BIM Law 2027: Obligations, CDE, IFC 4.3, Information Containers

From January 1, 2027, the rules for preparing and implementing public construction contracts in the Czech Republic are fundamentally changing. Act No. 283/2021 Coll. (the new Building Act), together with the BIM decree, introduces the obligation to use the BIM method – Building Information Modeling – for above-threshold public construction contracts. This article explains in detail what this means in practice, who is primarily affected, and how to prepare.

What is the BIM law and why was it created

The BIM (Building Information Modeling) method represents a fundamental change in how buildings are designed, constructed, and managed. Instead of traditional 2D drawings and fragmented documents, all project participants work with a single shared digital model that contains not only geometry but also metadata – information about materials, lifespan, maintenance, costs, and other parameters.

The Czech Republic follows a trend already running in several European countries. EU Directive 2014/24/EU on public procurement recommends that member states require BIM for public construction projects. Scandinavian countries, the United Kingdom, Germany, and Austria already mandate BIM. The Czech Republic is now joining them.

The goal of the law is not just "digitization for digitization's sake." It's about measurable benefits: reducing construction costs (studies show savings of 10–20%), fewer errors during construction, better management and maintenance of buildings after completion, transparent handling of public funds, and higher quality project documentation.

Who is affected by the BIM obligation from 2027

It's important to precisely define who the obligation applies to. From January 1, 2027, the BIM method must be used by public contracting authorities (the state, regions, municipalities, contributory organizations, state enterprises) for above-threshold public construction contracts. An above-threshold construction contract in 2025 means an estimated value above CZK 137,366,000 excluding VAT (the limit is regularly updated).

In practice, this means BIM will be mandatory for: construction of new public buildings (schools, hospitals, government offices), major renovations of public buildings, transport infrastructure (roads, bridges, tunnels), and other construction projects funded from public sources.

The obligation does not yet apply to the private sector, but experience from abroad shows that BIM spreads rapidly into private projects as well – mainly due to advantages in data quality, coordination, and cost savings.

What is CDE – Common Data Environment

One of the key terms of the new legislation is CDE (Common Data Environment). CDE is a central platform where all construction information is stored, shared, and managed. It's not just file storage, but a structured system with controlled access, versioning, and workflow.

CDE ensures that all project participants work with current data. There are no situations where a designer works with a different model version than a structural engineer, or where an investor has no overview of documentation status.

CDE requirements according to the Czech decree include: role-based access control (who sees and edits what), document version and revision management, change traceability (audit trail), support for standard formats (IFC, PDF, XLSX), workflow for approval and commenting, and data security (encryption, backup, GDPR).

There are many CDE platforms on the market – from large solutions (Autodesk Construction Cloud, Trimble Connect, Oracle Aconex) to medium and smaller tools. The CDE choice should match the project size and company processes.

IFC 4.3 format – the universal language of BIM

IFC (Industry Foundation Classes) is an open data standard for exchanging BIM data between different software tools. While proprietary formats (e.g., .rvt for Autodesk Revit) work only in one program, IFC enables model sharing across platforms.

The BIM decree establishes IFC as the reference format for handing over building information models. Specifically, the IFC 4.3 standard (ISO 16739-1:2024) is required, which compared to older versions brings: expanded support for infrastructure works (roads, railways, bridges), better modeling of building technical equipment (MEP), more precise definition of properties and classifications, improved geometric representation, and compatibility with other ISO standards (ISO 19650 series).

For designers, this practically means that a model created in any BIM software (Revit, ArchiCAD, Allplan, Tekla, etc.) must be exportable to IFC 4.3 in the required quality. This requires correct export settings, parameter mapping, and quality control of the output file.

IFC export quality is one of the biggest practical problems. Poor export can lead to data loss, incorrect geometry, or unreadable parameters. That's why it's important to validate IFC files – manually or using automated tools.

What are information containers

The term information container comes from ISO 19650 and refers to any named and identifiable collection of information managed within a project. An information container can be: a BIM model (IFC file), drawing documentation (PDF), a bill of quantities spreadsheet (XLSX), a technical report (DOCX), photo documentation, or a 3D scan (point cloud).

Each container has a defined identification (coding), status (in progress, for approval, approved, archived), responsible person, and version. The information container system ensures clear data structure in the project, that no document is "lost", and that it's possible to trace who created or changed what and when.

