The construction industry is undergoing a digital transformation. BIM (Building Information Modeling) has fundamentally changed how architects and engineers design buildings — instead of flat 2D drawings, they work with intelligent 3D models packed with information about every element: materials, dimensions, quantities, physical properties. But here is the paradox: all that rich data stays locked inside the architect's software. Revit, ArchiCAD, Tekla — powerful tools, but accessible only to those with a license and the training to use them.

What happens when the model needs to leave the design office and reach the construction site? In most cases, nothing good. The model gets flattened into PDF files, 2D sections, and Excel spreadsheets. Months of intelligent modeling reduced to static images. Bills of quantities are prepared manually, with all the risk of errors and wasted time that entails.

Construction Hub solves exactly this problem. Our platform imports IFC files directly from BIM models, visualizes them in a 3D browser viewer without any specialized software, and automatically extracts quantities that become bills of quantities, offers, and contracts. This is the bridge between design and construction that the industry has needed for years.

What Is IFC and Why It Matters

Industry Foundation Classes — The Open Standard for BIM

IFC (Industry Foundation Classes) is an open international standard for exchanging data between different BIM software products. Developed and maintained by buildingSMART International, IFC is an ISO standard (ISO 16739) and represents a vendor-neutral format that belongs to no single software company.

When the architect works in Revit, the structural engineer uses Tekla, and the MEP engineer works in MagiCAD, IFC is the language they all speak. A file with the .ifc extension contains a complete description of the building:

Geometry — the 3D shape of every element (walls, columns, slabs, windows, doors, MEP systems)
Materials — what each element is made of (concrete C25/30, steel S355, brick, etc.)
Quantities — areas, volumes, lengths, weights, automatically calculated from geometry
Classification — element type (IfcWall, IfcSlab, IfcBeam, IfcColumn, IfcWindow, etc.)
Properties — fire resistance, thermal insulation, load-bearing capacity, and dozens more
Relationships — which element belongs to which floor, which elements intersect, which are part of a system

Unlike proprietary formats (.rvt for Revit, .pln for ArchiCAD), IFC is open — any software can read and write it. This makes it the ideal format for passing information between different participants in the construction process.

Why Not DWG or PDF?

DWG files contain only geometry — lines, arcs, polylines. They have no concept that a group of lines represents a "wall" made of "concrete." PDF files are even more limited — they are simply images. Neither DWG nor PDF can be automatically analyzed for quantity extraction.

IFC, on the other hand, is a semantic format. It does not just describe how the building looks — it describes what the building is. Every element has a type, material, quantities, and relationships with other elements. This makes IFC the only format from which quantities can be reliably and automatically extracted.

The Problem: A BIM Model Nobody Uses on Site

Architecture firms invest hundreds (sometimes thousands) of hours creating BIM models. Structural engineers add reinforcement and loads. MEP engineers model plumbing, HVAC, and electrical systems. The result is an extraordinarily detailed digital model of the building that contains practically everything needed to construct it.

And then what happens?

The Classic Scenario

The architect finishes the BIM model in Revit
Exports 2D drawings as PDF or DWG
Sends them to the investor and contractor
The quantity surveyor opens the drawings and manually measures areas, lengths, counts
Transfers the numbers into an Excel spreadsheet
Creates a bill of quantities (BoQ) from scratch
The offer is based on this manual BoQ
When the design changes — the entire process repeats

This workflow is not only slow (days to weeks for complex projects) but also error-prone. Manual measurement from 2D drawings misses elements, confuses dimensions, and does not account for 3D intersections. Studies show that manual BoQs contain 10-30% errors in quantities.

The Lost Value

The saddest part is that all these quantities already exist in the BIM model. Revit knows the area of every wall, the volume of every slab, the length of every pipe. But this information is lost the moment the model is converted to PDF.

The problem is not technical — the IFC standard has supported quantity export for years. The problem is the lack of tools that construction companies can easily use. Not everyone has a Revit license (costing 3,000-4,000 EUR per year), nor should construction engineers be required to learn how to operate it.

How Construction Hub Imports IFC

Construction Hub is designed to be the bridge between the BIM model and construction management. Here is how the entire process works.

3D Visualization in the Browser — No Revit License Required

When you upload an IFC file to Construction Hub, it is processed by our IFC engine and visualized directly in the browser as an interactive 3D model. No additional software is needed — it works in Chrome, Firefox, Safari, Edge, even on a tablet or phone.

The 3D visualization is not just a pretty picture. It is a fully functional model viewer:

Navigation — rotate, zoom, pan with mouse or touchscreen
Element selection — click on a wall, column, or window to see its full information
Floor filtering — display only a specific floor or group of floors
Type filtering — hide all walls and see only the structure, or vice versa
Transparency — make certain elements semi-transparent for better visibility
Measurement — measure distances directly in the 3D model
Sections — cut through any arbitrary plane

This means every project participant — from the investor to the site foreman — can explore the model and understand exactly what is being built, without expensive software or specialized training.

