What are the blue house frames on The Block?
And why do they matter?
For years, house frames made from TRUECORE® steel have helped deliver the high-quality homes on The Block, all within the incredibly tight timelines that the show is famous for.
The distinctive blue colour of TRUECORE® steel can be seen everywhere on site for the first 4-6 weeks as the contestants race to finalise their designs and finish their first rooms in time for the judges. And there are many reasons it has become a familiar sight every year on The Block:
TRUECORE® steel is 100% termite and borer proof, without needing additional and expensive insecticide treatments. So, whether you’re in a high-risk area in the country, or the heart of the city, you can enjoy the peace of mind that TRUECORE® steel will help protect your investment from the inside out.
TRUECORE® steel can be precision-engineered for dimensionally accurate frames, delivering super-straight walls and ceilings – even over long distances – like the soaring cathedral ceilings over 3m+ high walls in 2025.
Frames made from TRUECORE® steel are also straight and true - and built to stay that way. They won’t twist or warp over time, so there’s less chance of sticking windows, jammed doors and wavy roof lines as the years go by.
Frames made from TRUECORE® steel are lightweight and strong which may help reduce the need for additional structural supports in some designs (subject to engineering requirements), but also make it easier to deliver open-plan living spaces and bigger openings for doors and windows like in Season 19 of The Block, maximising light throughout your home and helping you create the open plan living spaces you dream of.
It’s easy to create curves that play such a key role in current design trends.
They won’t catch fire and can help you meet the standards required for building in bushfire prone areas.
They can also be readily prefabricated off-site, speeding up the construction process.
Under TRUECORE® steel's distinctive blue finish is our metallic coating with BlueScope's patented Activate® technology, providing enhanced resistance to corrosion and long life. Strong and durable, a house frame made from TRUECORE® steel can safeguard the integrity of your home, helping protect your investment and your family. TRUECORE® steel is backed by a 50-year warranty* for eligible applicants from BlueScope, Australia’s largest steel manufacturer and the makers of COLORBOND® steel - giving you peace of mind.
Homes on The Block continue to showcase what's possible when great design is paired with quality materials. Behind many of those impressive builds is framing made from TRUECORE® steel, helping provide the strength and reliability needed to bring ambitious visions to life. So, if you're starting your own building journey, make sure you ask your builder for TRUECORE® steel or find a builder at our supplier locator.
More news from The Block
Just like our steel, our partnership with The Block is built to last. Read more about our involvement with one of Australia’s most popular television shows.
Discover the strength behind this season's homes with steel framing made from TRUECORE® steel.
Last year’s Block introduced an important new variation to the traditional Block format. And its back in 2026.
Thank you to our valued partners of The Block 2026.
