Elements in the wrong category
A curb modeled as a wall, a ceiling modeled as a floor, or a generic model family standing in for real equipment.
BIM Estimating
BIM Estimating Services: Quantities and Costs From Your Model
A building model already knows a lot about quantities: wall areas, door counts, slab volumes, duct lengths. Pulling those numbers into an estimate can save days of manual takeoff. But a model is only as good as the way it was built, and a quantity schedule exported straight from Revit can be confidently wrong.
Our BIM estimating services take quantities from your model, check them against how the building will actually be built, fill in what the model leaves out, and attach costs. The result is a 5D estimate you can trust and update as the design changes.
Model-based quantitiesChecked against the drawings
Excel + PDFWith marked-up drawings
ZIP-code pricedLocal material and labor rates
24 to 48 hoursTypical turnaround
What 5D BIM Estimating Means
In BIM terms, 3D is geometry, 4D adds time (schedule), and 5D adds cost. A 5D estimate links each model element (a wall type, a beam, a duct run) to quantities and unit costs, so the estimate is tied to the design rather than to a separate set of measurements.
In practice, that means:
- Quantities come from the model rather than being measured again from 2D sheets
- Each estimate line can be traced back to model elements
- When the model changes, the affected quantities and costs can be updated
We Check the Model Before We Trust It
Most problems with model-based estimating come from how the model was built, not the software. Before using any quantities, we look for:
Duplicate or overlapping elements
Two walls in the same place, or slabs that overlap at transitions.
Layer and assembly issues
Compound walls where finishes are modeled as separate walls, or not modeled at all.
Unjoined geometry
Walls and floors that don't join cleanly, which distorts areas and volumes.
Placeholder content
Elements left over from earlier design options.
Anything that doesn't make sense is cross-checked against the 2D sheets. We report what we found so your design or VDC team can correct the model.
What's Usually Missing From a Model
Even a well-built model rarely includes everything that costs money. Typical items we take off separately:
- Reinforcing steel and embeds
- Blocking, backing, and fire blocking
- Fasteners, connectors, and anchors
- Sealants, flashing, and waterproofing details
- Temporary works, formwork, and shoring
- Small-diameter piping, conduit, and wiring
- Firestopping at penetrations
- Items covered only in specifications
A good BIM estimate combines model quantities with targeted 2D takeoffs for these.
How LOD Affects the Estimate
Level of Development (LOD) describes how complete and reliable each model element is.
LOD 100 to 200
Approximate size, shape, and location. Good for conceptual and budget pricing using assemblies or allowances. Preliminary estimating →
LOD 300
Specific size, shape, quantity, and location. Most quantities can be taken directly.
LOD 400
Fabrication-level detail. Quantities are very close to what's installed.
Models often mix levels: structure at LOD 300 while interiors sit at LOD 200. We price each part at the level the model supports and say so in the estimate.
Mapping Model Elements to Costs
Model categories don't line up neatly with estimate structure. One Revit wall type might contain studs, insulation, gypsum board, and paint: four trades and several CSI divisions. We map model elements and their layers to cost codes, so the estimate is organized by CSI division, UniFormat, or your own code structure.
Updating Costs as the Model Changes
Because quantities are linked to model elements, revised models can be compared to earlier versions. That lets us report what changed (added walls, deleted doors, larger slabs) and the cost impact of each design revision. This is useful in design development, where cost checks at each milestone keep the design on budget. Budget estimating →
Software and File Types
- Autodesk Revit (RVT)
- IFC exports from other authoring tools
- Navisworks (NWD/NWC) for federated models
- 2D sheets (PDF) for cross-checking and supplemental takeoff
Who Uses BIM Estimating
General contractors and design-build firms
pricing projects where a model is part of the bid documents
Owners
on projects with BIM requirements, wanting cost tracking tied to the model
Architects and engineers
checking design options against budget
Trade contractors
pulling quantities from coordinated MEP or structural models MEP estimating →
Process
How It Works
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01
Share the model
and the matching 2D drawing set and specs.
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02
Model review
We check model quality and tell you what can be taken directly and what needs supplemental takeoff.
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03
Quote and schedule
You get a fee and delivery date.
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04
Estimate
Quantities are extracted, validated, supplemented, and priced.
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05
Updates
When the model is revised, we can compare versions and update the estimate.
Excel + PDFWith marked-up drawings
Deliverables
What You Receive
- A cost estimate organized by CSI division, UniFormat, or your codes
- Quantity reports traced to model elements
- A model review memo listing issues found
- A list of items taken off from 2D sheets
- Assumptions and exclusions
- Excel and PDF files
FAQ
Frequently Asked Questions
What is 5D BIM?
5D BIM links cost information to a 3D building model, so quantities and costs come from the model and can be updated when the design changes.
Is BIM estimating more accurate than 2D takeoff?
It can be faster and more consistent when the model is well built. When the model has errors or missing elements, it can be less accurate unless the quantities are checked. That's why we validate the model first.
Can you estimate from a Revit model alone?
We can extract most quantities from the model, but we also use the drawings and specifications to catch what isn't modeled.
What LOD does my model need to be?
Any LOD can be priced, but the method changes. Early-stage models support assembly-based estimates; LOD 300 and above support detailed takeoffs.
Ready to Get Started?
Get an Estimate That Matches Your Model
Share your model and drawings. We'll review the model, tell you what it supports, and quote the estimate.