It's taken less than nine months for developer Sherpa Property Group to sell out all 51 apartments in its <a href="https://www.apartments.com.au/new-apartments/flourish-oasis-palm-beach-7-9-sixth-avenue-palm-beach-qld-4221">Flourish Oasis</a> development in <a href="https://www.apartments.com.au/developments/palm-beach-qld-4221">Palm Beach</a>, over a year before its anticipated completion.

&nbsp;

Located at 7-9 Sixth Avenue, the $67 million development has resonated strongly with both local owner-occupiers and downsizers seeking high-quality apartments within walking distance of the beach, dining precincts and everyday amenities.

[smartcode_project:default project_id=151449 project_image_fid=357458]

Christie Leet, Founder of <a href="https://www.apartments.com.au/developers/sherpa-property-group">Sherpa Group</a>, said the sell-out reflected both the strength of the Palm Beach market and the success of Sherpa's community-first approach to development.

"The sell-out of Oasis is a fantastic outcome and reinforces the strong demand we're seeing for thoughtfully designed apartments in lifestyle locations," Leet said.

"From the outset, our vision was to create a development that genuinely enhanced the Palm Beach community while providing residents with exceptional homes and wellness-focused amenities.

"We've been incredibly encouraged by the level of local support throughout the campaign, 72.5 per cent of buyers are locals, with a significant proportion of purchasers choosing Oasis as their future home rather than an investment."

[smartcode_project:default project_id=151449 project_image_fid=357463]

Construction is now progressing following development approval, with trusted builder LPS Group delivering the project and completion anticipated in Q3 2027.

Oasis forms part of Sherpa Group's successful Flourish collection, which has become recognised for its focus on wellness, community and elevated coastal living.

[smartcode_project:default project_id=151449 project_image_fid=357469]

Residents will have private access to a rooftop amenity space featuring a pool, gym, sauna, steam room, hot and cold plunge pools, spa and barbecue facilities.

"The success of Oasis demonstrates that buyers continue to prioritise quality, location and lifestyle," Leet said.

"We are proud to have delivered a project that has resonated so strongly with the market and look forward to bringing Oasis to life for our future residents."

Sherpa recently launched <a href="https://www.apartments.com.au/new-apartments/flourish-soleira-palm-beach-1150-1160-gold-coast-highway-palm-beach-qld-4221">Flourish Soleira</a>, its third instalment of the Flourish brand in Palm Beach following Flourish Oasis and <a href="https://www.apartments.com.au/new-apartments/amargo-6-12-sixth-avenue-palm-beach-qld-4221">Flourish Amargo</a>.

[smartcode_project_cta:default project_id=151449]

Joel Robinson

Sherpa sells out Flourish Oasis in booming Palm Beach

Urban Property Group's <a href="https://www.apartments.com.au/new-apartments/la-vera-macquarie-park-94-talavera-road-macquarie-park-nsw-2113">La Vera</a> is leading the next phase of Macquarie Park's residential evolution, with the new apartment development set to become the first of several new apartment projects in the precinct to complete.

The 169-apartment building has now topped out ahead of its scheduled completion in the third quarter of 2026, as new residential investment continues to reshape one of Sydney's largest employment hubs into a true mixed-use precinct.

[smartcode_project:default project_id=134951 project_image_fid=368645]

Cox Architecture has designed La Vera to capture the best of its unique positioning on Talavera Road, orienting the building towards Lane Cove National Park.&nbsp;The building features a sculpted northern façade with flowing curves inspired by the surrounding landscape, while its city-facing elevation adopts a more structured architectural expression to maximise skyline views.

"The vision for the project was to conceive a building that adopted an organic and curvilinear form to the northern portion that faces the Lane Cove National Park," <a href="https://www.apartments.com.au/architects/cox-architecture">Cox Architecture</a> Director Felipe Miranda said.

"The residents that reside in the northern portion of the building benefit by having beautifully crafted curved balconies that speak to the natural context and heighten the relationship of their internal living spaces to the external balconies."

[smartcode_project:default project_id=134951 project_image_fid=358802]

La Vera offers a diverse mix of one, two, three, and four-bedroom configurations, with prices currently starting from $740,000. Buyers so far have been a mix of Sydney-based investors,&nbsp;metro commuters, owner-occupiers and downsizers from surrounding North Shore suburbs.

