Subcontractors and trade contractors
Kind: Who supply specialized knowledge and labor
Tag: specialized scope, crews, field execution
Role in the system
Trade contractors are where much of the physical building expertise lives. They also do plenty of information work: estimating, interpreting drawings, proposing scope clarifications, sequencing crews, and documenting what was installed.
Delivery-model nuance
- New construction: Trades work from complete drawings on a clean site with predictable conditions and quantities. Sequencing is standard (foundation → frame → rough MEP → insulation → drywall → finishes). Crews and scopes are larger.
- Renovation: Trades work within existing structures where conditions are partly unknown until surfaces are opened. Crews tend to be smaller and more multi-skilled. Work is often phased around occupied spaces, requiring temporary protections, daily cleanup, and coordination with occupant schedules. Trades may need to match existing finishes, work around legacy systems, and solve problems discovered during Selective demolition. Return trips are more common because concealed-condition discoveries can invalidate initial scope assumptions. Licensed trades (electrical, plumbing) frequently trigger the need for trade-specific permits even on projects where the overall building permit is minor.
Personas
| Persona | Type | Role |
|---|---|---|
| Trade estimator | Info + decisions | Prices a specific scope by reading documents and converting them into labor, materials, and exclusions. |
| Trade project manager | Info + decisions | Coordinates procurement, schedule commitments, and problem resolution for the trade firm. |
| Foreman / first-line supervisor | Hybrid | Allocates crews, reads plans, solves field issues, documents progress, and communicates with GC and inspectors. |
| Carpenter | Hands-on | Builds frameworks and structural / finish elements from plans and dimensions. |
| Electrician / plumber | Hands-on + licensed scope | Install core building systems that are frequently inspected and regulated. |
| Laborer / helper | Hands-on | Moves material, supports trades, and keeps work areas functioning. |
Receives / consumes
- Bid packages and drawings
- Subcontracts and site schedule
- Field instructions / clarifications
- Inspection timing
- Material release dates
Produces / sends
- Quotes
- Crew plans
- Installed work
- Change requests
- Inspection-ready scope
- Punch completion
Key decisions
- What is included / excluded in trade price
- How to crew the work
- When to ask for clarification
- How to recover when sequence slips
Related terms
Related notes
- Actors overview, Process overview, Information flows, Major renovation - addition, Targeted renovation
Evidence
- S15 - BLS Occupational Outlook Handbook - Cost estimators, S20 - BLS Occupational Outlook Handbook - Carpenters, S21 - BLS Occupational Outlook Handbook - Electricians, S22 - BLS Occupational Outlook Handbook - Plumbers, pipefitters, and steamfitters, S23 - BLS Occupational Outlook Handbook - Construction laborers and helpers, S32 - ONET - First-line supervisors of construction trades