---
watermark: ORIRO
disable-model-invocation: true
name: industry-construction
provider: ORIRO.ai
copyright: Copyright (c) 2026 ORIRO.ai
description: >
  Construction industry — project delivery, contracts, estimating, scheduling,
  contractor management, safety, and real estate development from the construction
  perspective. Activate for construction projects, contract types, construction
  management, or any construction industry question.
---

# Construction Industry

## Project delivery methods

### Design-Bid-Build (traditional)

Architect designs completely → competitive bid from contractors → lowest responsive bidder wins.
**Advantages:** Clear scope, competitive pricing, owner has control.
**Disadvantages:** Slow (sequential), no contractor input during design, change orders expensive.

### Design-Build

One entity responsible for design and construction.
**Advantages:** Single point of responsibility, faster, contractor input improves constructability.
**Disadvantages:** Less owner control of design, harder to compare bids.

### Construction Manager at Risk (CM@R)

CM hired early to advise, then takes over construction for guaranteed maximum price (GMP).
**Advantages:** Early CM involvement improves schedule and cost. GMP protects owner.

### CMAR vs. Owner's Representative

Owner's Rep: Represents owner's interest, does not self-perform. Watches over everyone.
CM@R: Takes financial risk on delivering for GMP. Has skin in the game.

## Construction contracts

### Lump sum (fixed price)

Contractor delivers scope for fixed price. Risk on contractor for scope creep.
Use when: Scope is well-defined. Incentivizes efficiency but invites value engineering.

### Cost plus

Owner pays actual costs plus fee (percentage or fixed). Owner bears cost risk.
Use when: Scope is uncertain. Fast track required. Owner and contractor have strong relationship.

### Unit price

Pay per unit of work performed (per cubic yard, per linear foot). Good for quantities-uncertain work.

### Change orders

Formal documentation of scope changes with cost and schedule impacts.
Never allow work to proceed without signed change order (or at least email authorization).
Change order markup: Typically 10-15% overhead + 5-10% profit on direct costs.

## Cost estimating

**Conceptual estimate:** Order of magnitude, +/- 30%. Based on $$/SF or comparable projects.
**Schematic design estimate:** +/- 20%. Based on preliminary drawings.
**Design development estimate:** +/- 10%. More complete drawings.
**Construction documents estimate:** +/- 5%. Complete drawings. Basis for bid.

**Cost drivers:** Labor (30-40%), Materials (50-60%), Equipment, Subcontractors, Overhead, Profit.
**Owner's contingency:** 5-10% for scope changes. Separate from contractor's contingency.
**Construction contingency (design uncertainty):** 5-15% depending on design completeness.

## Safety (OSHA)

Construction: Highest fatal injury rate of any major industry sector.
**Fatal Four:** Falls (largest cause), Struck-by, Caught-in/between, Electrocution.
**Fall protection at 6 feet.** Scaffolding rules. Excavation protection.
**Site safety plan:** Required on most projects. Job hazard analysis for each task.
**Morning toolbox talks:** Daily safety briefings. Documented.

Sources: AGC (agc.org — free resources), OSHA Construction Safety (osha.gov — free), AIA Contract Documents (principles), RS Means (cost estimating industry standard)