Brisbane’s Treasury Building: Engineering a Modern Campus Within a Heritage Masterpiece

It is not every day you get to work on a building that spans an entire CBD block. It is even rarer when that building is a magnificent Italian Renaissance masterpiece that has stood as a gateway to a city for well over a century.

Brisbane’s heritage-listed Treasury Building – bordered by Queen, William, George, and Elizabeth streets – is currently undergoing one of its most significant chapters yet. Designed by the renowned Queensland Colonial Architect John James Clark and built in three stages between 1886 and 1928, this landmark is being transformed from its recent life as the Conrad Treasury Casino (1995–2024) into a vibrant new city campus for Griffith University (GU).

At n2 Engineering Consultants, we are proud to be consulting on the hydraulic services design for this extraordinary transformation. Working on a site with a history dating back to 1825 (when it was originally reserved for convict-built military barracks) is an incredible privilege, but it also comes with some of the most technical building services challenges we have ever encountered.

Here is a look behind the heritage facade at how we are helping to bring this historic icon into the future.

The Challenge: High-Spec Services with Zero Footprint

Modern university campuses require top-tier hydraulic, ventilation, and power systems. However, when the building in question is a heavily protected heritage site, you cannot simply core-drill a new pipe run or bolt heavy brackets wherever you please.

Our engineering work on the Treasury Building has required us to solve several unique heritage and operational puzzles:

1. Minimising the Impact on Heritage Fabric

The building’s famous facade, roofline, and internal structural elements are under strict conservation guidelines. Any new pipework, brackets, support structures, or penetrations must be designed with extreme care. Our goal is to minimise the impact on the existing building fabric to the absolute greatest extent possible. Every single connection point has to be engineered to distribute loads safely without damaging historical stonework.

2. The Surgical Demolition and Reuse of Hydraulics

Rather than pulling everything out and starting fresh, the sustainability and structural constraints of this project require us to reuse as much of the existing hydraulic infrastructure as we can.

This has meant getting our hands dirty with detailed, on-site forensic investigations. We have had to trace and verify the actual condition and routing of century-old pipework hidden deep within the structure. From there, we developed a staged implementation strategy that maximises the retention of the existing infrastructure while ensuring it can handle the demands of a high-traffic university campus.

3. Managing High-Stakes Live Operations

Because this site is transitioning in stages and borders active high-density commercial areas, we have had to design highly coordinated temporary drainage arrangements.

This is crucial to prevent any risk of sewer surcharge, backflow, or service interruptions during the construction phase. We have undertaken a thorough assessment of the existing main drainage network’s capacity and flow characteristics to ensure the transition from the old casino layout to the new university campus runs completely smoothly.

4. The Battle for Void Space

The Treasury Building’s grand, historic ceilings are protected elements, which means they cannot be altered. The space inside the ceiling voids is highly restricted. This has required our BIM and engineering teams to work in lockstep, coordinating our hydraulic systems with mechanical, electrical, and fire services down to the millimetre.

5. Exceeding the Standards for Griffith University

While minimum code compliance is always our baseline, Griffith University has its own strict guidelines, operational preferences, and performance expectations. Our design team has worked hard to ensure that every drop of water, drainage run, and fixture does not just pass local building codes, but aligns perfectly with GU’s vision for a resilient, low-maintenance, and highly efficient city campus.

Engineering the Future, Respecting the Past

The Treasury Building transformation is currently in progress, and the n2 team is fully focused on delivering a world-class educational space that respects Brisbane’s rich history.

This project is a perfect example of the n2 difference: we do not just rely on standard templates. We get on-site, trace the pipes, understand the heritage, and design custom solutions that protect the building’s character while preparing it for thousands of future students.

Keep an eye out for more updates as this landmark project progresses.

Want to learn more about our experience with heritage retrofits and complex commercial designs? Reach out to the n2 team today.

Maximising Building Efficiency: Energy Recovery through Integrated Mechanical and Hydraulic Design

In nature, nothing is ever truly wasted. Think about the simple relationship between humans and trees: we breathe out carbon dioxide, which trees “inhale” to grow. In return, they release the oxygen we need to survive. It’s a perfect, symbiotic loop where one’s waste becomes the other’s lifeblood.

At N2, we’ve been asking ourselves a simple question: Why can’t our buildings work the same way?

Typically, the different “organs” of a building (like the mechanical (HVAC) and hydraulic systems) operate in silos. This often leads to a massive waste of energy that we actually pay to get rid of. Today, we’re looking at how n2 is breaking those silos down to create a smarter, greener “breathing” building.

The Problem: Paying to Throw Away Energy

Most large-scale mechanical systems generate an incredible amount of waste heat. Usually, this heat is seen as a nuisance; it has to be treated and exhausted out of the building, which requires extra equipment and, predictably, extra costs.

At the same time, the hydraulic system is working hard to generate hot water. Modern heat pumps are great because they pull “free” heat from the surrounding air to warm your water. But what if the air around them was already pre-heated by the building itself?

The n2 Solution: Closing the Loop

Our team has developed an integrated design that captures that “waste” heat from the mechanical side and feeds it directly into the hydraulic heat pump system.

