The Magic of the Elusive BIM and 5D

Author: Monisha Craig

When accuracy and speed define the success of a construction project, Building Information Modelling (BIM) and 5D Cost Planning should be more than just words that get thrown around. They’re essential tools for experts to develop a smarter, more integrated way of working. As Caitlin Shields, Queensland Partner at Mitchell Brandtman and expert in 5D and BIM, puts it, “The original intent of BIM was a methodology or ideology about how teams should work. It’s not just a physical thing; it’s a way of thinking.” At its core, BIM is a collaborative process underpinned by digital technologies. It allows stakeholders to develop a coordinated digital representation of a project, incorporating data across all disciplines.  

It starts with what’s available, as Caitlin explains. A 3D model (or model) is provided, and Quantity Surveyors utilise this information to introduce the 5D aspect: cost. “The model is one part. The real value is in the information, it’s about how well that information is structured and shared.” Caitlin says. It’s about using all components of a project and how that information is structured, analysed, and ultimately used to make better decisions. Quantity Surveyors use this data not to author, but to consume, organise and analyse.

In traditional workflows, Quantity Surveyors spend the majority of their time measuring from 2D documents. BIM flips that paradigm. “The models give us quantities rapidly, so we spend less time counting and more time asking the critical questions about why things cost what they do.”

The result is a deeper cost analysis that is provided within an expedited timeframe. Teams can run iterations, refine estimates multiple times (not just at traditional milestone points), and deliver insights in real-time to keep pace with evolving project needs. “The magic of 5D is when we can link the cost data directly from the model outputs so when the design changes, the cost changes with it.” Caitlin explains.  

The Utilisation of BIM

Despite its clear benefits, BIM and 5D adoption remains patchy across the industry. Why? The answer is simple. It is not mandated. “I’m an advocate for governments to make it mandatory and make people do it right.” Caitlin says. Owners and developers often don’t ask for BIM because they don’t fully understand its value. Many projects are delivered and immediately sold off meaning the long-term benefits of embedded digital information are lost on those footing the bill.

Barriers to BIM adoption in Australia: derived from Sompolgrunk et al. (2023)

Without incentive or pressure from clients, many project teams stick to old methods. Even subcontractors and trades are often disengaged from the BIM process. “You’ve still got a whole industry that’s full of tradies in utes with invoices in their glove box. They’re not thinking about digital models and most importantly that transfer of knowledge if project information.” But Caitlin argues the tide is turning. Those who are engaging with BIM, are beginning to see just how much it can transform project delivery. BIM enables everyone, from architects and engineers to trades and financiers, to be on the same page. And for projects that get it right, the outcomes speak volumes.

A ‘Sunny’ Example

Mitchell Brandtman’s involvement in the $1.8B Sunshine Coast Public University Hospital project is an example of BIM and 5D at its best. “That was a gem of a project and a game changer in our methodologies” Caitlin recalls. “We were not involved from the beginning, but when we arrived, we were able to give rapid and Repetitive feedback on quantities and model information which influenced the way software providers structured their outputs. The result was a seamless process from design to delivery by providing virtual trade packages, digital coordination, and collaboration.

The project didn’t just benefit from efficiencies the team provided, but it also helped shape industry standards. It’s proof that when Quantity Surveyors are engaged early and enabled to work in 5D, everyone wins.

Who Benefits and Who’s Using It

The answer to who benefits is everyone. But the biggest gains are for asset owners, operators, and those managing portfolios over time. Caitlin is especially passionate about where BIM is gaining traction now. Major players across public and private sectors are beginning to understand the long-term operational gains of having a ‘digital twin’. A digital twin is valuable for owners and operators, especially in sectors like healthcare, aged care, education, or government, where understanding and maintaining a building over its lifespan is essential. “They want their real building and a digital building. The digital one holds all the information, when warranties expire, when to replace things, what materials were used. That’s incredibly powerful.”

These are long-term assets, often heavily maintained and managed. With BIM, lifecycle costs can be controlled better. Even Build-to-Rent developers are beginning to see the light. While not mandated, many of them work with designers who are already producing models, meaning the QS can use those for fast and accurate cost planning. “It’s a tailored experience. Even for townhouses or multi-res, we use models where we can. There’s value being delivered even if the client doesn’t know we’re doing it.” says Caitlin.

