What is a digital twin?
A digital twin is a digital representation of a real asset that stays in sync with it. The Digital Twin Consortium describes it as a virtual representation of real things and processes, kept in step with them at an agreed frequency and level of detail.
For a building, that means three parts working together:
- The physical asset: the building, its rooms and its equipment.
- The digital model: the as-built BIM model with an asset register for every element.
- The connection: live readings from sensors, meters and the BMS, plus maintenance history, mapped to the right room or machine.
The connection is what makes it a twin. A beautiful 3D model that is not fed with live data is still a model.
Digital twin, BIM and 3D model: what is the difference?
| Type | What it holds | When it is used |
|---|---|---|
| 3D model | Geometry and appearance | Design reviews, marketing |
| BIM model | Geometry plus data for every element | Design, coordination, construction |
| Digital twin | BIM plus live data, history and alerts | Operation, maintenance, planning |
BIM and the twin are not rivals: the twin is built on the BIM model. Our article BIM vs digital twin compares where each one saves money.
How a digital twin works: the data journey
Every reading travels the same path, from a sensor in a plant room to an action by the facilities team. Select a stop to see what happens there.
From sensor to action
Five stops, every few seconds, in every connected building.
1 · Sensors and meters
Temperature, humidity, CO₂, occupancy, power, water and equipment status are measured where they happen: in rooms, ducts, risers and plant rooms. Many buildings already have most of these points; they are just not connected to anything useful.
2 · BMS and gateway
The building management system collects the readings. A gateway reads them over open protocols such as BACnet and Modbus and sends them securely to the twin platform, without replacing the BMS.
3 · Twin platform
The platform places every reading on the right room and asset in the as-built model, stores the history and learns what is normal for each hour, day and season. That baseline is what makes an alert meaningful.
4 · Dashboards and alerts
Operators see the building in 3D with live values, trends and energy use. When a reading drifts from its baseline, the twin raises an alert with the location, the equipment and its history.
5 · Action
The alert becomes a work order in the maintenance system (CMMS), with the asset's manual and warranty attached. The technician fixes the cause before occupants feel it, and the result is recorded back in the twin.
The 5 maturity levels of a building digital twin
A digital twin is not a single product you switch on. It grows in levels, and each level needs the one below it. Most owners start at level 2 and add capability as the data proves its value.
Climb the ladder
Select a level to see what it does, what it needs and an example.
A model you can trust
An accurate as-built BIM model with an asset register for every room and piece of equipment.
- Needs: as-built BIM, COBie or CAFM asset data
- Example: find any air handler, its manual and warranty in seconds
The building, live
Sensor, meter and BMS readings appear on the right room and asset, in real time.
- Needs: BMS access, meters, a gateway
- Example: see temperature, CO₂ and occupancy floor by floor
Alerts with a reason
The twin compares every reading with its normal pattern and raises an alert with the likely cause and location.
- Needs: months of history, alert rules
- Example: a chiller drifting from its baseline flagged before a comfort complaint
Seeing ahead
History and patterns forecast failures, energy peaks and maintenance needs, so work is planned instead of reactive.
- Needs: long baselines, maintenance records
- Example: a pump scheduled for service before its vibration trend crosses a limit
Decisions, tested first
The twin recommends actions or runs what-if scenarios: a new setpoint, an event, a refurbishment, before anything changes on site.
- Needs: levels 1 to 4, agreed control rules
- Example: testing a cooling strategy for a large event before the doors open
See it in action: a live twin simulator
Drag through a working day in a four-floor office in Riyadh. Switch between layers and watch the twin react. In the afternoon, an air handler on floor 3 starts to drift. The twin catches it because it knows what that floor normally looks like at that hour.
Live twin simulator
Move the time slider and select a layer.
Showing 10:00
Illustrative data for explanation only. It is not a reading from a real building.
What a digital twin does for a building owner
- Cuts energy waste. Cooling is the largest load in most Saudi buildings. The twin shows where energy is used against occupancy, floor by floor, so waste is visible and fixable.
- Moves maintenance from reactive to planned. Alerts against baselines and trend forecasts catch failing equipment early, when the repair is small.
- Protects comfort and reputation. Problems are fixed before guests, patients or tenants feel them.
- Keeps handover data alive. The asset information delivered at handover stays accurate because operations keep updating it, as ISO 19650-3 intends.
- Improves capital planning. Replacement and refurbishment decisions are based on the real condition and history of each asset.
- Supports safety and ESG reporting. Air quality, energy and incidents are measured continuously instead of sampled once a year.
Where digital twins pay back in Saudi Arabia
The value is highest where heat, uptime and crowds put pressure on building systems. Select a sector.
Resorts and hotels
Guest comfort is the brand. A twin tracks room conditions, cooling plant and water across a resort, so a failing unit is replaced before a guest calls reception. On remote Red Sea destinations, it also helps a small on-site team run a large estate.
Hospitals and clinics
Critical rooms need stable pressure, temperature and air quality around the clock. The twin monitors them continuously and gives engineers the history of every asset when an audit or incident review needs it.
Government and public buildings
Large public portfolios need one reliable asset register. A twin built on ISO 19650 handover data keeps that register current and makes maintenance spend visible across many buildings.
Mixed-use and commercial towers
Offices, homes and retail share one plant. The twin separates energy use by zone and tenant, balances comfort between floors and supports fair service-charge reporting.
The Holy Sites and large venues
Occupancy can multiply within hours. A twin that sees crowd levels, cooling load and air quality together lets operators prepare systems before the peak, not after it. TwinMs is deployed on the Haram Project in Makkah.
Heritage buildings
A twin built on a laser-scanned heritage BIM model tracks humidity, temperature and movement in historic fabric, so conservation teams act on evidence instead of periodic inspections.
