherboard cladding, basic electrical and plumbing, plus all council approvals and utility connections. While simple in specification, these granny flats are built to the same structural standards as our premium builds, backed by our 10-year warranty.
Mid-Range Granny Flats
Our most popular option balances quality with value, offering 50-65m² of well-designed space. These builds typically feature one to two bedrooms with enhanced finishes that appeal to quality tenants and generate $480-580 per week in rental income.
Mid-range specifications include stone benchtops, premium bathroom fittings, hybrid flooring, and modern cladding options. You’ll also enjoy ducted air conditioning and quality internal finishes that create comfortable year-round living. This price point delivers excellent investment returns while providing a space your family would genuinely enjoy living in.
Premium Granny Flats
For those seeking maximum value addition and rental returns, premium granny flats offer 65-80m² of beautifully designed space. These builds feature two bedrooms, luxury bathrooms, and designer kitchens that command top rental rates of $580-650+ per week.
Premium builds include engineered timber flooring, architectural cladding materials, smart home features, and thoughtfully landscaped outdoor areas. The investment in quality finishes typically adds 25-30% to your property value while attracting long-term tenants who treat the property with respect.
Granny Flat Educational Videos
Our comprehensive video library covers everything from initial planning to final handover. Learn from Adrien’s 20+ years of experience through our “9 Steps to Guarantee Your Building Success” series and expert insights on maximising your granny flat investment.
Ready to take the first step? Contact us today for a free consultation and discover how Petite by Mamet can turn your dream into reality.