Automatic Quantity Extraction

The real power of IFC import is not the visualization — it is the data. When Construction Hub processes an IFC file, it analyzes every element and extracts its quantities:

Walls — area (m2), volume (m3), thickness, height, length
Slabs — area (m2), volume (m3), thickness
Columns — volume (m3), height, cross-section
Beams — volume (m3), length, cross-section
Windows and doors — count, dimensions (width x height)
Pipes and ducts — length (m), diameter/size
Reinforcement — weight (kg), diameter, length

These quantities are not "measured" from geometry — they are extracted directly from the data that the BIM software calculated. This guarantees maximum accuracy because the same values that the architect or structural engineer sees in their model are used.

The result is a structured table of all elements, grouped by type and floor, with precise quantities for each. This table is the starting point for creating a bill of quantities.

AI Nomenclature Matching with Embeddings

Extracting quantities is only half the task. The other half is connecting the IFC elements to specific construction work items from the company's nomenclature.

For example, the IFC model describes an element of type IfcWall with material "Reinforced Concrete C25/30" and thickness 25 cm. But in the construction company's nomenclature, the corresponding item might be called "Formwork, reinforcement, and concreting of walls d=25cm, concrete C25/30" — with different abbreviations and phrasings.

Construction Hub uses AI-powered semantic search to find the best matching nomenclature item for each IFC element. The system works with text embeddings — mathematical representations of text that capture semantic meaning rather than exact word matches.

The process works as follows:

IFC element description — the system generates a text description from the element's type, material, and properties
Embedding generation — the description is converted into a 512-dimensional vector using OpenAI text-embedding-3-small
Semantic search — the vector is compared against the company's already-indexed nomenclature items
Ranking — the top 5 closest matches are presented to the user
Confirmation — the user selects the correct item or adds a new one

On subsequent imports, the system remembers previous mappings and applies them automatically. Over time, the accuracy of automatic matching increases as the system learns from user decisions.

From Model to Bill of Quantities

Once quantities are extracted and nomenclature items are matched, Construction Hub automatically generates a bill of quantities (BoQ). This BoQ is not just a table — it is a full object in the system, linked to:

Project — the building or project it belongs to
Line items — each item with nomenclature code, description, unit of measurement, and quantity
Unit prices — from the company's price lists (if available)
Values — automatically calculated from quantities multiplied by unit prices

From this BoQ, an offer can be generated for the client with a single click. After negotiations and adjustments, the offer becomes a contract with all items, quantities, and prices carried over automatically. The entire path from BIM model to signed contract is digitized.

The Real Workflow: From Revit to Payment Certificates

Let us trace a real workflow for a 5-story residential building.

Step 1: The architect exports IFC. The architect opens the project in Revit (or ArchiCAD, or another BIM tool) and exports an IFC file. Most BIM software supports IFC 2x3 and IFC 4 — both are supported by Construction Hub.

Step 2: Upload to Construction Hub. The project manager or quantity surveyor uploads the IFC file. Processing takes 1-3 minutes depending on file size (a typical residential project is 50-200 MB).

Step 3: 3D review and verification. The model appears in the 3D viewer. The team can explore it, verify that all elements are present, identify potential issues, and discuss details with the architect — directly in the browser, without Revit.

Step 4: Quantity extraction. With a single button press, the system extracts quantities from the model. The result is a structured table of all elements, grouped by floor and type.

Step 5: Nomenclature matching. The AI system suggests matches between IFC elements and the company's nomenclature items. The user reviews and confirms or corrects the suggestions. On a first import, this takes 20-30 minutes for a typical project. On subsequent imports of similar projects, most matches are automatic.

Step 6: BoQ generation. The system generates a bill of quantities with all items, quantities, and (if available) unit prices. The BoQ can be exported to Excel or kept in the system for further work.

Step 7: Offer and contract. An offer is generated from the BoQ with one click. After negotiations, the offer becomes a contract with all items and values carried over.

Step 8: Progress certificates during construction. During construction, the contractor creates payment certificates for completed work. The line items come from the contract (which came from the BoQ, which came from the BIM model). The circle is complete — from 3D model to certified completed work.

What This Process Saves

Metric	Traditional approach	With IFC import
Time to BoQ	3-5 days	2-4 hours
Quantity accuracy	70-90%	95-99%
Software licenses	3,000-4,000 EUR/year for Revit	0 EUR (included in platform)
Design changes	Manual re-measurement	Re-import new IFC
Traceability	None	Full (model > BoQ > offer > contract > certificate)

Who Benefits from IFC Import

General Contractors

For general contractors, IFC import is a direct competitive advantage. Instead of waiting days for a manual BoQ, they can prepare an accurate offer in hours. When the design changes, they re-import the new IFC and see exactly what changed. During execution, they have full traceability from model to completed work.

