Sequential stages where each gates the next
Construction follows a critical path of dependent stages. Foundation must cure and be inspected before framing can begin. Framing establishes the structure and roof, which must be weather-tight before interior work. The building envelope (sheathing, cladding, windows) must be sealed before drywall and finishes.
MEP (mechanical, electrical, plumbing) rough-in happens after framing but before drywall, allowing lines to be run inside walls. Once drywall covers the frame, changing electrical outlet locations or adding plumbing requires expensive demolition. Inspections occur at each stage, and failed inspections halt the next stage until corrections are made.
Parallel work and schedule compression strategies
Some tasks run in parallel (foundation concrete curing for 7 days while permits are finalized for the next stage). Smart scheduling overlaps preparatory work to compress overall timeline. However, the critical path defines minimum duration; few stages can meaningfully happen earlier without rework.
Schedule compression occurs through added crew (faster framing) or faster-setting materials (accelerated concrete cures, modular components). However, rushing leads to quality issues and rework, often negating time savings. Most efficient projects balance pace with quality by careful critical-path management and sufficient contingency buffer.