A building's life, with and without a twin
- HandoverBoxes of drawings and PDFs. Much of the asset data is out of date within months.A verified as-built model and asset register, connected to the live building from day one.
- Year 1Faults are found when occupants complain.Baselines form, and the first drifts are caught before anyone notices.
- Year 5Maintenance follows the calendar, whatever the equipment's real condition.Maintenance follows condition and trend, and spend goes where it is needed.
- Year 15The refurbishment starts with a new survey, because nobody trusts the records.The refurbishment is planned on the twin, with the full history of every system.
- Year 25+Knowledge has left with the people who held it.The building's knowledge stays with the building.
How to start a digital twin, in 6 steps
- Define the outcomes. Choose the two or three results that matter most, such as energy, uptime or comfort, and write them into your information requirements under ISO 19650-3.
- Secure the as-built data. Use the as-built BIM model and a COBie asset register. For an existing building without reliable drawings, start with scan to BIM.
- Audit systems and connectivity. List the BMS, meters and protocols already in place. Most buildings need far fewer new sensors than owners expect.
- Pilot one building or one system. Prove the value on a contained scope, such as the cooling plant or one tower, and measure it.
- Connect operations. Link alerts to the maintenance system and give technicians the twin on their phones, so insight turns into action.
- Scale and govern. Agree data ownership, security and KPIs, then extend to more systems and buildings. ISO 19650-5 guides the security side.
For new projects, the cheapest moment to prepare a twin is at the start: ask for twin-ready handover data in the tender, not after construction. See how we run operation and maintenance on the BIM lifecycle.
Digital twins at Design Zone
TwinMs is the digital twin platform built by Design Zone in Saudi Arabia. It launched commercially in 2024 on the Haram Project in Makkah and at Dar Albadriyah in Riyadh, where it runs live today.
216
Sensor channels at Dar Albadriyah: HVAC, energy, water, indoor air quality and occupancy, updated every ten seconds.
730 days
Of baseline history behind every alert, so the twin knows what normal looks like for each hour and season.
BACnet · Modbus
The BMS and CMMS connected over open protocols, with FM and technician apps on iOS and Android.
Every twin we deliver is proven first on our own building: the Design Zone HQ digital twin in Jeddah links the as-built model with asset data in Autodesk Tandem.
Is your building ready for a digital twin?
Answer six questions to see where your building stands and the best first step.
Digital twin readiness check
Six questions, under a minute. Nothing is sent until you choose to contact us.
Answer all six to see your result.
Five common mistakes
- Treating the twin as a 3D visual. The value is in the live data and the actions it triggers, not in the rendering.
- Starting without as-built data. A twin built on design-stage models shows the building that was drawn, not the one that was built.
- Buying a platform before defining outcomes. Choose the problem first, then the technology.
- Leaving data without an owner. Someone must be responsible for keeping the asset register and model current.
- Ignoring security. A connected building is part of your IT estate. Plan access, hosting and data residency from day one.
Glossary
- Digital twin
- A digital representation of a real asset, kept in sync with it through live data.
- As-built model
- A BIM model that matches the building as it was actually built, not as it was designed.
- BIM
- Building Information Modelling: a 3D model in which every element carries data.
- Asset Information Model (AIM)
- The ISO 19650 term for the information that supports operating a built asset.
- COBie
- A standard format for handing over asset data: spaces, systems, equipment and warranties.
- CAFM
- Computer-aided facility management: software for space, assets and services.
- CMMS
- Computerised maintenance management system: where work orders are raised and closed.
- BMS
- Building management system: controls and monitors HVAC, lighting and other services.
- BACnet and Modbus
- Open communication protocols that let building systems share data with a twin.
- Baseline
- The normal pattern of a reading for a given hour, day and season, learned from history.
- Anomaly detection
- Spotting a reading that drifts away from its baseline, before it becomes a failure.
- Predictive maintenance
- Servicing equipment based on its condition and trend instead of a fixed calendar.
Questions and answers
What is a digital twin in construction?
It is a live digital copy of a building or infrastructure asset: the as-built BIM model connected to real data from sensors, the BMS and maintenance records. It is used to operate, maintain and plan the asset.
Is a digital twin the same as BIM?
No. BIM is the data-rich model used to design and build the asset. A digital twin uses that model as its base and adds live data, history and alerts to run the asset in operation.
Can an existing building have a digital twin?
Yes. If drawings are missing or out of date, the building is laser-scanned and modelled with scan to BIM, then connected to its BMS and meters.
What does a digital twin need to work?
An accurate as-built model, an asset register, access to live data from the BMS, meters or sensors, and a clear owner for the data. Clear outcomes come first.
Which standards apply to digital twins of buildings?
ISO 19650-3 covers managing information in the operational phase, and ISO 19650-5 covers security. ISO 23247 sets out a digital twin framework for manufacturing, and the UK Gemini Principles describe good practice for national digital twins.
Do we need to replace our BMS?
Usually not. A gateway reads data from the existing BMS over open protocols such as BACnet or Modbus. The twin sits on top of the BMS; it does not replace it.
Where is the data hosted?
It depends on the platform. TwinMs, built by Design Zone in Saudi Arabia, is hosted on Saudi infrastructure so operational data stays in the Kingdom.
How do we start?
Define two or three outcomes, check the as-built data and systems, then pilot one building or system. The readiness check above shows which step to take first.
Sources and further reading
- Digital Twin Consortium, The Definition of a Digital Twin.
- ISO 19650-3:2020, Information management using BIM, operational phase of assets.
- ISO 23247-1:2021, Digital twin framework for manufacturing, overview and general principles.
- Centre for Digital Built Britain, The Gemini Principles (2018).
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