Open the file before you open your wallet. A 30 minute test that catches the duct through the beam, the unread clash report, and the family that brings Revit to a crawl.
In this article
- The problem
- Check 1: Warnings and heavy families
- Check 2: Coordinates, grids, and levels
- Check 3: Clashes, run by you
- Check 4: LOD by zone
- Check 5: Quantities and the IFC export
- Check 6: Tags and usable data
- Check 7: The BIM Execution Plan
- One page checklist
- Cost, in house or outsourced, and red flags
- The quote email to send
- Questions people ask
Short answer: BIM modeling services should be checked before you pay. Run 7 checks: warnings, coordinates, clashes, LOD by zone, IFC quantities, usable data, and the BEP. If a model fails any check, send it back with the exact numbers, not a vague complaint.
The screenshot looked fine. The ceiling void told a different story.
The render was clean. Then someone sectioned the model at the corridor, and there it was: a main duct running straight through a beam. Bad models survive because they get reviewed in screenshots. They fail in sections, in schedules, and in the file itself. Run these 7 checks before you pay. You need Revit and Navisworks, the native file, and the drawings the model was built from. If a provider will only send screenshots, stop there. This is a short guide to buying BIM modeling services without paying for a model you cannot use.
Check 1: Open the native file and look at the mess first
Open the model in Revit and open the warnings dialog first. A handful of warnings is normal. Hundreds left at submission is a sign the team saw them and carried on anyway. One account of how a clean BIM model slowly turns into a disaster lists warnings ignored, families downloaded from online libraries without checking quality, CAD imported instead of linked, and duplicate families. Also check file size, count in-place families, and open the heaviest family.
Send back: the warning count, the five worst families by size, and a list of imported CAD. Ask for warnings cleared or explained, CAD linked rather than imported, and heavy families swapped for lighter versions that keep the connection points and clearance zones.
Check 2: Coordinates, grids, and levels
Link the structural model into the architectural model and compare. Check the project base point and shared coordinates against the survey, three grid intersections, two finished floor levels, and one ceiling height in a corridor. This takes about ten minutes. If the structural model sits a few inches away from the architectural model, every trade that follows inherits the drift. Measure a corridor width, a door head height, and three duct elevations, and write them down with the grid reference.
Send back: stop the job. Do not coordinate MEP against a base model in the wrong place. Fix coordinates, grids, and levels first, reissue the base, then restart coordination.
Check 3: Clashes, run by you
Do not accept a clash report as proof that clash detection happened. Run your own test in Navisworks between structure and MEP, set the tolerance yourself, and group the results before you read them. Zero clashes on a first run usually means the test was set up loosely. Thousands of entries with no grouping means nobody sorted signal from noise. A usable report groups clashes by area or system, names an owner for each group, drops duplicates, and separates hard clashes from clearance issues. See how dense coordination worked on our data center project.
Send back: the report regrouped, with owners named and duplicates removed, plus the tolerance the test used.
Check 4: LOD by zone, in writing
LOD means level of development: how much you can rely on one element. It never describes a whole building in one number. Walls might sit at LOD 300 while plant room piping sits at LOD 350 and the site sits at LOD 200, all correctly. Scan work is where buyers overpay most often. This list of 7 costly Scan to BIM mistakes puts a number on the trap: LOD 350 applied everywhere can cost 2 to 3 times the detail nobody uses. Write the level down per system and per area before work starts. Our Scan to BIM and 3D scanning and reality capture work follow the same rule.
| LOD | What you get | Good for |
|---|---|---|
| 100 | A block or shape, rough size and position. | Early concepts. |
| 200 | Approximate size, shape, location. | Planning, estimates. |
| 300 | Sized and placed as designed. | Design, estimates, coordination. |
| 350 | LOD 300 plus supports and sleeves. | Coordination. |
| 400 | Fabrication detail. | Shop drawings, fabrication. |
| 500 | Checked against what was built. | As-built, handover. |
Send back: any scope that names one LOD for the whole building, with no breakdown by system or area.
Check 5: Quantities and the IFC export
Export the IFC. Open it in a viewer that is not Revit. Take five quantities from it and compare them against the Revit schedule and the drawings: a duct run, a run of pipe, a set of doors, a length of cable tray, a concrete volume. Check net against gross quantities, and whether properties survived the export. This breakdown of ten IFC mistakes that end up on site names the ones we see most: manufacturer objects with tens of thousands of calculations, and duplicate GlobalIds that break change tracking and BCF. See our 5D BIM cost estimation work and our construction bid and IFC drawings page.
Send back: the five quantities you checked, the values from the model, and the values from the drawings, plus the export settings, with duplicate GlobalIds cleaned up.
Check 6: Tags, parameters, and whether anyone can actually use this model
Open three schedules: doors, mechanical equipment, rooms. Empty schedules, placeholder objects still sitting where real equipment should be, and elements with no tags tell you the model was built to look finished in 3D rather than to be used after the modeler. This piece on why most BIM models are not actually that useful makes the point bluntly: a model that cannot drive scheduling, procurement, or compliance will fall into disuse. Test it as a downstream user would. Can you pull the air handling units as a clean schedule in five minutes? Can you find every fire rated door and its rating from the data? Also check parameter names across disciplines, because different names for the same thing will make filters miss elements.
