Describe the building. The AI builds it.
BIM Harness turns a written brief into a real BIM model — storeys, structure, rooms, roof, ventilation and electrical installations. Not a picture. IFC you keep working with.
For architects, engineers and developers. Nothing to install — the whole editor, AI included, runs in the browser.
from brief to a building with its services
of AI specialists over one model
to rebuild a hospital of 1,896 elements
real entities with parameters, not pixels
From one sentence to a finished model
Watch the AI build a building — and how you refine it by dragging, or with the next sentence.
An AI that doesn’t draw pictures. It builds models.
There are hundreds of image generators. BIM Harness is the only tool we know of that returns a complete, still-editable BIM model from a description.
Image AI
BIM Harness
The output isn’t inspiration. It’s a project in progress.
Our own kernel, not a layer on someone else’s CAD
Most AI tools for architecture are plugins for Rhino or Revit — and they inherit both their ceiling and their licence. BIM Harness stands on a parametric kernel we wrote from scratch. That is precisely why it can do what a wrapper cannot reach.
The kernel is a parametric model in the browser — not IFC in memory, and not fragments. Move a wall and only what hangs on it regenerates; that is why an edit is instant and a hospital of 1,896 elements rebuilds in 194 ms. Fragments only draw the same geometry on the GPU. IFC is the entrance and the exit.
A parametric object model
A wall knows it is a wall: it has a build-up, mitred corners, openings as a relation and a dependency graph. Change the type and the model regenerates — no rewriting lines in a file and hoping.
Grids, families, types and formulas
Structural grids, columns on intersections, datum elements, families with parameters and unit-checked formulas. Exactly the layer desktop BIM tools stand on — in the browser, without a five-figure licence.
Views, drawings and schedules
Plans and sections are generated from the geometry, annotations belong to the view, and schedules work both ways: overwrite a number in the table and the model changes.
IFC is the boundary, not the internals
The model does not live as STEP lines in memory. IFC is imported at the entrance and generated deterministically at the exit — which is why the export never collapses into triangle soup.
automated tests on the kernel alone
faster model rebuilds after moving to the kernel
dependencies on third-party licences
A wrapper over someone else’s API takes a month to build. This is a year of work on geometry, constraints and regeneration — and it is the reason a sentence turns into a building rather than a cloud of triangles.
How it works
Four steps from a brief to a model that goes straight into design practice.
Describe the building
In your own words: “Apartment building, four storeys, twelve flats, gable roof, basement storage.” The more detail, the more precise the design.
A team of AI takes it apart
The brief is not handled by one prompt. It is split between roles — architect, structure, HVAC, plumbing, electrical, fire — and each writes into its own module.
The model gets checked
Before you see the design it passes a completeness and clash check. Whatever crosses gets rerouted; whatever is missing is filled in deterministically.
Refine and export
Move walls, swap windows, add equipment — by dragging or with the next sentence. Then IFC into Revit, Archicad or your CDE.
Not a shell. A building with services in it.
Massing generators stop at the envelope and the layout. Harness carries on where a designer’s real work starts — services, penetrations and coordination.
Architecture and layout
Storeys, rooms by typology, the circulation core, open-plan relations, atria and set-back storeys with a terrace and parapet.
Structure and roofs
Columns on grid intersections, beams, gable, hipped, half-hipped, mansard and pavilion roofs — over L, U and T footprints, with per-wing ridges and valleys.
Ventilation, plumbing and heating
Mains in the ceiling void with height bands set by the rooms they cross, shafts at the end of corridors, risers, and penetrations cut into the structure.
Electrics down to the circuits
Service connection, meter, a switchroom as an actual room, boards per floor, feeders sized for the floor load, circuits, emergency lighting, UPS and a generator.
Data and low-voltage
A data board and a data riser routed at a distance from the power riser, with a fire alarm panel chosen by building type.
Clash detection that doesn’t lie
Clashes are measured analytically — distance between route axes minus radii, containment of a centreline in a solid. No boolean intersection reporting 4,000 litres for two pipes a metre apart.
After the check and the generator were rewritten, clash counts on the benchmark buildings dropped from 587 to 28 on the bungalow and from 2,898 to 113 on the four-star hotel. What remains are services crossing each other — exactly what gets settled in a coordination meeting. And a self-play harness keeps stress-testing the whole chain on dozens of generated briefs.
Your project in. Your format out.
Harness is not a walled garden. It opens IFC from Revit and Civil 3D, writes properties to the Czech building data standard and hands you drawings as PDF.
IFC import with no silent loss
Every entity type in the schema has a declared fate and every element shows up in the import report. Across real-world exports from Revit 2021–2024 to Civil 3D — IFC2X3, IFC4 and IFC4X3, alignments included — measured import coverage is 1.0. What doesn’t import, you know about; nothing vanishes without a trace.