Investors and Developers

Investors rarely have a Revit license or trained staff. With Construction Hub, they can explore the 3D model of their project in the browser, understand what is being built and how much it will cost, without depending on the architect for every question.

Design Offices

Architecture and engineering firms can deliver additional value to their clients. Instead of handing over just drawings, they upload the IFC model to Construction Hub and give access to the investor and contractor. This increases the value of the BIM service and reduces "what is this on the drawing?" questions.

Project Management Companies

PM companies that manage construction projects on behalf of investors gain a powerful control tool. They can compare offers from different contractors against the model's quantities and identify overpricing or missing items.

Subcontractors

Even subcontractors benefit — they receive precise quantities for their specialty (e.g., plumbing installations) directly from the model, instead of measuring from drawings.

The BIM Future: EU Mandates and Competitive Advantage

European Trends

The European Union is increasingly pushing BIM adoption in construction. The public procurement directive (2014/24/EU) already allows member states to require BIM for public projects. Several countries have done so:

United Kingdom — BIM Level 2 mandatory for public projects since 2016
Germany — BIM mandatory for federal infrastructure projects since 2020
Scandinavia — BIM has been the de facto standard for over a decade
Italy — phased introduction from 2019, full mandate from 2025

The question is not whether BIM will become standard across Europe, but when. Companies that are already equipped to work with BIM data will have a significant advantage over those still relying on 2D drawings and manual quantity takeoffs.

The Competitive Advantage Now

You do not need to wait for a legislative mandate to benefit from BIM. Even if only 20-30% of your projects have BIM models today, automating the work with them delivers immediate value:

Faster offers — win the contract because you are first with an accurate price
Fewer errors — avoid losses from missed quantities
Better communication — show the client a 3D model, not 2D drawings
Easier changes — re-import the new model and see the differences
Modern image — demonstrate that you work with the latest technologies

Technical Details

Supported Versions and Formats

Construction Hub supports the following IFC versions:

IFC 2x3 — the most widely used version, supported by all BIM software
IFC 4 — the newer version with improved geometry and properties
IFC 4x3 — specialized for infrastructure projects (roads, bridges)

Supported file formats:

.ifc — standard STEP text format
.ifczip — compressed IFC file (up to 10x smaller)

Export Recommendations

For optimal results when exporting IFC, we recommend:

Include Base Quantities — in Revit: File > Export > IFC > Property Sets > Export Base Quantities
Use IFC 2x3 or IFC 4 — they have the best compatibility
Name your levels — proper level naming helps with floor grouping
Check classification — elements should be correctly classified (a wall as IfcWall, not as IfcBuildingElementProxy)

Size and Performance

IFC size	Elements	Processing time	Visualization time
Up to 50 MB	~5,000	<1 min	Instant
50-200 MB	5,000-20,000	1-3 min	2-5 sec
200-500 MB	20,000-50,000	3-7 min	5-10 sec
500 MB+	50,000+	7-15 min	10-20 sec

Frequently Asked Questions

Do I need a Revit license to use IFC import? No. Construction Hub works directly with IFC files. You only need Revit (or another BIM tool) if you are creating the model. If you receive a model from an architect, simply upload the IFC file.

What if the model does not include quantities? Even if the BIM software did not export Base Quantities, Construction Hub can calculate basic quantities (areas, volumes, lengths) from element geometry. Accuracy is slightly lower but still significantly better than manual measurement.

Can I import a model from ArchiCAD? Yes. ArchiCAD has excellent IFC export support. In fact, Graphisoft (the creators of ArchiCAD) are among the founders of buildingSMART and the IFC standard.

Are MEP models supported? Yes. IFC contains full descriptions of plumbing, HVAC, electrical, and other MEP systems. Construction Hub extracts pipe lengths, fitting counts, duct areas, and other MEP quantities.

What happens when the design changes? Upload the new IFC file and the system compares it with the previous one. Quantity changes are reflected automatically. You can see which items changed and by how much.

Conclusion

IFC import in Construction Hub is not just a technical feature — it is a fundamental shift in how construction companies work with design documentation. Instead of spending days on manual measurement from 2D drawings, they get accurate quantities in minutes. Instead of paying thousands of euros for software licenses, they work in the browser. Instead of losing information at every handoff, they maintain full traceability from model to payment certificate.

The future of construction is digital, and BIM is its foundation. Construction Hub is the bridge that makes this digital information accessible and useful for every participant in the construction process.

What Is Construction Management Software? — A complete guide to digitizing the construction process
AI Data Extraction from Construction Documents — How artificial intelligence automates invoice, offer, and BoQ processing
Construction Quantity Survey Software — Why Excel is no longer enough for bills of quantities

Ready to connect your BIM model to real construction project management? Contact us for an IFC import demo or start with a free trial.

IFC Import — How to Connect Your BIM Model to Construction Project Management