Both investors and owner-occupiers have been drawn to La Vera's proximity to Macquarie University, Macquarie University Hospital, Macquarie Centre and the Sydney Metro, infrastructure that supports both strong rental demand and a convenient lifestyle for residents.

The apartments feature full-height glazing, timber flooring throughout living areas, stone kitchen benchtops, SMEG appliances, floor-to-ceiling bathroom tiling and ducted air conditioning.

Residents will have access to a rooftop recreation level featuring a swimming pool, sauna, barbecue facilities and landscaped relaxation areas, complemented by additional communal space at ground level. Many apartments enjoy uninterrupted views across Lane Cove National Park, reinforcing the project's connection to its natural setting.

[smartcode_project:default project_id=134951 project_image_fid=364551]

<a href="https://www.apartments.com.au/developers/urban-property-group">Urban Property Group</a>, a family-owned developer and builder with nearly four decades of experience, holds a 4.5-star iCIRT rating and was Australia's first developer to introduce 10-Year Latent Defects Insurance (LDI). La Vera is the first apartment development in <a href="https://www.apartments.com.au/developments/macquarie-park-nsw-2113">Macquarie Park</a> approved to offer the additional insurance protection, alongside a five-year warranty on SMEG appliances.

Urban Property Group CEO Patrick Elias said the additional protection reflects changing buyer expectations in the off the plan market.

"Consumers are a lot more weary and a lot more concerned in buying off the plan than they ever have been. Having LDI is a tool to portray the confidence that we have in our product, and a confidence we want buyers to share," Elias said.

Following completion of the building later this year, buyers will move into their apartments well before Christmas.

[smartcode_project_cta:default project_id=134951]

La Vera closes in on completion as Macquarie Park continues residential transformation

Brisbane developer Red &amp; Co's decision to include dual key apartments in its debut Gold Coast apartment development, <a href="https://www.apartments.com.au/new-apartments/como-varsity-lakes-22-lake-street-varsity-lakes-qld-4227">COMO Varsity Lakes</a>, is proving to be one of the project's biggest drawcards, with buyers quickly snapping up the flexible residences.

More than half of the project's 36 dual key apartments have already sold, helping drive COMO beyond the 50 per cent sold mark within the first month of launch.

The strong response highlights growing demand for apartment designs that can adapt to changing lifestyles, with buyers increasingly looking for homes that accommodate multi-generational living, provide rental income opportunities or simply offer greater flexibility over time.

Located on the shores of Lake Orr, COMO will deliver 156 apartments across 16 levels, with the dual-key residences forming a limited release within the broader development.

Each combines a primary two-bedroom apartment with a fully self-contained studio on a single title, connected by a shared foyer and lockable internal door. The design allows owners to house ageing parents, adult children or guests while maintaining privacy, or lease the secondary residence to generate additional income.

Just 17 of the original 36 dual key apartments remain available.

[smartcode_project:default project_id=135546 project_image_fid=367096]

The innovative configuration combines two fully self-contained residences on a single title, typically comprising a primary two-bedroom apartment alongside a separate studio residence, connected via a shared foyer and lockable internal door.&nbsp;

The model is proving particularly attractive to owner occupiers navigating changing family dynamics and the realities of the current housing crisis.&nbsp;

[smartcode_project:default project_id=135546 project_image_fid=363511]

<a href="https://www.apartments.com.au/project-marketer/npa">NPA</a>&nbsp;CEO Andrew Erwin said dual key living was resonating strongly with modern buyers because it delivered both financial flexibility and practical lifestyle benefits.&nbsp;

“The housing crisis and rising cost of living are fundamentally changing how Australians think about home ownership,” Erwin said.&nbsp;

“Dual key apartments provide a genuine solution for families who want to stay connected while maintaining independence. Parents can help adult children save for a future home, ageing parents can remain nearby without moving into aged care, and owners still retain privacy and flexibility.