A white paper by Autodesk (2021) reported that BIM engagement in Australia/New Zealand is slightly below the global average, with 46% of respondents using it on at least half their projects, an average usage rate of 50%, compared to the global 52%. However, a more recent publication by Deloitte and Autodesk (2025) reports that Australian construction businesses have increased their average use of digital technologies from 5.3 in 2024 to 6.9 in 2025, with BIM identified as a prominent technology, indicating broader adoption across the industry.

One of the most common misconceptions is that 5D, or the use of digital collaboration can only happen when models are 100% perfect. Caitlin reminds us that this notion of BIM is a methodology and should be a tool in the whole development process, “We don’t throw the baby out with the bathwater. We’ll use whatever information we’re given, models, 2D documents, schedules and we’ll make it work.” That adaptability is a hallmark of Mitchell Brandtman’s approach. For over two decades, the company has been at the forefront of BIM and 5D implementation. Not just using the tools, but shaping the processes, leading conversations with software vendors, and influencing digital project delivery standards in Australia.

Where others are only now beginning to promote 5D as part of their services, Mitchell Brandtman has been doing it for a long time. The company’s extensive benchmarking database, internal validation tools, and collaboration are at the core of the company and team members values. And clients see the benefits. “They just get better outcomes. Contingency considerations, better feasibility, fewer variations. Because we’ve spent more time analysing, not measuring.” With the 2032 Brisbane Olympics on the horizon, BIM and 5D are expected to play a role in the construction of such a mammoth of a task. 

Philosophy to Delivery

BIM and 5D aren’t just digital tools, they’re a philosophy and a way of delivering projects better. As Caitlin explains, “This is about using better information to make better decisions. It’s not faster and cheaper, it’s smarter and more confident. That’s how we add value. ”Whether working with operators, government agencies, financiers, or developers, Mitchell Brandtman’s approach to BIM and 5D helps projects move from concept to construction with greater clarity and collaboration.

“We’re advocates,” Caitlin says. “Not because it’s shiny and new but because we’ve seen what happens when it’s done well.” For clients, the takeaway is clear; if you want a project with intelligent cost outcomes, BIM and 5D should not be seen as optional extras. They’re the future of Quantity Surveying and Mitchell Brandtman is already there.

Sources:

  • Autodesk, 2021. BIM and digital transformation: 2021 Australia and New Zealand insight report. [online] Available at: https://damassets.autodesk.net/content/dam/autodesk/www/industry/aec/bim/aec-smart-market-insight-2021-bim-digital-transformation-australia-new-zealand-en.pdf [Accessed 25 Jul. 2025].
  • Deloitte Access Economics and Autodesk, 2025. State of digital adoption in the construction industry 2025. [online] Deloitte. Available at: https://www.deloitte.com/au/en/services/economics/analysis/state-digital-adoption-construction-industry.html [Accessed 25 Jul. 2025].
  • Sompolgrunk, A., Banihashemi, S., Hosseini, M. R., Golzad, H., & Hajirasouli, A. (2023). ‘An integrated model of BIM return on investment for Australian small- and medium-sized enterprises (SMEs)’. Engineering, Construction and Architectural Management, 30(5), 2048–2074.

In the world of property development, cost overruns and last-minute design changes are often accepted as part of the process. But what if they didn’t have to be? According to Alan Tan, our Partner in Victoria, there’s a significant yet underutilised opportunity to take control of project costs long before a single shovel hits the ground, during the design development stage.

“Construction cost is considered the most expensive item in a development project,” Alan stresses. “Often it could equate to half of the total development costs. So, it makes sense to focus on that, but we don’t often see developers invest in updating, optioneering, and managing the construction cost at various design stages.”

At Mitchell Brandtman, we’ve seen time and again that engaging a quantity surveyor throughout the design development stage can make or break the success of a project.  There were developers rushing from planning approval to tender, missing out on important stages in the design process. As Alan puts it, “They just go straight to the builder and ask, ‘How much?’. But there’s just not enough information at that point, and that’s where cost surprises come in.”