It’s engineering upcycling at its finest. Depending on the building, we do this in two ways:

1. For Air-Cooled Systems: We consolidate the units within a shared plant room. The mechanical units release their heat, and the hydraulic heat pumps sit right there, ready to soak it up.
2. For Water-Cooled Systems: We use heat exchangers to physically transfer that warmth from the mechanical water loop to the hydraulic one.

The result? The mechanical system doesn’t have to work as hard (or spend as much) to get rid of its heat, and the hydraulic system gets a free boost of energy.

Engineering Earth Warriors

This isn’t just about saving a few dollars on a utility bill (though it certainly does that). It’s about n2’s commitment to being greener, seeking solutions for the betterment of our community, but also mother Earth. We believe that the greenest energy is the energy you’ve already generated. By repurposing waste heat, we’re reducing the overall carbon footprint of the building and proving that sustainability and efficiency can – and should – go hand in hand.

“True innovation isn’t always about inventing a brand-new machine; sometimes, it’s just about making two existing machines talk to each other,” says Nathan Fu, Managing Director at N2. “By looking at a building as a single, living organism rather than a collection of separate parts, we can find these hidden efficiencies. It’s about thinking outside the box to ensure our designs are as kind to the planet as they are to our clients’ budgets.”

The Future is Integrated

At n2, we’re proud to be frontrunners in this kind of integrated thinking. We don’t just want to meet the standard; we want to set a new one. If we can make a building “breathe” as efficiently as a forest, we’re doing our job right.

Want to see how an integrated design can breathe new life into your next project?

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Under Pressure: Why Your Building’s Pipes Might Be a Ticking Time Bomb

We’ve all heard the old saying that “bigger is better.” In building services, that usually translates to more capacity, more power, and more pressure. But in hydraulic engineering, “more” isn’t always your friend. In fact, an over-pressurised system is often a silent liability – one that’s just waiting to make a very loud (and very expensive!) entrance.

Over the years, the team here at n2 has been called in to investigate several nasty property damage cases across Sydney. We’re talking about serious water ingress caused by Pressure Reducing Valve (PRV) failures. When we looked into the “why” behind these leaks, we found a frustratingly common pattern: much of the damage could have been avoided entirely if the system hadn’t been pushed so hard at the source.

The Problem with the “Mechanical Band-Aid”

Think of PRVs as the bouncers of your building’s water system. Their job is simple: catch high-pressured flows and drop that pressure down to a safe level for your taps, showers, and appliances.

But there’s a catch. PRVs are mechanical. They’re made of moving parts, diaphragms, seals, and springs that live their lives under constant, high-intensity stress. When you put them in high-pressure environments, the physics of water (things like cavitation and turbulence) starts to eat away at those components. They get tired. Seals degrade, and eventually, they leak.

These aren’t set and forget gadgets. They need a strict maintenance schedule to stay useful. A PRV failure is often a “quiet quitter”; when the diaphragm and seat or disc wear out, or a spring fails, high-pressure water can bypass the PRV entirely. This sends a surge downstream that damages fixtures and can lead to significant flooding before anyone even notices there’s a problem.

The n2 Insight: Designing Out the Risk

When we investigate a leak, we don’t just look at the broken valve; we look at the original design. Often, we find that a building is relying far too much on these secondary PRVs to fix a system that was just given too much pressure from the start. We see pumps that are oversized for worst-case scenarios that never actually happen, leaving the system to run at dangerously high levels every single day.

If the pressure is balanced and specified correctly at the start – whether it’s coming from the town mains or a booster pump – you can actually get rid of many of these sub-station PRVs. By fixing the pressure at the root, you remove dozens of potential fail-points.

Why over-pressurising costs you more:

1. High Upfront Costs: You’re paying for “gold-plated” gear you don’t need. This includes heavier-duty pumps, high-pressure rated pipes, and specialised fittings just to handle the extra load.
2. A Never-Ending Maintenance List: Every PRV you add is another line item on your yearly budget. In high-rise buildings, these need constant testing and part replacements. Smart design cuts that ongoing cost right down.
3. A Bigger Mess When Things Go Wrong: High pressure puts 24/7 strain on every joint and flexible hose in the building. A small leak that might be a nuisance at low pressure becomes a catastrophic flood when the system is pushed to its limit.

A Word from Nathan Fu

“Good engineering isn’t about adding more parts to solve a problem; it’s about having the fewest moving parts possible,” says Nathan Fu, Managing Director at n2.

“True reliability comes from looking at the pressure itself, rather than just installing band-aids. We’ve seen the mess that happens when a design relies too heavily on hardware that eventually wears out. Often, the most reliable valve is the one you never had to install because the system was balanced correctly from day one.”

Reliability Through Simplicity

At n2, we live by a simple rule: “Do it once and do it well.” We spend the time upfront during the design phase to make sure system pressures are optimised for real-world use, not just maxed out for the sake of it. This “source-first” approach helps our clients cut their long-term risk before a single pipe is even laid.

We don’t just want a system that works on day one; we want a building that stays quiet and dry for the next twenty years.

Concerned about the pressure levels in your current project?

Get in touch with the n2 team for a technical review. Let’s design out the risk before it becomes a liability.