“Importantly, buyers are also recognising the financial advantages. It creates the opportunity to generate additional income from part of the home without the holding costs associated with owning a separate investment property.”&nbsp;

[smartcode_project:default project_id=135546 project_image_fid=363509]

Unlike traditional dual occupancy arrangements, the residences operate under a single title, meaning owners only incur one set of body corporate fees, council rates and holding costs.&nbsp;

The secondary residence can also evolve over time - functioning as guest accommodation, a home office, creative studio or private retreat before later becoming an income-producing asset.

<a href="https://www.apartments.com.au/developers/red-co">Red &amp; Co</a>&nbsp;Director and Co-Founder David Laverty said the strong early sales reflected growing buyer urgency and changing priorities within the market.&nbsp;

“Securing more than half of COMO’s residences within such a short timeframe is an outstanding result and a clear endorsement of both the design and location,” Laverty said.&nbsp;

“Buyers are responding to the combination of location, connectivity and amenity, but ultimately it’s value relative to other East Coast markets that is driving enquiry.”&nbsp;

“We’re also seeing strong interest from owner occupiers looking for homes that can adapt with them over time. Flexibility has become one of the most important considerations for buyers in today’s market.”&nbsp;

[smartcode_project:default project_id=135546 project_image_fid=363515]

Designed by <a href="https://www.apartments.com.au/architects/bda-architecture">BDA Architecture</a>, COMO features a mix of one-, two- and three-bedroom residences with 2.7-metre ceilings and larger-format floorplans aimed at owner occupiers, downsizers and lifestyle-focused buyers.&nbsp;

The development will feature an extensive rooftop recreation and wellness offering including a 25-metre lap pool, sundeck, barbecue and dining areas, gym, sauna, plunge baths, landscaped gardens, wellness spaces and rooftop pickleball and paddleball courts.

The remaining dual key apartments range from 137 sqm to 167 sqm and include generous three-bedroom layouts with separate self-contained studio accommodation and dual parking.&nbsp;

Erwin said the dual key concept represented a broader shift in how Australians would live in the future.

“People want homes that can evolve with their lives,” he said.&nbsp;

“A dual key apartment can suit a family today, support an ageing parent tomorrow, and potentially generate income later on. That adaptability is becoming incredibly valuable in the current environment.”

Prices currently range from $2,115,750 to $2,583,000.&nbsp;

[smartcode_project_cta:default project_id=135546]

Inter-generational living drives demand for COMO’s dual key apartments as housing pressures reshape buyer priorities 

Builder-developer&nbsp;<a href="https://www.apartments.com.au/developers/ceerose">Ceerose</a> has doubled down on its Leichhardt ambitions, lodging its second State Significant Development Application (SSDA) in the suburb in the last six months.

Their newest proposal seeks to transform a former industrial precinct into a new residential community centred around the adaptive reuse of one of the site's heritage warehouse buildings.

The new project, on a 6,930 sqm block at&nbsp;<a href="https://www.apartments.com.au/new-apartments/40-76-william-street-leichhardt-nsw-2040">40–76 William Street</a>, will bring more than 200 apartments to a suburb that has seen little to no new supply in recent years. It follows Ceerose's late 2025 SSDA for a mixed-use apartment project on nearby Parramatta Road, signalling the developer's growing investment in Sydney's Inner West.

Designed by <a href="https://www.apartments.com.au/architects/woods-bagot">Woods Bagot</a>, the redevelopment would involve the demolition of four existing industrial buildings while retaining and adaptively reusing the site's most significant warehouse. The retained structure would anchor a new residential precinct comprising five interconnected buildings arranged around a large central landscaped courtyard, with heights stepping from five storeys along the surrounding residential streets to 11 storeys at the William Street corner.

<img alt="First look: Ceerose returns to Leichhardt with 203-apartment adaptive reuse proposal at former warehouse site" data-entity-type="file" data-entity-uuid="7258c54c-8167-479e-8361-2d5fca9915b4" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Appendix%2010B%20-%20CGI%20-%20View%202.jpg?VersionId=S9DQfxu_jpcB5LrAEYFUbyMzg5odW6i5" />

According to the Architecture Design Report by Woods Bagot, the proposal "seeks to create a residential village centred around a generous green heart while celebrating the site's industrial heritage through the adaptive reuse of the existing warehouse building."