Costing the Design versus Designing to Cost: A core idea Alan puts as a powerful shift in project thinking is the difference between costing the design and designing to cost. “You’ve got two ways to approach it,” he says. “Costing the design, where you do the design first, then find out the cost. Or designing to cost, where you let the cost guide your decisions as the design evolves. The second approach gives you far more opportunities at lower cost and risk.” Alan shares that at feasibility or business case stage, QSs collaborate with design teams to explore alternatives like repurposing vs. rebuilding, residential vs. commercial, or comparing above-ground and basement parking options. “Without early costing appraisal, how do you know if these options are viable? That’s the kind of strategic input we provide from an early stage.”

Big-Ticket Items and Life Cycle Costing

Alan’s approach is refreshingly pragmatic, which includes material selection and looking at future performance, not just upfront cost.

“We prepare a cost plan that breaks down the individual components so we can identify, say top 10 big-ticket items to review in detail. That’s where the money is. Every 10% – 20% savings on those items could mean hundreds of thousands in real savings.” On the flip side, this doesn’t mean slashing features indiscriminately. “Some expensive finishes and features may only be small quantities, but they add major visual value. So, we appreciate them, especially if the total cost is not significant.”

The “Cost of Change Curve”, a concept widely discussed in project management, highlights the importance of early decision-making in project development. Implementing changes during the initial design phases is more cost-effective and less disruptive than making alterations in later stages.

Alan also advocates for life cycle costing and value engineering appraisals. “Sometimes it’s better to spend more now if it means lower maintenance, replacement and fewer disruptions later,” says Alan. “This is especially important in sectors like healthcare, banking and data, where even a day of downtime is catastrophic and costs many times more.” However, he also notes there’s a balance to strike. “…with technology or trend evolving so quickly, it’s often not worth investing heavily in items that will be obsolete in a few years.”

Why Projects Blow the Budget: When asked about the kinds of projects most vulnerable to budget blowouts, Alan indicates that it’s not about project type. “You can have a straightforward project but still blow the budget if you lack cost monitoring, control, and management throughout. Some projects involve Quantity Surveyors at the schematic stage [A]: then stop with no QS involvement during design development stages B and C. Suddenly, QSs are requested to review tender returns. The opportunity to manage cost and value by then is greatly reduced.”

The Value of Expertise Over Automation

So how does a QS offer such tailored advice? It comes down to benchmarking and detailed cost analysis. “We’ve worked on so many types of projects; we have the historical data and benchmarking analysis tools,” says Alan. “We can analyse and compare the costs, functional areas and ratios. That’s how we know where to flag potential issues and opportunities.”

Documentation also plays a major role in cost certainty. Alan adds, “If design documents are incomplete or inconsistent, then you’re going to get variations. BIM and clash detection tools help here, but you still need a human eye to interpret and advise.” In today’s buzz around AI and digital tools, Alan is cautiously optimistic but remains firm on the value of human insight. “It’s a tool, not a substitute for expertise,” he says. “We’re not just measuring and plugging numbers into software. We’re analysing, balancing and managing value for stakeholders throughout the project lifecycle from early stages.”

Final Thoughts

The key message from our interview with Alan Tan: don’t underestimate the value of the design development stage. It’s the best opportunity to add value, minimise waste, and ensure your budget works for the building. In his words, “Quantity Surveyors are not just about cutting costs like in the 1960s or 70s. Today, it’s about guiding design with insight, managing costs early, and making sure every design decision adds long-term value.”

As Australia’s construction sector continues to navigate economic uncertainty, the conversation is shifting. While inflation and interest rates dominate headlines, industry leaders are turning their attention to a deeper, more persistent issue: shortage of labour. In this landscape of inconsistent costs, understanding the real drivers behind construction budgets has never been more critical.

