Revit Drawing Review
Short answer: Revit authors the model and produces the sheets. Its Interference Check compares geometry inside the model and its links. It does not review the issued PDF set, and it cannot see a discipline that was never modelled — which on most projects is several of them.
This is a question about scope, not quality. Revit is the authoring environment for a large share of design work in the United States. The gap below is what happens between the model and the set that actually gets built.
What Interference Check does, and where it stops
Interference Check reports where elements in a Revit model, or in models linked into it, occupy the same space. Run during authoring it catches a duct through a beam while the duct is still cheap to move. It belongs in the workflow and nothing here suggests otherwise.
Its boundary is the model. An element that was never modelled cannot interfere with anything, and a requirement that lives in the specifications is not geometry at all. So the check answers one question well — does this collide with that — and is silent on the rest of what a coordinated set has to get right.
The disciplines that never make it into the model
Architectural and structural are usually modelled. Mechanical and electrical sometimes are. Plumbing, fire protection, fire alarm, low-voltage, telecom, civil, landscape, interior design, food service, signage and the specifications frequently are not — they are drawn, issued as PDFs, and coordinated by someone reading them.
That matters because coordination conflicts do not distribute evenly. They concentrate at the seams between disciplines, and the seams involving the un-modelled trades are exactly the ones no model-based check ever examines. A project can pass Interference Check cleanly and still carry a fire alarm device in a location the ceiling plan does not allow.
The set that gets built is the PDF, not the model
Contract documents are drawings and specifications. The model is a means of producing them. When a sheet and the model disagree, the sheet governs — and sheets acquire changes the model does not always receive, through addenda, bulletins, ASIs and RFI responses issued under deadline.
So the document that has to be internally consistent is the issued set, and the issued set is what nobody checks comprehensively. Rework on building projects runs 4.6% of contract value, measured across 32 buildings in a 2009 study of 359 projects. Design error and omission alone accounts for 1.5% of contract value within that total. On a $40 million job, that 1.5% is roughly $600,000 of field rework traceable to the documents.
Those are third-party research figures, not ours. Each is traced to its primary document in our construction rework statistics register.
How a plan review fits alongside Revit
They operate at different moments on different artifacts. Interference Check runs inside the authoring environment while geometry is being decided. A plan review runs on the issued set, after the drawings exist, across every discipline in the submission including the ones that were never modelled — and it reads the specifications as part of the set rather than as a separate document nobody cross-checks.
Using both is not redundant. One keeps the model honest; the other keeps the set honest.
What Flikt.AI checks
Flikt.AI reads the whole submission rather than sampling it: every sheet against every other sheet, drawings against specifications, across all 16 disciplines at once. It reports spatial conflicts, specification-versus-drawing mismatches, missing coordination where something required is absent from the sheet it belongs on, and clearance issues where drawn dimensions leave less room than the referenced requirement needs. The five kinds of finding are set out here, and where this is not the right tool is published just as plainly.
What you send
Send the 2D PDF drawing set you already have, exported from Revit or assembled from consultant issues, and the specifications if the project carries them. Findings come back tied to the sheets they came from. For the model-based comparison in more detail, see clash detection without a BIM model and reviewing a set without Navisworks.
Frequently asked questions
Can Revit check my drawings for coordination conflicts?
Revit reports interferences between elements inside a model, including linked models, using Interference Check. That is useful while the model is being authored. It does not review the PDF sheet set that was issued, and it cannot see a discipline that was never modelled. On most projects several disciplines arrive as drawings only.
Do I need a Revit model to get a plan review?
No. The review runs on the 2D PDF drawing set, which is the form the project is issued and built in. There is no model to build, nothing to federate, and no modelling staff required.
What does Interference Check miss?
Anything that is not geometry in the model. That includes specification requirements that contradict the drawings, a note on one sheet that disagrees with a detail on another, a schedule that does not match what is drawn, a required element missing from the sheet it belongs on, and every discipline delivered as a PDF rather than a model.
Our architect models in Revit but the engineers do not. Is that unusual?
It is the common case rather than the exception. Architectural and structural are frequently modelled while mechanical, electrical, plumbing, fire protection, fire alarm and low-voltage arrive as drawings. Those disciplines are where a large share of coordination conflicts live, which is why a model-only check leaves the harder half of the problem untouched.
Can the drawings exported from Revit be reviewed?
Yes. Sheets exported to PDF from Revit are ordinary drawings, and they are reviewed the same way any issued set is: every sheet against every other sheet, and the drawings against the specifications.
The pre-IFC coordination checklist
50 checks before you issue for construction, ordered by what actually goes wrong — built from 1,516 findings across 34 real plan sets. Comes as an assignable tracker (Excel) with status, owner and due date, plus a printable PDF. No call, no card.