The development would comprise 203 apartments, with 188 proposed as build-to-sell residences, alongside 15 affordable housing apartments.

Rather than treating the retained warehouse as a standalone heritage object, Woods Bagot has sought to weave the site's industrial history throughout the masterplan. The proposal retains the north and west facades of the landmark corner warehouse, while new buildings reinterpret the site's brick-and-steel industrial language through their material palette and architectural expression.

<img alt="First look: Ceerose returns to Leichhardt with 203-apartment adaptive reuse proposal at former warehouse site" data-entity-type="file" data-entity-uuid="9e8c64c2-881b-49e1-8c90-6b6acaaa45b6" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Appendix%2010C%20-%20CGI%20-%20View%203.jpg?VersionId=Qm8_8H_Xrg_sc4Mdjc59vlAcKF_5wRTb" />

The design is organised around what Woods Bagot describes as a "green heart", a landscaped communal open space that reinstates the leafy character removed when the site became an industrial storage facility. A new pedestrian laneway running through the site would improve permeability between William, North and Francis streets, linking residents through landscaped public spaces while activating the ground plane.

Residents would have access to communal gardens, rooftop open space and shared recreation areas distributed throughout the development. Sustainability has also been prioritised, with the project targeting an average 7.9-star NatHERS rating. Proposed initiatives include rooftop solar generation, rainwater harvesting, passive solar design, naturally ventilated lobbies, extensive cross-ventilation and the reuse of existing building fabric to reduce embodied carbon.

The adaptive reuse strategy became a defining feature of the application after heritage investigations found only one of the site's industrial buildings could feasibly be retained. The Heritage Impact Statement concludes that preserving the key warehouse façades while referencing the site's industrial character throughout the new development provides an appropriate balance between renewal and conservation.

<img alt="First look: Ceerose returns to Leichhardt with 203-apartment adaptive reuse proposal at former warehouse site" data-entity-type="file" data-entity-uuid="efffafdb-594f-4e2b-a067-921fd51c05e1" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Appendix%2010D%20-%20CGI%20-%20View%204.jpg?VersionId=DPmE4.k16YRt0i27hEZVtJAffarpvUfx" />

"Retention and adaptation of the site buildings has been explored but found not to be feasible except for the tallest building, whose street facades will be retained," the heritage report states.

"The proposed building will interpret the brick and steel character of the subject site, including reuse of some components and construction of a large 'sawtooth' structure in the proposed open space."

<img alt="First look: Ceerose returns to Leichhardt with 203-apartment adaptive reuse proposal at former warehouse site" data-entity-type="file" data-entity-uuid="3bfef2b5-83f5-40cd-9cab-767092f34266" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/Appendix%2010E%20-%20CGI%20-%20View%205.jpg?VersionId=7asb3i_ql4ybbuJOUb5UHBEIy0Q9t.DF" />

The William Street site is located around 300 metres from Leichhardt North Light Rail station and a short walk to Norton Street's retail, dining and hospitality precinct. The surrounding area has increasingly become a focus for urban renewal given its proximity to public transport and the Parramatta Road corridor.

Ceerose, founded by Edward Doueihi in 1998, has become one of Sydney's more active apartment developers, with completed projects including The Alex Collective in Alexandria, Abbie's Lane in Annandale, and the award-winning Munro House in Elizabeth Bay. They are currently delivering Belgravia, 17 luxury apartments in Potts Point.

First look: Ceerose doubles down in Leichhardt with adaptive reuse of former warehouse site

Melbourne developer Spacious Group has completed Voyage Altona, one of the closest new apartment developments to Altona Beach.

Off the plan purchasers have started moving into the 49-apartment project on Pier Street, with the remaining move-in-ready one-, two- and three-bedroom apartments starting from just over $500,000.

Display apartments have now been fitted out, allowing prospective buyers to inspect the completed residences by appointment.

[smartcode_project:default project_id=112195 project_image_fid=372638]

The completed apartments feature open-plan living and dining areas which extend onto private balconies and terraces, while full-height glazing maximises natural light throughout the interiors.&nbsp;

Hybrid timber-look flooring, stone benchtops, Miele appliances, porcelain-tiled bathrooms and generous storage feature throughout the building which also features landscaped communal areas, expansive shared terraces, lift access and secure on-grade parking.

