Simulate construction
before you build.
Our software lets you run and control complex construction processes virtually, long before the first machine reaches site.
Pick your starting point:
We simulate construction processes – true to life
What we are
- Specialists in parametric construction process simulation.
- The missing link between BIM model, cost estimate and the real construction site: a fully calculated construction process.
- A partner for planning and execution decisions backed by real productivity data.
What we are not
- Not another BIM or CAD tool.
- Not a replacement for your planning — we build on it and give you a better basis to decide.
- Not a black box: every construction process stays traceable.
Why construction projects overrun their budgets
Change orders, delays and disputes are the consequences. The causes arise earlier: in planning that does not think the construction sequence through all the way to the site. That is where we come in.
That is how far major European transport projects are over their planned costs on average, based on current estimates. Many will finish years late.
European Court of Auditors, Special report 02/2026
Planned too roughly
Major projects are often not planned in enough detail before construction starts. For public building projects in Hamburg, around 80 % of cost increases arose during the planning phase.
German Reform Commission on Major Projects, 2015 · Hamburg State Audit Office, 2010
Partial plans that don’t fit together
Many parties each plan their own part. Without coordination, the result is incompatible partial plans that only collide on site.
German Reform Commission on Major Projects, 2015
Planning and execution talk past each other
More than 85 % of planners and project managers and more than 70 % of contractors see the lack of exchange between planning and execution as a cause of inefficient construction sequences.
Survey by Uhl/Höppner, 2010
Proven on demanding projects
Our solutions have proven themselves with owners, developers, planners and contractors alike, from rail junctions under live traffic to major tunnel works. They hold up in day-to-day project work.
“Gaming meets construction. With dProB, BII GmbH has managed to make our experts’ knowledge of construction processes tangible in a playful, virtual way. A disruptive approach with the potential to simplify a great deal.”
“Thanks to dProB we can now plan construction processes more efficiently. The software helps us minimize risks and optimize processes, which noticeably reduces disruption on site. The dynamic simulations let my team work better with our clients and complete our projects more successfully.”
“With dProB we can reduce the disruption our customers experience from construction sites and simulate construction processes in detail. That avoids risks and lets us optimize processes together with our construction partners.”
“Following a successful 100-day proof of concept and a follow-up program with the DB Mindbox, we have now used dProB across various projects and project phases. For validating and optimizing track possessions, construction processes, site setup, logistics planning and much more, we see it as a logical next step toward digitalizing our planning right through into construction.”
“Until now, BIM has focused on the initial state and the finished end state, but not on the question of which construction processes take us from state A to state B. dProB lets us answer that question. We are extending the world of static clashes between BIM models to dynamic clashes in the construction process — an interaction of construction equipment with BIM models.”
“At last the model starts to move — whether for designing site logistics or verifying possessions for bridge insertions. With dProB from BII, any construction process can be built up to whatever level of detail you need. For me it is a tool both for capturing knowledge and for properly verifying planning before execution.”
“Virtual construction process planning is the missing key to implementing a complete digital workflow across a company. The gaming industry knows how to plan virtual processes intuitively in changing environments and make them comprehensible to everyone through graphics.”
“Simulating complex worlds has been possible in the gaming industry for some time, but with dProB the tools for it are now available to the construction industry as well. In our project we were able to simulate and validate complex processes, from site logistics through to erecting individual structures, and make them tangible for everyone involved. dProB turns static IFC models into something dynamic and into a genuinely shared planning basis.”
The more complex the project,
the more it pays to simulate
An animation only shows. A simulation calculates. Working from real project and site data, you can run the construction process along the timeline, catch conflicts early and compare scenarios before they get expensive on site. Where many factors meet, every assumption turns into a risk. Typical drivers where a well-founded decision pays for itself:
Three routes to more certainty
dProB
Construction process simulation for complex projects — instantly understandable, and faster to approve.
Explore the software →
Process Engineering
Experience meets technology. Our process engineers work out robust construction processes with you.
Discuss your project →
Construction Management
Site management at the next level, with digital control room solutions. More transparency while you build.
See the control room →Where BIM stops today, we begin.
Since 2018 we have set the standard in construction process simulation: our team pairs top-tier software engineering with hands-on experience from the construction industry and turns both into solutions that measurably save time and money on real projects. A renewed framework agreement with Deutsche Bahn is striking confirmation of that pioneering role.
From the blog
Why plans fail on site and what helps
BII GmbH offers four services: the dProB simulation software for 4D construction process simulation, process engineering as a hands-on consulting service, individually developed construction management solutions for site coordination, and simbox, AI-assisted 4D simulation software that is coming soon. You run dProB in-house yourself; with process engineering the process engineers at BII GmbH carry out the simulation for you.
dProB is an input-based simulation software by BII GmbH that runs the construction process through as a 4D simulation before anyone builds anything. dProB links your imported BIM model with schedules, resources and the output rates of your equipment, and makes spatial and temporal dependencies visible in the model. That way you spot conflicts and bottlenecks yourself before they get expensive on site. dProB is a Windows desktop application and runs locally on your machine.
No. dProB does not replace CAD, BIM or scheduling software, it complements them. dProB is explicitly not a modeling tool: imported IFC and FBX models are visualized and can only be edited to a limited degree. Nor does dProB replace conventional schedules. You import BIM data, use it to validate planning assumptions and construction processes, and feed the results back into your digital workflow — your planning stays where it is.
The easiest route is a short demo: you describe your project, we show you dProB on a construction process close to your own. Get in touch via the contact form, by email to contact@bii-gmbh.com or by phone on +49 7351 5379993 — we respond within one working day. Whether the software or the consulting service is the better fit is something we work out together.
Make your decisions before the site makes them for you.
Tell us briefly about your project — we will get back to you personally within one working day.
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