MasterFormat Division 31: Earthwork

Division 31 covers site earthwork—clearing, grading, excavation, fill, soil stabilization, and erosion control that prepare the ground for construction. Learn how Division 31 organizes specification sections, connects to UniFormat and OmniClass, and how The Construction Standard provides licensed access to authoritative, edition-aware Division 31 data through CSI Dynamic Standards.

MasterFormat Division 31 organizes the specification sections, cost codes, and work results for earthwork across the construction industry. As part of CSI's consensus-based classification system, Division 31 provides the authoritative structure that specifiers, estimators, contractors, and software platforms use to organize earthwork work.

What Division 31 Covers

Division 31 covers site earthwork—clearing, grading, excavation, fill, soil stabilization, and erosion control that prepare the ground for construction.

This division includes site clearing, earth moving, earthwork methods, shoring and underpinning, tunneling and mining, and soil treatment.

Division 31 contains multiple levels of sections and subsections that organize this scope into a precise, consensus-based hierarchy. These sections provide the numbering backbone for project manuals, bid packages, cost databases, and BIM models. When teams reference Division 31 consistently, every document from concept estimate to closeout speaks the same language.

Licensed through The Construction Standard, CSI Dynamic Standards includes the authoritative, always-current section numbers and titles for Division 31—searchable, cross-referenced, and edition-aware.

Who Uses Division 31
  • Civil engineers designing site grading
  • Earthwork and excavation contractors
  • Geotechnical engineers specifying soil treatment
  • Environmental engineers managing erosion control

Whether you write specifications, estimate costs, coordinate BIM models, or build software that references earthwork, Division 31 numbers and titles are the shared vocabulary your work depends on.

How Division 31 Connects to Other Standards

UniFormat

Division 31 maps to UniFormat G (Sitework)—the site preparation work that precedes building construction.

OmniClass

OmniClass Table 22 (Work Results) includes earthwork results; Table 13 (Spaces by Function) covers site spaces.

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

Why Edition Awareness Matters

MasterFormat evolves through consensus-based updates. Projects that span multiple years may reference different editions. Division 31 sections may be added, renumbered, or revised between editions. Without edition awareness, teams risk referencing obsolete section numbers, creating specification conflicts, and generating RFIs that delay construction.

Licensed through The Construction Standard, CSI Dynamic Standards gives teams full edition context for Division 31—teams know which edition applies at each project milestone, what changed, and where those changes affect their work.

The Licensing Relationship

CSI—the Construction Specifications Institute—stewards Division 31 as part of MasterFormat. 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: Section numbers and titles reflect the latest CSI-approved updates
  • Edition-aware: Teams know which edition applies and what changed between releases
  • Cross-referenced: Governed relationships to UniFormat and OmniClass stay maintained
  • Integration-ready: Enterprise solutions carry Division 31 data into the tools you already use
COMMON QUESTIONS
Division 31 – Earthwork covers this division includes site clearing, earth moving, earthwork methods, shoring and underpinning, tunneling and mining, and soil treatment. It provides the authoritative section numbering used in project manuals, cost databases, bid packages, and BIM models across the construction industry.
Civil engineers designing site grading, Earthwork and excavation contractors, Geotechnical engineers specifying soil treatment, Environmental engineers managing erosion control—anyone who writes specifications, estimates costs, manages submittals, or builds software that references earthwork work results needs authoritative Division 31 section numbers and titles.
Division 31 maps to UniFormat G (Sitework)—the site preparation work that precedes building construction. OmniClass Table 22 (Work Results) includes earthwork results; Table 13 (Spaces by Function) covers site spaces. CSI Dynamic Standards includes these governed crosswalks—licensed through The Construction Standard—so teams can navigate between standards without manual remapping.
If your organization uses Division 31 section numbers, titles, or descriptions in deliverables, templates, products, or platforms that others rely on, CSI Standards licensing is necessary. The license ensures you're working with authoritative, CSI-approved data that stays current with consensus-based updates.

Ready to Get Started?

CSI Dynamic Standards includes MasterFormat, UniFormat, and OmniClass as a connected, edition-aware system. The Construction Standard provides licensed access—built for the speed of your work.

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