Drawing inspiration from its bayside setting, Voyage adopts a restrained palette of warm neutral tones and textured finishes. Many of the apartments take advantage of views across Port Phillip Bay, while the indoor-outdoor living spaces have been designed to make the most of the coastal outlook.

[smartcode_project:default project_id=112195 project_image_fid=3286]

Voyage was developed to address what Spacious Group identified as an undersupply of higher-quality apartment product in Altona, with a focus on owner-occupiers looking to remain within the bayside community.

"Voyage responds to very strong local buyer demand for quality, owner-occupier-focused product," says Barry Plant Projects Director Jarrod Farey, who has handled sales since the project's launch.

"The project delivers an elevated lifestyle proposition, with its design and quality of finish far exceeding anything previously produced in the area, as well as its proximity to Pier Street Village and the beach."

The majority of purchasers have been local downsizers and owner-occupiers looking to stay within the Altona community but who previously had limited opportunities to buy a brand-new apartment.

[smartcode_project_cta:default project_id=112195]

Spacious Group completes Voyage Altona in Altona's beachside precinct

Construction Materials

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GUEST OBSERVATION
Would you live in a house made of fungus? It’s not just a rhetorical question: fungi are the key to a new low-carbon, fire-resistant and termite-deterring building material.
This type of material, known as a mycelium composite, uses the Trametes versicolor fungus to combine agricultural and industrial waste to create lightweight but strong bricks. It’s cheaper than synthetic plastics or engineered wood, and reduces the amount of waste that goes to landfill.
What a fun guy
<img src="https://images.theconversation.com/files/222698/original/file-20180612-182738-1ih1ie4.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">
Fungal brick prototypes made from rice hulls and glass fines waste. Tien Huynh, Author provided
Working with our colleagues, we used fungus to bind rice hulls (the thin covering that protects rice grains) and glass fines (discarded, small or contaminated glass). We then baked the mixture to produce a new, natural building material.
Making these fungal bricks is a low-energy and zero-carbon process. Their structure means they can be moulded into many shapes. They are therefore suited to a variety of uses, particularly in the packaging and construction industries.
A staple crop for more than half the world’s population, rice has an annual global consumption of more than 480 million metric tonnes and 20% of this is comprised of rice hulls. In Australia alone, we generate about 600,000 tonnes of glass waste a year. Usually these rice hulls and glass fines are incinerated or sent to landfill. So our new material offers a cost-effective way to reduce waste.
<h2>Fire fighter</h2>
Fungal bricks make ideal fire-resistant insulation or panelling. The material is more thermally stable than synthetic construction materials such as polystyrene and particleboard, which are derived from petroleum or natural gas.
<img src="https://images.theconversation.com/files/222694/original/file-20180612-182738-2kd2vm.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">
Rice hulls, glass fines and the mixture of rice, glass and fungus, before baking. Wikipedia/Tien Huynh, Author provided
This means that fungal bricks burn more slowly and with less heat, and release less smoke and carbon dioxide than their synthetic counterparts. Their widespread use in construction would therefore improve fire safety.
Thousands of fires occur every year and the main causes of fatalities are smoke inhalation and carbon monoxide poisoning. By reducing smoke release, fungal bricks could allow more time for escape or rescue in the event of a fire, thus potentially saving lives.
Bug battler
Termites are a big issue: more than half of Australia is highly susceptible to termite infestations. These cost homeowners more than A$1.5 billion a year.
Our construction material could provide a solution for combating infestations, as the silica content of rice and glass would make buildings less appetising to termites.
The use of these fire-and-termite-resistant materials could simultaneously revolutionise the building industry and improve waste recycling.
<img src="https://images.theconversation.com/files/222699/original/file-20180612-182733-qjotvb.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">
 Figure 3. Termite infestation zones in Australia. termitesonline.com.au, Author provided
This is an exciting time to get creative about our waste. With China no longer buying Australia’s recycling – and new rules reducing plastic use in Australian supermarkets – we have the chance to move in line with communities in Japan, Sweden and Scotland that have near-zero waste.
Fungal bricks could be just one example of the creative thinking that will help us get there.
Tien Huynh, Senior Lecturer in the School of Sciences, RMIT University
Mitchell Jones, PhD Student, RMIT University
This article was originally published on <a href="http://theconversation.com" target="_blank">The Conversation</a>. Read the <a href="https://theconversation.com/scientists-create-new-building-material-out-of-fungus-rice-and-glass-98153" target="_blank">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