For building managers and facility managers, information containers are key because they define what information must be handed over to the operator upon construction completion. The Asset Information Model (AIM) – the model for asset management – is created precisely from these containers.

BIM Execution Plan – the foundation of a successful project

Every BIM project requires a BIM Execution Plan (BEP). The BEP defines: what information will be created and at what level of detail (LOD/LOI), what software tools will be used, how coordination between disciplines will proceed, what milestones and handover deadlines apply, what coding and naming conventions apply, and who is responsible for individual model parts.

The BEP is a living document updated throughout the project. Without a quality BEP, a BIM project can easily collapse into chaos – everyone models differently, data doesn't match, and the resulting model is unusable.

The client (investor) should require a BEP as part of the tender and evaluate the quality of the proposed BIM approach. For contractors (designers, builders), the BEP is a binding document they work by.

How to prepare for the BIM obligation

BIM preparation is not a one-month matter. It requires a systematic approach. For public contracting authorities, this means: defining BIM requirements in tender documentation (EIR – Employer's Information Requirements), selecting and implementing a CDE platform, training relevant staff, establishing processes for accepting and checking BIM data, and preparing internal guidelines for working with the information model.

For designers and contractors, it's key to: choose suitable BIM software and ensure team competencies, learn to export correctly to IFC 4.3, master working in a CDE environment, understand LOD/LOI requirements in individual phases, and invest in education and pilot projects.

For building managers and facility managers, an opportunity opens up: obtaining a digital building model (digital twin) as a basis for management, using BIM data for maintenance and repair planning, connecting BIM data with CAFM/CMMS systems, and reducing operating costs through more accurate information.

Practical impacts and challenges

Introducing mandatory BIM also brings a number of challenges. The shortage of qualified BIM specialists is one of the biggest market problems. High software and hardware costs, especially for smaller firms, can be a barrier. Resistance to change in the conservative construction industry is a reality. IFC export quality still isn't perfect and requires manual checking. Missing Czech data templates and classifications complicate standardization.

On the other hand, companies that master BIM earlier will gain a competitive advantage. Public contracts with mandatory BIM will grow, and the ability to deliver quality BIM outputs will become a key criterion in supplier selection.

Frequently Asked Questions (FAQ)

Is BIM mandatory for all buildings from 2027?

No. The obligation applies only to above-threshold public construction contracts. Private projects have no obligation, but using BIM is recommended for its quality and efficiency benefits.

Do I have to switch to new software as a designer?

Not necessarily. Most common BIM tools (Revit, ArchiCAD, Allplan) support IFC 4.3 export. The key is learning to export correctly and validate the output.

What if I deliver a poor IFC file?

Poor IFC export can lead to the client rejecting the documentation and requesting rework. That's why it's important to validate IFC before submission.

How much does BIM implementation cost?

Costs depend on company size and current state. For a small design office, they range in hundreds of thousands CZK (software, training, pilot project). For large organizations, they can reach millions of CZK.

Can I as a municipality commission a BIM contract now?

Yes. The law doesn't prevent voluntary use of BIM even before the mandatory date. Several municipalities and regions are already using BIM on a pilot basis.

Where can I find Czech BIM standards and templates?

The BIM implementation concept in the Czech Republic is managed by the Czech Agency for Standardization (ČAS). Methodologies, data standard templates, and other materials are available at koncepcebim.cz.

What is LOD and LOI?

LOD (Level of Development) defines the graphical detail of the model – how precisely elements are modeled. LOI (Level of Information) defines the information detail – what parameters and data are assigned to each element. Both are specified in the BEP for each project phase.

Summary

The BIM law from January 1, 2027 represents a fundamental milestone for Czech construction. Mandatory BIM for above-threshold public contracts will bring higher project quality, better coordination, and more transparent handling of public funds.

Key terms to know: BIM (Building Information Modeling), CDE (Common Data Environment), IFC 4.3 (open data format), information containers (structured data units), BEP (BIM Execution Plan), LOD/LOI (level of detail).

Preparation requires time, investment, and expertise. Companies that start earlier will have an advantage. If you're preparing for BIM – whether as a client, designer, or building manager – it's wise to start with expert consultation and a pilot project.