I sat in a strata committee meeting last month in Hurstville where the building manager pulled up a 3D model of the entire complex on his laptop. Every pipe, every electrical conduit, every HVAC unit — mapped and monitored in real time. A water sensor on level three had flagged an anomaly twelve hours earlier. They’d already dispatched a plumber before anyone noticed a leak.

That’s a digital twin. And it’s coming to more Sydney apartment buildings than you’d think.

What Exactly Is a Digital Twin?

A digital twin is a virtual replica of a physical building, connected to real-time sensor data. Think of it as a living 3D model that knows what’s happening inside the walls. Temperature. Humidity. Water flow. Energy consumption. Structural movement. Air quality.

The concept started in manufacturing and aerospace — companies like Siemens and GE have used digital twins for decades to monitor complex machinery. But the cost of sensors has dropped roughly 80% since 2020, and the computing power needed to run these models is now available through standard cloud services. That’s brought the technology within reach of commercial and residential property.

In Australia, companies like Willow (founded by former Lendlease executive Josh Ridley) have been building digital twins for major commercial developments for several years. What’s changed in 2026 is that the technology is filtering down to the residential strata market — buildings of 50-200 apartments, not just billion-dollar office towers.

Why This Matters for Property Values

Here’s where it gets interesting for anyone in real estate. A building with a well-maintained digital twin has a fundamentally different risk profile to one without.

Maintenance shifts from reactive to predictive. Instead of waiting for the hot water system to fail on a Friday night, the digital twin flags degraded performance weeks in advance. Planned maintenance is cheaper than emergency repairs — typically 40-60% cheaper, according to data from FM Global.

Insurance premiums respond. Insurers are starting to recognise that buildings with comprehensive monitoring systems present lower risk. I’ve spoken to two strata insurance brokers in Sydney who confirm they’re seeing early-stage premium adjustments for buildings with real-time water leak detection and fire monitoring systems. The discounts are modest so far — 5-10% — but the direction is clear.

Capital works planning improves dramatically. One of the biggest headaches in strata is the ten-year capital works plan. How much do you set aside for waterproofing? When will the lifts need a major overhaul? With sensor data feeding a digital twin, these become data-driven decisions rather than educated guesses from a building inspector who visited once.

Buyer due diligence gets sharper. When I’m advising buyers on apartment purchases, the quality of building maintenance records is a major factor. A digital twin provides an objective, real-time view of building health that’s far more reliable than a strata manager’s annual report.

The Cost Question

This is where most strata committees hit the brakes. Retrofitting an existing building with the sensor infrastructure needed for a basic digital twin isn’t cheap.

For a mid-rise apartment building (60-80 units) in Sydney, you’re looking at $150,000-$300,000 for initial sensor installation, platform setup, and commissioning. That’s roughly $2,000-$4,000 per lot as a special levy. Ongoing platform and monitoring costs run $20,000-$40,000 per year, or $250-$500 per lot annually.

That’s a meaningful expense. But compare it to a single major water damage event — which can easily run $500,000+ in a mid-rise building — and the economics start to make sense.

New builds are in a different position entirely. Developers who include digital twin infrastructure from the outset add roughly 1-2% to construction costs. Several projects currently under construction in Sydney’s Green Square and Zetland are incorporating this from day one.

I’ve been discussing with Team400 how AI-driven analytics layered on top of digital twin data could give agents far more accurate property assessments. The potential for automated building health scores that feed directly into valuation models is significant, and it’s closer to reality than most people in the industry realise.

What Agents Should Be Doing Now

If you’re listing apartments in buildings with digital twin systems, mention it. It’s a genuine differentiator that informed buyers will care about. It belongs in the same conversation as building age, recent remediation work, and sinking fund balance.

If you’re advising buyers, start asking about building monitoring systems during due diligence. The presence or absence of smart building technology is increasingly relevant to long-term ownership costs.

And if you’re on a strata committee yourself — as I am in two buildings — put digital twin technology on the agenda. It doesn’t have to happen this year, but it should be part of your five-year planning.

The buildings that adopt this technology early will have a measurable advantage in maintenance costs, insurance premiums, and ultimately resale values. The buildings that don’t will look increasingly dated.

This isn’t speculative futurism. It’s happening in Sydney right now. The question is whether your building — or the buildings you sell — will be part of it.

Linda Powers is a Sydney-based real estate technology analyst and licensed agent with 25 years of industry experience.