Send back: the schedules that came back empty or wrong, the placeholder objects by type mark, and the name of who owns data governance on the job. See our digital twin and facility management service for handover and long term use.
Check 7: The BIM Execution Plan, or whatever rulebook replaced it
Every check above depends on a rule someone wrote down before modeling started. That rulebook is the BIM Execution Plan, the BEP. A good BEP covers: roles, LOD, software version, the common data environment, folder structure, worksharing, coordinates, naming, families and parameters, clash detection, meetings, quality control, and handover. One warning on AI: applying AI to a disorganised model does not fix the model, it produces errors faster.
Send back: the BEP, or the one page scope that does its job, covering LOD, software version, file location, naming, clash routine, and handover format. Get it before the next issue, not after the final one.
What the 7 checks look like on one page
- File health: warning count read, worst families named, imported CAD listed.
- Position: base point, shared coordinates, three grids, two levels verified.
- Clashes: your own clash test run, tolerance recorded, report grouped and assigned.
- LOD: LOD written per system and per area.
- Quantities and IFC: IFC opened outside Revit, five quantities compared, GlobalIds checked for duplicates.
- Usable data: door, equipment, and room schedules pulled clean, no placeholders.
- Rulebook: BEP or scope sheet on file, covering roles, version, naming, clash routine, and handover.
Want a rough number before you talk to a provider? Run your project through our BIM cost calculator and ROI estimator, then send the result to us from our contact page with your drawings.
What drives the cost, in house or outsourced, and red flags
This is the part of BIM modeling services where most buyers overpay. We checked four provider pages. Virtual Building Studio (400+ US trained staff, 4,000+ projects), United-BIM (12+ years, over 1,000 projects, East Hartford, CT), and Advenser (since 2007, 35 countries) post no price for general modeling. HSE Contractors says cost depends on scope. What moves a quote: LOD, MEP density, quality of what you send, coordination rounds, standards, speed, and revision count.
If you are comparing bim outsourcing services, judge them on the same 7 checks, not on hourly rate alone. Scan modeling is the exception, because the input is fixed. You supply a registered point cloud, and on our Scan to BIM page modeling runs from $0.15 per square foot at LOD 200, from $0.20 at LOD 300, and from $0.40 at LOD 350 and above. US providers are put at $0.50 to $2.00 or more. Those numbers cover modeling from a cloud you already have, not the scan itself, and not general modeling from drawings. For general modeling, send the files first, take the scope review, then ask for a fixed price in writing, tied to a written LOD per system. Try our BIM cost calculator and ROI estimator first. See also our architectural GFC drawings, rebar and steel detailing, MEPF design support, data center, and tyre manufacturing plant pages.
| Question | In house | Outsourced |
|---|---|---|
| What you pay for | Salary, software, training, idle weeks. | The agreed scope, for the weeks you need it. |
| Weak spot | One resignation can stall three projects. | Quality varies widely. |
| Best fit | Steady workload, one standard set. | Peaks, bid deadlines, a rare discipline. |
Red flags: firm price before drawings are opened, LOD 500 for new design work, no sample area on a large job, screenshots only, no named checker, and refusal to work in your template or hand over native files. Outsourcing still needs a reviewer on your side.
Copy this email if you want a useful quote
Most quote requests fail in one line: please quote BIM modeling for our project, 80,000 square feet. Nobody can price that. Send this instead: Subject: Quote request, BIM modeling, [project and city]. Building: [type] in [city, state], [ ] sq ft over [ ] floors. Disciplines: [architectural / structural / MEP]. LOD by zone: [example, architectural 300, structural 300, MEP 350 in ceilings and plant rooms]. We will send: [Revit / CAD / PDFs / point cloud], in [software and version]. We need back: [native model, sheets, grouped clash report, quantities, IFC]. Rulebook and template: [ours, attached / yours, if approved]. Coordination: [weekly clash cycles, rounds, tolerance / not in scope]. Checks at first issue: warnings, coordinates, our clash test, five IFC quantities, door and equipment schedules. Dates: first area by [date], full model by [date]. Rounds priced: [number]. Please confirm scope, price, and who will check the model. We can sign an NDA first. Thanks, [Name, company, phone]
Questions people actually ask us
How much will my model cost?
Not from square footage alone. LOD, MEP density, and drawing quality move the price more. Send the files, take the scope review, then ask for a fixed price tied to a written scope. Scan rates are in the cost section above.
Can you work in our Revit template and our BEP?
Yes. Send the template, BEP, and Revit version before anyone starts. We model in your template, with your worksets, on Autodesk Construction Cloud or BIM 360.
What LOD do I need for coordination?
LOD 350 for the systems you plan to coordinate, in the areas where they run tight. Supports and sleeves need to be in the model, or the clash test will pass runs that will not fit on site. LOD 300 is enough for design drawings and a sound estimate. LOD 400 belongs where fabrication will read it.
Will you sign an NDA?
Yes, on request. Ask before you send files, and get it signed before drawings or a point cloud leave your office.
About OneClick BIM
OneClick BIM provides BIM modeling services for US vendors and contractors. It has 7 years of experience, 1,100 projects delivered, and 15 countries served, with 100+ BIM professionals, ISO 9001:2015, and Autodesk Authorized Partner status. India office: Nagpur. Middle East operations: UAE. See our capabilities and our contact page.