Scientists create new building material out of fungus, rice and glass

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The use of cheap building materials imported from China could be compromising people's safety, according to construction materials company Boral Limited chief executive Mike Kane.
Concerns about cladding on buildings have been raised in the aftermath of the fire at London's  Grenfell Tower last week in which at least 79 people are feared killed.
The fire has led to speculation about the causal factors and raised questions about the role of building products. 
Kane, who saw several of his products boycotted by unions in Australia due to industrial action, said he was concerned about cheaper materials flooding into the country and being used for the apartment boom, The Australian Financial Review reported.
"The lure of cheap Chinese products that don't meet western standards is part of what has happened in England and Melbourne," Kane told the AFR.
"They do tend to be cheaper and that can be an incentive [for developers]."
The increased use of environment-efficient materials over safety standards could also pose a risk, added Kane.
"There are people who are so focused on climate change that they are forgetting safety. We have multiple obligations when building but the first is structural - the building shouldn't collapse and fire safety is fundamental of all."
Cladding on buildings may not comply with the Building Code of Australia either because of incorrect labelling - an issue industry bodies such as Ai Group have campaigned over - or because builders or subcontractors incorrectly use a product in a role other than that for which it is suited.
Melbourne's Lacrosse building, which caught fire in 2014, is a case in point. Aluminium composite panels of the sort used in Lacrosse are up to standard when used the right way internally but not when put on the outside of the building, as they are not strong enough to withstand fire. 
Last year, the Victorian Building Authority regulator referred building surveyor Anastasios Galanos for disciplinary action by the Building Practitioners Board, alleging he breached the Building Act and regulations when he certified the Lacrosse tower as compliant. 
Last July, imported roofing panels in Perth's newly built Children's Hospital were discovered to contain asbestos. A week later Australian Border Force suspended all imports by materials supplier Yuanda Australia. 
Private construction group Built chief executive Brett Mason also questioned some of the quality of Chinese products in the market.
"There was a flood of products that came in with the right stamps but some of the fittings and cladding were poorer quality and in some cases it looked as though it may not have been given genuine approval," Mason said.
"We now go and test everything ourselves even if it has a stamp of approval on it."
 
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jonathanchancellor-7SQnKwU6yx

