Construction Work Items Catalog: Guide and Examples 2026

What is a Work Breakdown Structure?

A Work Breakdown Structure (WBS) — known as "Catálogo de Conceptos" in Mexico or "Lista de Ítems" in Colombia — is the organized list of all activities in a construction project, each with its code, description, unit, quantity, and unit price.

Why Proper Organization Matters

A well-organized WBS:

Prevents duplicate or missing items

Makes cost comparison between projects easier

Enables accurate progress tracking

Facilitates clear communication with clients

Standard Structure

Level 1: Chapters

01 - Preliminaries 02 - Foundations 03 - Structure 04 - Masonry 05 - Installations 06 - Finishes

Level 2: Sub-chapters

01.01 - Site preparation 01.02 - Layout and leveling 01.03 - Temporary facilities

Level 3: Activities

01.01.01 - Brush clearing (m²) 01.01.02 - Topsoil removal (m³) 01.01.03 - Demolition (m³)

Best Practices

Use consistent coding — alphanumeric codes that follow a logical hierarchy

Standard descriptions — clear, unambiguous activity descriptions

Correct units — m², m³, kg, ml, each, lot

Include everything — don't leave activities to be "figured out later"

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