Duplex
Builder Sydney
confidence
Duplex Home Builders For
Sydney
Whether you’re planning a dual-occupancy property for extended family, a rental investment, or future resale potential, a duplex house from Firmus Building could be the solution. Our experts help you make the most of your block, whether it’s a custom new build or a home renovation.
At Firmus Building, we work closely with you to create high-quality duplex homes that balance thoughtful design with everyday functionality. Every duplex we build is tailored to your needs, from the layout and flow to the finishes that reflect your personal style. When you partner with us, you’re not just getting the experience of a second-generation family builder – you’re getting a team who’ll be by your side from the start. We manage everything from design to handover so you can spend less time stressing and more time enjoying the building journey.
Duplex Home Designs Made
Simple
We set your project on the right path from day one with our early engagement service. After we take some time to understand your goals and review your site, we’ll develop a project mood board to help you visualise the end result.
We’ll guide you through selected showrooms so you can see and feel the finishes, fixtures, and fittings in person. Our builder will be by your side every step of the way, offering advice and over 30 years of expertise to help you design the best duplex to suit your goals.
All the effort we put in during the early stages helps your project stay on track, meaning fewer delays and a smoother execution.
A Duplex Builder Who Makes the Best Use of Your Land
Building a duplex isn’t just about splitting a block in the most economical way possible. It’s about tailoring the design to suit your lifestyle needs now and into the future. You need a partner who works with you to understand your goals rather than just doing what’s worked in the past.
As a Sydney duplex builder, Firmus Building knows how to take advantage of high-value blocks and create a space that feels uniquely yours. All our projects are director-run by second-generation builders who take pride in turning blank canvases into homes that make the most of your investment.
Building isn’t just a job for us – it’s a labour of love, and we’re ready to get started.
Frequently Asked Questions
Why build a duplex in Sydney?
We set your project on the right path from day one with our early engagement service. After we take some time to understand your goals and review your site, we’ll develop a project mood board to help you visualise the end result.
We’ll guide you through selected showrooms so you can see and feel the finishes, fixtures, and fittings in person. Our builder will be by your side every step of the way, offering advice and over 30 years of expertise to help you design the best duplex to suit your goals.
All the effort we put in during the early stages helps your project stay on track, meaning fewer delays and a smoother execution.
Building a duplex in Sydney is a smart way to increase property value, boost rental returns and make better use of high-value land. Duplex builds are also popular for families wanting separate living zones without the cost of two standalone homes.
Can I live in one duplex and rent out the other?
Yes! We’ve seen many owners choose to live in one side of the duplex and rent out the other to help cover mortgage costs.
Can you help with knockdown rebuild duplex projects?
Absolutely. Knockdown rebuild duplexes are a great way to take advantage of your site, particularly on older blocks in established suburbs. We manage the entire process, from demolition and approvals to construction and handover.
Is my block suitable for a duplex?
Many factors influence whether your block is suitable for a duplex, from block width and slope to zoning and access requirements. After your site assessment, we’ll confirm if your land can support a duplex and let you know the options for your home.
How long does a duplex build take?
Building timelines vary depending on a number of factors, including design complexity and scope of work. Once we understand your vision, we can offer clear timelines with open communication to keep the process transparent.
We set your project on the right path from day one with our early engagement service. After we take some time to understand your goals and review your site, we’ll develop a project mood board to help you visualise the end result.
We’ll guide you through selected showrooms so you can see and feel the finishes, fixtures, and fittings in person. Our builder will be by your side every step of the way, offering advice and over 30 years of expertise to help you design the best duplex to suit your goals.
All the effort we put in during the early stages helps your project stay on track, meaning fewer delays and a smoother execution.
Explore Our Build Areas
Daniel and Chris Touma lead a team dedicated to delivering bespoke homes, renovations, and additions across Metro Sydney. From the Inner West to the Eastern Suburbs, North Shore, and Sutherland Shire, Firmus building brings transparency, craftsmanship, and care to every project
Explore how we can help bring your dream home to life. Built with integrity, precision, and personal attention from start to finish.