Cheap Chinese building materials pose safety risk, says Boral's Mike Kane

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<img src="https://counter.theconversation.edu.au/content/57114/count.gif" alt="The Conversation" width="1" height="1">
GUEST OBSERVER
By itself, concrete is a very durable construction material. The magnificent Pantheon in Rome, the world’s largest unreinforced concrete dome, is in excellent condition after nearly 1,900 years. And yet many concrete structures from last century – bridges, highways and buildings – are crumbling. Many concrete structures built this century will be obsolete before its end.
Given the survival of ancient structures, this may seem curious. The critical difference is the modern use of steel reinforcement, known as rebar, concealed within the concrete. Steel is made mainly of iron, and one of iron’s unalterable properties is that it rusts. This ruins the durability of concrete structures in ways that are difficult to detect and costly to repair.
While repair may be justified to preserve the architectural legacy of iconic 20th-century buildings, such as those designed by reinforced concrete users like Frank Lloyd Wright, it is questionable whether this will be affordable or desirable for the vast majority of structures. The writer Robert Courland, in his book Concrete Planet, estimates that repair and rebuilding costs of concrete infrastructure, just in the United States, will be in the trillions of dollars – to be paid by future generations.
Steel reinforcement was a dramatic innovation of the 19th century. The steel bars add strength, allowing the creation of long, cantilevered structures and thinner, less-supported slabs. It speeds up construction times, because less concrete is required to pour such slabs.
These qualities, pushed by assertive and sometimes duplicitous promotion by the concrete industry in the early 20th century, led to its massive popularity.
Reinforced concrete competes against more durable building technologies, like steel frame or traditional bricks and mortar. Around the world, it has replaced environmentally sensitive, low-carbon options like mud brick and rammed earth – historical practices that may also be more durable.
Early 20th-century engineers thought reinforced concrete structures would last a very long time – perhaps 1,000 years. In reality, their life span is more like 50-100 years, and sometimes less. Building codes and policies generally require buildings to survive for several decades, but deterioration can begin in as little as 10 years.
Many engineers and architects point to the natural affinities between steel and concrete: they have similar thermal expansion characteristics, and concrete’s alkalinity can help to inhibit rust. But there is still a lack of knowledge about their composite qualities – for example, in regard to sun-exposure-related changes in temperature.
The many alternative materials for concrete reinforcement – such as stainless steel, aluminium bronze and fibre-polymer composites – are not yet widely used. The affordability of plain steel reinforcement is attractive to developers. But many planners and developers fail to consider the extended costs of maintenance, repair or replacement. 
There are technologies that can address the problem of steel corrosion, such as cathodic protection, in which the entire structure is connected to a rust-inhibiting electric current. There are also interesting new methods to monitor corrosion, by electrical or acoustic means.
Another option is to treat the concrete with a rust-inhibiting compound, although these can be toxic and inappropriate for buildings. There are several new non-toxic inhibitors, including compounds extracted from bamboo and bacterially derived “biomolecules”.
Fundamentally, however, none of these developments can resolve the inherent problem that putting steel inside concrete ruins its potentially great durability.
<h2>The environmental costs of rebuilding</h2>
This has serious repercussions for the planet. Concrete is the third-largest contributor to carbon dioxide emissions, after automobiles and coal-fuelled power plants. Cement manufacturing alone is responsible for roughly 5 percent of global CO₂ emissions. Concrete also makes up the largest proportion of construction and demolition waste, and represents about a third of all landfill waste.
Recycling concrete is difficult and expensive, reduces its strength and may catalyse chemical reactions that speed up decay. The world needs to reduce its concrete production, but this will not be possible without building longer-lasting structures.
In a recent paper, I suggest that the widespread acceptance of reinforced concrete may be the expression of a traditional, dominant and ultimately destructive view of matter as inert. But reinforced concrete is not really inert.
Concrete is commonly perceived as a stone-like, monolithic and homogeneous material. In fact, it is a complex mix of cooked limestone, clay-like materials and a wide variety of rock or sandy aggregates. Limestone itself is a sedimentary rock composed of shells and coral, whose formation is influenced by many biological, geological and climatological factors.
This means that concrete structures, for all their stone-like superficial qualities, are actually made of the skeletons of sea creatures ground up with rock. It takes millions upon millions of years for these sea creatures to live, die and form into limestone. This timescale contrasts starkly with the life spans of contemporary buildings.
Steel is often perceived to be inert and resilient too. Terms such as “Iron Age” suggest an ancient durability, although Iron Age artefacts are comparatively rare precisely because they rust. If construction steel is visible, it can be maintained – for instance, when the Sydney Harbour Bridge is repeatedly painted and repainted.
However, when embedded in concrete, steel is hidden but secretly active. Moisture entering through thousands of tiny cracks creates an electrochemical reaction. One end of the rebar becomes an anode and the other a cathode, forming a “battery” that powers the transformation of iron into rust. Rust can expand the rebar up to four times its size, enlarging cracks and forcing the concrete to fracture apart in a process called spalling, more widely known as “concrete cancer”. 
I suggest that we need to change our thinking, to recognise concrete and steel as vibrant and active materials. This is not a case of changing any facts, but rather of re-orientating how we understand and act on those facts. Avoiding waste, pollution and needless rebuilding will require thinking well beyond disciplinary conceptions of time, and this is especially true for the building and construction industries.
The collapsed civilisations of the past show us the consequences of short-term thinking. We should focus on building structures that stand the test of time – lest we end up with hulking, derelict artefacts that are no more fit for their original purpose than the statues of Easter Island.
Guy Ceulemans is associate lecturer, UNSW Australia and author for The Conversation. He can be contacted <a href="https://theconversation.com/profiles/guy-keulemans-182421" target="_blank">here</a>.
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