Send a sheet set. Structura converts it, then shows you what it found on top of the drawing it found it in. You accept, correct or reject, and export. Every export is a version you can re-download or share, and everything Structura had to assume along the way arrives written down beside the model.
Plans carry the footprint — walls, door and window openings, columns, stair runs and the closed regions that become rooms. Elevations carry the vertical story: floor-to-floor heights, sill and head levels. Neither sheet is complete on its own; the two are reconciled into one stack of named storeys.
A 3D export gives Structura the building directly rather than as line work: the same element classes are recovered from the geometry, including pitched roofs, which plans cannot show. Rooms are a plans-route feature, and the model records that rather than guessing.
Both routes take DXF only, up to 50 sheets and 15 storeys per conversion, and both end at the same file. A set outside those bounds is refused with a clear reason — see the limits.
You send a sheet set — plans and elevations, or a 3D export. Structura converts it into a model and tells you where it is while it runs. A conversion either finishes or fails at a named point, and you are told which; it never hands back a half-built model.
What was found is shown to you on top of the drawing it was found in. Anything Structura is not sure about is flagged and queued, and you can switch the queue to show everything it found rather than only the flags. You accept, correct or reject — a person signs the model off, not the software.
Your corrections are applied by a re-export, which produces a new immutable version: the IFC, a schedule as a spreadsheet and as CSV, and the register of everything Structura had to assume. Older versions stay downloadable and any version can be shared as a read-only link.
Convert the same sheets twice and you get the same file, identifiers included. Nothing about the result depends on which day you ran it or which machine ran it, which is what makes a re-issue a difference your model server can read rather than a new building.
What a finished conversion leaves you with: the model open in the workspace, every element selectable, each one carrying the class, storey, dimensions, confidence, source sheet and GlobalId the file was written with.
Drawings leave things out. A storey height nobody dimensioned, a wall shown from one side, a room with no label — a conversion has to do something, and quietly picking is how a model becomes untrustworthy.
So where a drawing does not say, Structura assumes something and writes down what it assumed, what it applies to and what it affects. The register is delivered with the model as a file of its own: you read it, you do not have to trust it, and nobody discovers it during a handover.
Anything Structura is not sure about is flagged and queued for review before the model is signed off — and a reviewer can switch the queue to show everything it found, not only the flags, when they want to audit the confident majority too.
Each queue item is shown beside an evidence tile: a crop of the drawing the element was detected in, with the element outlined on it. You are comparing the model to the drawing, not to a description of the drawing.
Reviews do not edit the exported file in place. They accumulate as corrections and are applied by a re-export, which produces a new immutable version.
The detection is right. The element keeps its class and dimensions, and the flag is cleared with your name against it.
Right object, wrong class — a window read as a door. Pick the correct class and the model is rebuilt with it.
Right class, wrong numbers. Type the dimension the drawing actually shows; the geometry and the schedule follow.
Not a real element. It leaves the model, and the rejection is recorded rather than quietly dropped.
A room whose label the drawing never gave, or gave wrongly. Naming a space does not move it, so its identity — and its GUID — is unchanged.
The crop above is the real tile the app serves for a flagged window on a plan sheet of the sample, with all-detections switched on: the flagged element is outlined in amber and everything else Structura found in the same crop is outlined in blue. That is the whole argument for the queue — the drawing is on screen next to the claim.
Each re-export is a new version that never overwrites the last one. Its label is the diff itself — how many detections were accepted, reclassified, dimension-edited, rejected and renamed — with the reviewer's account against it. Older versions stay downloadable, so a model issued last month can still be produced.
A version can be published as a read-only link: the recipient opens the model in a browser with no account and no sign-in, sees the elements and their dimensions, and can change nothing. It is how you send a model to someone who will never install a BIM viewer.
The IFC file itself, an element schedule as a spreadsheet and as CSV, and the assumptions register. The model and both schedules make up the sample package on the deliverable page — produced by a real conversion, not assembled by hand.
One screen, three of the claims on this page at once: the version rows and what each re-export changed, the format select that re-downloads the same immutable version as the file or as a schedule without reconverting anything, and the share panel with a live read-only link and the date it expires.
The honest way to find out whether this survives your drawings is to convert a set of them. Send us the sheet list and we will convert it with you, then hand back the file, the schedule and the register of everything Structura had to assume.