The short answer
BIM stands for Building Information Modeling. It means creating a detailed, intelligent 3D model of a building on a computer, and using that model to plan, check, build and later run the real building. The model is not a picture. Every wall, beam, duct and window in it is an object that knows what it is, how big it is and what it is made of.
Think of it as a virtual construction site
The easiest way to picture BIM is as a construction site that exists only on a computer. The architect, the structural engineer and the services engineer all put their parts into the same virtual building. Problems that would normally appear months later on the real site, such as a pipe that will not fit past a beam, appear on screen first, when fixing them costs a few minutes instead of a few weeks.
What is inside a BIM model
- Geometry: the shape and position of every element, in 3D.
- Information: each element carries data such as material, size, fire rating, manufacturer and cost.
- Relationships: walls belong to levels, doors sit in walls, ducts connect to equipment, so a change in one place updates the rest.
- Quantities: because everything is an object, the model can count and measure itself, giving lists of materials without anyone adding them up by hand.
- Place: the model sits in real-world coordinates, so separate models line up exactly.
How is that different from drawings?
A set of drawings is a collection of separate pictures that people have to keep consistent by hand. A BIM model is one source from which the plans, sections, elevations and schedules are all generated, so they cannot disagree with each other. See our comparison of BIM and CAD for the detail.
Who uses BIM, and what do they get?
| Who | What BIM gives them |
|---|---|
| Owners and developers | Fewer surprises, a clearer view of the design before they pay for it, and a model to run the building with afterwards. |
| Architects | Consistent drawings, faster design changes and better coordination with engineers. |
| Engineers | A shared model to design against, and early warning of conflicts. |
| Contractors | Accurate quantities, a coordinated plan for site, and fewer reworks. |
| Facility managers | A record of what is installed and where, for maintenance. |
A few words you will hear
- LOD (Level of Development): how detailed and reliable each element in the model is. Read our LOD guide.
- Clash: two things in the same place, like a duct passing through a beam. Read our clash detection guide.
- Revit: the most widely used software for making BIM models. Navisworks: software for combining models and checking them.
- IFC: an open file format that lets different BIM programs exchange models.
- Federated model: separate models from each trade, combined into one for checking.
Where to start
If you have drawings and need a model, send them to us with the services you need and the level of detail required. We reply with a scoped quote. Tell us if you need an NDA first.
Quick questions
Is BIM only for large buildings?
No. Large and complex buildings gain the most, but small projects benefit too, especially renovations where the existing building has to be measured accurately.
Does BIM replace the architect?
No. BIM is a method and a set of tools. The design is still done by the design team; BIM makes it easier to check and build.
Published 14 October 2026 · Written by the Sactik team