Building data standard
Properties are written as typed IFC values, the model validates against IDS, and the vocabulary of the Czech data standard (ČAS) loads straight from the public API. CCI classification lives in the project as maintained data, not as a note.
Drawings, PDF and exchanges
Plans and sections are generated from the model geometry and exported to PDF — dimensions, annotations and full diacritics included. The schedule exchanges with MS Project, the take-off with Excel.
import coverage on real-world exports
IFC4 types with a declared fate
to open a 35 MB IFC file
Test corpus: 57 real files from 0.1 MB to 2.5 GB — Revit 2020–2026, Civil 3D, Bentley.
So it doesn’t look like a box with windows
Generative design has a reputation for grey blocks. That is why Harness has its own ornamental architecture layer — and it builds real geometry, not a texture on the façade.
Ornament as geometry
Cornices, window surrounds, corner rustication, pilasters, columns, balustrades, arches, gables and dentils. Shaped profiles swept along the perimeter that break at openings and regenerate when you edit.
State the style in words
“A neoclassical villa.” “A Mediterranean guesthouse.” The AI picks the style and the level of ornament, the engine builds it deterministically — so the same brief returns the same house, not a fresh roll of the dice.
Realistic mode is the default
Procedural textures for roof tiles, render, sandstone, timber and stainless steel, a sky with a sun, soft shadows and filmic tone mapping. The model looks like a building right in the editor, not an hour later in a render tool.
Everything BIM Harness can do
AI design is just the start. Underneath sits a full BIM editor.
AI design of a whole building
A written description becomes a complete model: layout, structure, openings, roof, façade rhythm and services.
A team of 30 AI specialists
It is not one prompt working on the model. A registry of 30 roles — from structure and HVAC to fire — each writing into its own module while an architect holds the whole.
Iterate with the next sentence
“Add a storey.” “Enlarge the south-facing windows.” The AI updates the model, versions sit side by side — and a built-in prompt advisor helps you write a better brief.
An editor like professional CAD
A ribbon with contextual tabs, two-key accelerators, an options bar at the point of drawing, smart snapping and precise dimensions. In the browser, nothing to install.
Ornamental architecture
Cornices, pilasters, balustrades, rustication and premium textures — from the palette or with a single sentence to the AI.
IFC import
Open your own project from Revit or Civil 3D. Every entity has a declared fate and the import ends with a report, not with silent data loss.
Data standard and classification
Typed IFC properties, IDS validation, the vocabulary of the Czech data standard (ČAS) and CCI classification right in the model.
Drawings and PDF
Plans and sections generated from the model, annotations and dimensions that belong to the view, PDF export with full diacritics.
Construction scheduling (4D)
Activities bound to model elements, dependencies, critical path, calendars, resources and baselines. A Gantt inside the editor and a two-way MS Project exchange.
Quantity take-off (QTO)
Volumes, areas and counts measured from the kernel geometry — by material, class and storey. Recalculated live as you edit, exported to XLSX and CSV.
Scripting API
Batch edits by script — the same API the AI agent builds the model with. Whatever it can do, so can you.
Open IFC and CDE
Export any time, with no locks. Share, version and review the model in the Conexium CDE.
A look inside the editor
From the generated design to detailed edits — all in one browser window.
Who BIM Harness is for
For everyone who needs a real model out of an idea, fast.
One model works out at 40 €
per month on the Start plan
complete models, services included
per generated model
What an hour in the studio costs, you know better than we do. This is a fraction of one — and what comes back is not a picture for a presentation but a project in progress, services and all.
Pricing
Monthly packages with credits. 100 credits ≈ 2 million tokens ≈ 5 building designs.
Trial
For anyone who wants to try it out first
- Full editor and IFC export
- AI designs and iterations on the model
- Realistic materials and an equipment catalog
- E-mail support
Start
For individuals and first projects
- Full editor and IFC export
- AI designs and iterations on the model
- Realistic materials and an equipment catalog
- E-mail support
Studio
For practices that design every week
- Everything in Start
- Project sharing across the team
- Priority support
- Scripting API
Max
For studios running non-stop
- Everything in Studio
- Discounted credits: 100 for 80 €
- Onboarding with our team
- Early access to new features
Out of credits? Top up any time.
Credits track actual AI usage — you pay for what you use, just like API pricing. When the monthly allowance runs out, buy more by the hundred and keep working.
On the Max package the discounted top-up rate applies permanently — it pays off for anyone generating more than a few designs a week.
Not sure which package fits? Write to us — we’ll walk through your workload and recommend one.
We are not registered for VAT — the prices shown are final.
Frequently asked questions
Didn’t find your answer? Write to us — we’re happy to show BIM Harness live.
Build your first building today.
Write to us — we’ll set you up with BIM Harness, walk you through your first design and help you pick the right package.
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