OmniClass Table 31: Phases

OmniClass Table 31 – Phases provides lifecycle classification that spans design, construction, and operations. As part of CSI's comprehensive classification system, Table 31 delivers the taxonomy that BIM models, FM systems, and construction platforms need to organize phases data authoritatively.

OmniClass Table 31 classifies project phases—the stages of planning, design, construction, and operation that organize work chronologically across the project and facility lifecycle.

This table classifies phases including conception, planning, schematic design, design development, construction documents, bidding and negotiation, construction, substantial completion, and facility operation and maintenance.

Table 31 contains a detailed, consensus-based taxonomy that organizes this scope into categories and subcategories professionals can apply across projects. These classifications provide a shared vocabulary across the construction lifecycle. When teams apply Table 31 classifications consistently, data flows cleanly from design through construction into decades of facility operations.

Licensed through The Construction Standard, CSI Dynamic Standards includes the authoritative, always-current Table 31 classifications—searchable, cross-referenced to MasterFormat and UniFormat, and edition-aware.

Table 31 provides the temporal framework that organizes all other OmniClass classifications chronologically. It defines when each type of classification is most relevant—from element-based cost modeling in early phases to work-result-based specification in later phases.

Who Uses Table 31

• Project managers organizing work by phase
• Owners tracking project progress through lifecycle stages
• Software platforms structuring workflows by phase
• Researchers analyzing construction project delivery

Whether you tag BIM models, manage building assets, build construction software, or organize project data, Table 31 provides the authoritative classification that keeps your work consistent with the broader industry.

MasterFormat

Different MasterFormat divisions become relevant at different Table 31 phases—Division 00 during bidding, Divisions 01–49 during construction, and Division 01 closeout sections during substantial completion.

UniFormat

UniFormat element-based cost modeling is most relevant during Table 31 early phases (conception through design development), before transitioning to MasterFormat-organized documentation in later phases.

These connections are maintained by CSI through governed relationships—not assembled ad hoc by individual project teams. Through The Construction Standard, licensed access to CSI Dynamic Standards gives teams these crosswalks so they can navigate between lifecycle categories, building elements, and specification sections without manual remapping.

Why OmniClass Matters for Long-Term Value

Buildings operate for decades. The classification applied during design and construction must carry into operations, maintenance, and capital renewal. OmniClass Table 31 provides the lifecycle layer that connects design-phase decisions to operations-phase reality—ensuring that structured data doesn't lose its value at handover.

Without authoritative lifecycle classification, FM teams rebuild taxonomy from scratch. Equipment histories lose their connection to original specifications. Capital renewal budgets lack the structured data needed for systematic planning. OmniClass Table 31 prevents these disconnects by providing classification that was designed to span the full lifecycle.

The Licensing Relationship

CSI—the Construction Specifications Institute—stewards OmniClass Table 31 as part of the OmniClass standard. CSI Dynamic Standards includes MasterFormat, UniFormat, and OmniClass as a connected, edition-aware system. The Construction Standard provides licensed access to CSI Dynamic Standards:

• Always current: Classifications reflect the latest CSI-approved updates
• Edition-aware: Teams know which edition applies and what changed between releases
• Cross-referenced: Governed relationships to MasterFormat and UniFormat stay maintained
• Integration-ready: Enterprise solutions carry Table 31 data into the tools you already use