The Australian construction industry continues to grapple with rising costs, but it’s not just about inflation, interest rates, or even materials. According to Darryl Bird, Queensland Partner, the most pressing challenge impacting budgets today is clear: labour. While interest rates and inflation get most of the headlines within the industry, Darryl explains that these economic factors are “compounding the problem that we’ve already got”. Construction costs were already under stress due to systemic issues, mainly, labour. He notes that issues like material supply, which caused disruption and uncertainty through COVID, is now something the industry is managing more effectively and has subsequently settled into “a new norm”.

BuildSkills Australia, the national skills body for construction workforce development, reported in March 2024 that 90,000 new tradespeople would be needed by the year’s end. However, Australian Bureau of Statistics (ABS) indicated that by November 2024, the industry only managed to hire over 50% of the target. Source: BuildSkills Australia, 2024; ABS, 2024

The market, he says, is adjusting to these new norms with greater resilience than during the disruptions of COVID. Inflation and global trade tensions are creating unpredictability in material access and pricing. But not all international trends are negative. As Darryl notes, U.S. tariffs on imports may offer unexpected advantages: “With a government focussed on turning towards more internal manufacturing, the application of international tariffs by the U.S. may provide opportunities for Australia to access more materials from countries like China and India.  It may actually have the reverse effect to what has been described to us in the press,” Darryl suggests.

Across the country, cost pressures vary by state and sector. Victoria’s residential market is showing signs of increased competition and more stable pricing. While residential markets like Melbourne are seeing competition return, Darryl points out that in Queensland, “we’re seeing the most risk going forward is in the upper end of town, in the more commercial construction space.” He adds, “The demand on the local contractor and labour pool in this space is where we’re going to see most challenges.” While the media focus at the moment is on productivity and getting more from our existing workforce, we need to be aware that workforce also need to expand to meet future demands.

The current cost risk isn’t from timber or steel, it’s from people. “Labour by far,” Darryl states, when asked about the industry’s top concern. While material price hikes are often visible and publicised, he warns that these figures are often misunderstood, “When you work material supply price increases through the entirety of a construction project or contract sum… the impact on the bottom line cost is watered right down.” In contrast, labour costs impact all trades, all projects and every site, and “remains a problem right across Australia… it’s not a challenge that can be quickly and easily solved.”

Adding to the complexity, Darryl explains that “it’s not just about direct labour cost, but also availability and the cost impost of getting labour and keeping resources on site … it can be difficult and unpredictable.” Unlike materials, which can be budgeted, managed and pre-ordered, labour availability can shift overnight due to competing projects and opportunities available to our contractor and subcontractor pool in this market. Whilst this challenge is difficult to mitigate completely, we must be prepared from project inception. “We observe a lot of time, effort and cost wasted in a development project exploring design concepts that are just not feasible in this market,” Darryl says. The key is early involvement of Quantity Surveyors who can provide data-led insights, cost-led design advice, and guide clients toward feasible delivery models from day one. “As a QS our value is best realised at that early stage… leveraging the data and experience we have to provide reliable cost information and alternatives at the very start,” he explains. Mitchell Brandtman is also increasingly called on to help navigate risk throughout construction. The earlier a QS is involved, the more opportunity there is to implement risk mitigation measures and avoid costly mistakes. If that opportunity for early engagement is missed: “The snowball’s already rolling down the hill…, the problems are there already,” Darryl warns.

One way the industry is looking to address labour shortages, is through the growth of Modern Methods of Construction (MMC), including modular and prefabricated systems. Whilst this sector once battled market acceptance and cost premium hurdles these challenges have eased, “MMC is becoming a much more attractive option than it once was… it’s becoming more popular because construction and manufacturing largely occurs in a warehouse, you’re not subject to rain, inclement weather conditions.” Local manufacturers are delivering high quality products that meet Australian standards and aesthetic expectations, and the cost gap between traditional and modular is narrowing. He emphasises that MMC doesn’t just mean full prefabricated buildings: “There’s modular components – wall and structural systems, bathroom pods, stair systems – that reduce on-site labour pressures.”

