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Builder developed system focuses on speed, reduced defects and scalable delivery.
Residential precast construction has traditionally remained concentrated in commercial buildings, warehouses and apartment projects, while detached housing has continued to rely heavily on brick veneer and timber framing. (main image: A completed REZICAST residential precast home in Googong, demonstrating the system’s integration of precast wall panels, thermal performance and rapid lock-up construction sequencing.)
Canberra based REZICAST® is attempting to shift that pattern through a patented residential precast building system designed specifically around speed, reduced settlement movement and simplified installation.
Founder Mick Johnson said the system emerged after years working through the technical and commercial limitations that had historically restricted precast adoption in mainstream housing.
“I wanted to create a residential precast system that was comparable in price to rendered brick veneer housing,” Johnson told Built Offsite.
“Ten or eleven years ago it was already difficult to get bricklayers, even for renovation work.
Trade shortages were becoming obvious long before people started openly talking about them.”
Johnson’s route into construction was unconventional. Before entering the building industry in his mid-thirties, he worked as a shearer and rodeo clown before later completing his builder’s licence and operating a renovation business.
REZICAST evolved from an earlier business, Precast Homes, established more than a decade ago. Over several years, Johnson refined the system before formally launching REZICAST in 2020 following the Black Summer bushfires.
Unlike vertically integrated modular or prefabrication businesses, REZICAST positions itself as a licensed construction system rather than a builder or manufacturer.
The company supplies engineering, structural documentation, proprietary hardware systems and panel integration methodology while licensed builders work with local precast manufacturers.
“We’re not a precast plant ourselves,” Johnson said.
“We connect builders with local precast manufacturers around the country because transport costs become a major issue if panels are travelling long distances.”
Faster lock up stages reshape construction sequencing
The REZICAST process differs from conventional housing sequences by installing wall panels and roof trusses before pouring the slab inside the structure.
Johnson describes the system as effectively allowing the home to “float like a boat on the ocean”, reducing reliance on slab performance and minimising settlement movement.
The company claims a standard four-bedroom single-storey home can reach lock-up stage in around 10 days, with full completion achieved in approximately 10 weeks depending on project type and fit-out complexity.
“The speed is really in the lock-up phase,” Johnson said.
“Walls and trusses go up first, then the slab is poured inside the structure. There’s no traditional set-out or extensive formwork for concreters.”
Once lock-up is achieved, the remaining process returns largely to conventional trades including plastering, painting, joinery, tiling and fit-off.
Johnson argues the accelerated lock-up stage creates substantial cashflow advantages for builders by allowing earlier access to progress payments tied to lock-up milestones.
The system also attempts to address several issues historically associated with residential precast including moisture management and cracking.
A patented internal cavity system creates a thermal break while internal walls within single-storey configurations remain non-load-bearing, allowing greater design flexibility and reducing stress transfer through the structure.
“We also developed what we call a moisture cavity,” Johnson said.
“It creates a thermal break and helps manage moisture inside the system.”
The company is also positioning the system around resilience and long-term durability, particularly in bushfire zones and areas with difficult ground conditions.
According to Johnson, several government housing organisations and NDIS related projects have shown interest due to reduced maintenance requirements and the flexibility created by fewer structural internal walls.
REZICAST explores hybrid modular integration
While REZICAST sits within the broader industrialised construction landscape, Johnson does not view the system as competing directly against modular construction.
Instead, the company is currently exploring hybrid delivery models combining modular upper levels with REZICAST ground floor systems and firewall structures.
“In fact, we’re currently exploring combining modular construction with REZICAST,” Johnson said.
“We’re looking at modular upper levels sitting on REZICAST ground floors and firewall systems for duplex developments.”
The company has also established nationally accredited builder training programs through Registered Builders Network in Victoria, aimed at increasing familiarity with residential precast systems among conventional builders.
Johnson believes one of the industry’s largest barriers remains perception rather than technical capability.
“There’s still a misconception that precast is extremely expensive and unsuitable for housing,” he said.
“A lot of residential builders simply haven’t had exposure to systems like this.”
Find REZICAST Systems HERE and featured on Jamie Duries Future House series HERE
