Why Value Engineering Fails When it Happens Too Late
BIM Value engineering can be effective when design decisions are still flexible. During design development (DD), owners and developers can compare structural systems, equipment sizes, material quantities, and routing strategies before everything is locked down.
Changing a major design element can, however, trigger multidisciplinary rework, coordination, review and permit revisions once the permit set is issued. .A BIM model connects design elements with quantities, specifications, and spatial relationships — making cost decisions measurable while they still matter.
The Cost of a VE Change at CD Phase versus DD Phase
Take a structural system change, for example. Changing the framing approach at DD may require revised framing plans and coordination, but it’s manageable. However, the same decision can require updates to structural, architectural, MEP and civil drawings at 90% CD.
The change can, after construction begins, become a change order involving material disruption, field coordination and schedule impacts.
What too late to change Means in a Construction Budget
The permit set finalizes many design decisions. Changes then require architect and engineer review, and in some cases, AHJ approval.
If a major change is needed at 60–90% CDs, the lowest-cost VE window is already closed. Identifying meaningful alternatives while the model is being developed should therefore be the objective.
Where BIM Enables Value Engineering Decisions
BIM Use. | What it Reveals | VE Opportunity |
Quantity take-off from model | Accurate material quantities by element | Reduce overspecified materials without compromising performance |
Clash detection and MEP routing | Inefficient routes adding material and labor | Shorten pipe, duct and conduit runs |
Structural system comparison | Alternate structural systems | Compare steel, concrete or hybrid solutions |
4D sequencing | Construction sequence and duration | Identify schedule-compression opportunities |
Energy modeling integration | System performance and modeled load | Right-size mechanical equipment |
The model should be used to compare alternatives, not simply to document a selected design.
Structural VE Opportunities the Model can Identify at DD
Material Substitution Analysis
Span and Bay Optimization
MEP VE Opportunities Visible in the Model
Equipment Sizing and System Efficiency
Routing Optimization that Reduces Material and Labor
What Owners and Developers should Request at DD Phase
The VE Review Process How to Structure it Around the Model
Conclusion
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FAQ's
The best time to conduct value engineering on a construction project is design development stage, after the concept is confirmed but before construction documents are issued. This provides the greatest flexibility for meaningful VE changes.
BIM provides quantity take-offs, alternate system comparisons, MEP routing analysis and sequencing information for evaluating cost implications before decisions are finalized.
Yes, it can be done. But CD phase VE generally requires more multidisciplinary rework and may involve permit revisions and schedule impacts, increasing costs and causing delays.
Owners should request a BIM Quantity take-off by element category and an alternate structural system comparison to establish measurable VE options.
