Prepare multi-floor PDFs and drawing fragments for reconstruction

Count physical floors before counting PDF pages. A ground floor and an upper floor consume two floors even when they are drawn on one page; several sheets showing fragments of the same ground floor still describe one physical floor. Cover sheets, elevations, sections and detail drawings are context, not additional floor plans.

1. Choose the source for each physical floor

Use a drawing you have permission to upload, in PDF, PNG, JPEG, SVG or DXF, up to 25 MiB per supported upload. Prefer the latest dimensioned drawing. Keep its title, revision, scale bar and useful dimensions readable. A raster scan can work, but enlarging a blurry scan does not restore the door and window symbols it lost.

In drawing preparation, select the pages that contain floor plans and leave unrelated sheets out of the reconstruction.
Create one floor entry for each physical level. Use Floor name, Drawing and Page number to identify the correct source.
When one page contains several levels, assign a separate crop to each physical floor. Do not submit the entire sheet as one room layout.
When one level spans several sheets, assign its fragments to that same floor. Keep enough overlap or matching reference geometry to compare their placement.

2. Crop and align fragments without losing scale evidence

Trim page furniture and unrelated diagrams while preserving all boundaries and openings needed for the floor. Rotate a fragment to its intended orientation, then compare the walls and reference points shared with the next fragment. Check crop, rotation, scale and placement together: matching one corner does not prove that the far end aligns. Do not invent a gap width when the source is missing.

Source conditionCheck

Two sheets of the same levelShared wall runs, room names and overlapping dimensions agree; the overlap is not counted as a second room.

Different drawing scalesUse each sheet’s scale evidence and known dimensions; do not align them by visual size alone.

Missing part of the floorRecord the missing area and request a complete source rather than closing it with guessed walls.

Phone photographPerspective and bent page edges can change proportions; obtain a square scan or a better source before trusting dimensions.

What to inspect before combining fragments.

3. Review the floor stack and stair connections

Enter elevations and heights from evidence you can verify. Elevation describes where a floor sits relative to the levels around it; ceiling height describes a different dimension. Compare the stack order, alignment and stairs between neighboring floors. Read the warnings for each floor. A plan alone may not establish slab thickness, ceiling height or the stair connection, so leave those questions visible for review.

4. Confirm the prepared floors and inspect the reconstruction

Before using Build all floors, check the floor count and prepaid balance. The eligible first build before payment applies to one physical floor; additional, ineligible and multi-floor builds need prepaid floors. A paid build that fails returns its floor to the balance. Preparation on this device is not the same as a saved model or a finished build. Avoid duplicate submissions while a request is running.

When a building needs review, inspect every available floor, its source page, reported scale, room boundaries, door and window positions, alignment and stair matches. Check a known length and a second independent dimension. Confirm the building only after reviewing the issues that matter to your intended use. A partial success is not a complete building: identify the available levels and the failed ones separately.

For the basic conversion checks, read the PDF-to-3D guide. If a build or scale rebuild stops, use the recovery guide before repeating the request.