The Construction Industry Training Board (CITB) highlights the quantifiable benefits of modular construction, noting it can accelerate project timelines by up to 50% and reduce on-site labour by up to 80%. Source: CITB

Despite the challenges, Darryl sees signs of optimism, “I think the sentiment in the industry has certainly changed… people are more focused on solutions and tackling the industry challenges.” For developers, that means thoughtful designs, smarter delivery methods, early QS engagement, and close collaboration with all parties, “Looking at delivery partners that can solve problems or establish risk mitigation measures nice and early… the builder is a big part of that.” Asking, “What works for you? How does that work for us?… Having proactive and collaborative conversations with builders, subcontractors and suppliers about the collective challenges will enable the team to be better equipped to navigate issues like labour availability and volatility and create more certainty amongst the delivery team.” This approach leads to more thoughtful decisions, fewer surprises, and outcomes that help balance cost, time and quality. Alternate procurement methods, where “risk can be shared and addressed in an appropriate way” rather than transferred blindlyin a challenging market, is another opportunity identified by Darryl.

The message is clear, managing construction cost inflation in Australia isn’t just about tracking economic headlines. It’s about tackling the root cause, labour shortages, and planning smarter from the ground up and from project inception.

Cost overruns are one of the biggest challenges in all construction projects. From increasing material costs to unforeseen site conditions, maintaining financial control requires careful planning, proactive cost management, and the involvement of a Quantity Surveyor (QS) from the project’s inception. At Mitchell Brandtman, we understand that a successful project requires more than good intentions; it requires a strategic approach to cost planning and management.

Proactive Planning and QS Involvement

A project’s success is largely determined by being proactive during the early planning stages. A 2021 report by Infrastructure Australia found that Australian governments overspent by A$34 billion (21%) on transport projects completed between 2001 and 2015. Larger projects exceeding A$1 billion were especially prone to cost overruns, with nearly half exceeding initial budgets by an average of 30%. Engaging a QS from the outset can ensure the development of a realistic and accurate project budget to avoid these kinds of cost overruns. This means establishing an achievable budget from the beginning, providing accurate cost estimates throughout the design phases, and identifying potential financial risks while recommending solutions to mitigate them.

Queensland Partner, Maoibh Russell, explains: “It’s about being proactive with your planning and setting clear budgets early. This means talking to your quantity surveyor early, not just going straight to the builder to obtain a price. You need to have done an in-depth review of your project to set clear budgets from the start.”

One important tool in a Design and Construct contract scenario is to develop at an early stage the Principal’s Project Requirements (PPR), which establishes clear project goals and the Principal’s design expectations. This document helps stakeholders understand expectations, reduce uncertainties and improve cost control throughout the project lifecycle. “Cost overruns always come down to early considerations, and having a clear PPR that outlines the scope, level of fit-out, and what you’re trying to achieve is crucial.” says Maoibh.

Managing Costs and Contingency Planning

Material cost increases, labour shortages, and unforeseen site conditions can significantly impact project budgets. A well-prepared budget accounts for these variables by including an adequate contingency. Maoibh highlights the importance of planning for the unexpected: “Contingency is important across the board in every single project. We recommend approximately 5% as a minimum these days, ranging up to 10% for some civil projects where there is more risk in the ground and a lot of unknowns.”

In addition to contingency planning, value engineering services are crucial in managing costs. This process helps identify cost-effective alternatives without compromising quality or design. “As quantity surveyors, we can review designs and give suggestions on where we see potential cost savings due to material selections or more efficient design. For example, using the functional areas of a project, we can advise the client that their project may cost more than expected if it is sitting above the average functional area of comparable projects.” Maoibh explains, “We can advise on average, two-bedroom apartments have this unit area, have this balcony area, and have this basement that allows for this much car space per unit. And if your project is sitting above that average area, then your construction cost is going to be higher than what everyone else is paying for that type of product.”

When looking at residential projects, almost half (44.9%) of new dwellings cost more to build than they were approved. Apartments had the largest changes in the cost of construction, rising by 6.3% between approval and commencement (ABS, 2020). A common misconception is that overloading a project’s budget will prevent cost blowouts. In reality, impractical budgets can make a project financially unviable. If sufficient funds are not available, the project may stall or require drastic changes that affect quality and delivery timelines. Maoibh warns: “You don’t want to have too much fat in your budget because potentially that might make your project not stack up, and then you won’t proceed with it. You want a realistic, considered and accurate budget, not a conservative one that includes unnecessary allowances.“

Reducing Financial Risk

Collaboration between the QS and other project stakeholders is essential to reducing financial risks.

