Know where every quantity came from.
We extract model-based quantities through controlled rules and explicit scope mapping. Each total remains traceable to elements, assumptions and exclusions.
A schedule total is not automatically a valid take-off.
Model-based quantity take-off converts classified elements and parameters into measurable work quantities. Lengths, areas, volumes, counts and weights are extracted according to stated rules and mapped to the relevant cost or bill item.
Models are rarely authored solely for measurement. Elements may be split differently from work items, assemblies may contain duplicate measurable layers, and temporary or minor scope may not be modelled at all.
CNE reviews model suitability before extraction and reconciles geometry with the measurement basis. Unmodelled scope, allowances and exclusions remain explicit so the take-off can be checked and updated rather than accepted as a black-box total.
Measured, mapped and auditable
Element completeness, classification, duplication, parameters and LOD are reviewed before quantities are treated as reliable.
Units, deductions, openings, waste boundaries and treatment of layered or composite elements are defined by work item.
Model categories, types and classifications are connected to the agreed cost or bill structure using controlled rules.
Counts, lengths, areas, volumes and other measures are produced from the approved model revision and calculation basis.
Items not represented adequately in BIM are recorded separately with their source, assumption and required allowance.
CNE hands over quantity tables, model references, rules, exclusions and reconciliation notes for review and update.
Quantities with a visible basis
We agree how each item will be measured before extracting totals from inconsistent model structures.
Unmodelled and unsuitable scope is separated from model-derived quantities instead of buried inside an unexplained allowance.
Controlled mappings let later take-offs show genuine scope change rather than differences in extraction method.
Turn your model into a defensible quantity basis.
Send us the model, work-item structure and measurement requirements. CNE will assess readiness and prepare a traceable quantity take-off.