Stakeholders also play a key role by providing documentation, including architectural, services, civil and structural engineering plans. Maoibh stresses the importance of complete documentation: “Complete documentation is key. If there’s poor coordination between consultants, like structural design clashing with the architectural design or services, it can lead to cost overruns. Building Information Modelling and clash detection can save a lot of money by resolving these issues early on.”

Maoibh reflects on a successful project: “A standout example is a Southbank [QLD] project in the early 2000s, where BIM was implemented. By using BIM and clash detection, potential issues were identified and resolved before construction began, resulting in no variations or unexpected cost blowouts.”

How a QS Prevents Cost Overruns

A well-managed construction project relies on strategic cost management throughout its lifecycle. A QS contributes by being involved early to establish a solid financial plan, providing contingency advice to account for unforeseen costs, offering continuous cost management throughout all project phases, and ensuring all necessary project considerations are included in the budget.

Maoibh sums it up: “The role of a quantity surveyor extends beyond just the early stages of a project. By staying involved throughout the design development, we can help keep costs in check and avoid major financial risks later in the project.” By using the expertise of a QS, stakeholders can reduce financial risk, improve budget accuracy, and ultimately deliver a successful project.

IS YOUR PROPERTY PROTECTED?

Understanding the Importance of Replacement Cost Estimates & Insurance

Staying informed about your property’s true replacement cost is a proactive step in protecting your asset. With the ever-changing landscape of construction costs and inflation, regular reviews of your property’s value are essential. Mitchell Brandtman can assist you in navigating this crucial aspect of property ownership, ensuring you’re adequately prepared for whatever the future holds.

Imagine the unimaginable: a fire, flood, or unforeseen disaster damages or completely destroys your property. In such challenging times, knowing that your insurance coverage accurately reflects the current cost to rebuild offers significant peace of mind. This assurance comes from having an up-to-date Replacement Cost Estimate, a service provided by our team at Mitchell Brandtman.

What is a Replacement Cost Estimate?

A Replacement Cost Estimate is a detailed assessment that determines the current expense required to replace an existing asset under today’s market conditions. For property owners, this means calculating the costs necessary to rebuild a home, commercial or industrial building in the event of damage or loss. Our team at MB will assess various factors, such as demolition costs, professional fees, and estimated construction cost, while accounting for potential price surges, to provide an accurate replacement cost value for insurance purposes.

Why is This Service Essential?

Over recent years, construction costs have experienced significant fluctuations. For instance, prices charged by building companies in Australia have increased by 32% over the last 5 years. Additionally, the country’s inflation has increased by an average of 3.7% annually over the past five years, peaking at 7.8% in 2022—the highest in four decades.

These economic shifts directly impact the cost of rebuilding your property, which is likely to be far higher than when you first insured it. Without an updated Replacement Cost Estimate, your insurance may no longer provide full coverage, leaving you financially vulnerable at a time when you need protection the most.

Who Benefits from a Replacement Cost Estimate?

Homeowners and Investors: Ensure insurance policies reflect the true replacement value of properties, safeguarding personal finances and investments.

Developers and Building Owners: Accurate insurance coverage is crucial to mitigating financial risks during and after construction.

Bodies Corporates and Strata Managers: Understanding replacement costs allows for the proper allocation of strata fees.

Why is this Important?

Mitchell Brandtman recognises the importance of timely and accurate Replacement Cost Estimates. Our team offers quick turnarounds and cost-effective services, providing you with a detailed breakdown of current rebuilding costs. This transparency benefits both you and your insurance provider, giving you the confidence that your coverage matches today’s construction market.

Contact us at 1800 808 289 or email us at bne@mitbrand.com

Discover how Mitchell Brandtman managed cost controls and claims validation for the complex Blues Point Tower remediation project. Our strategic approach ensured transparency, kept the project on track, all while meeting budget outcomes.