TL;DR
A Gantt chart in construction is a horizontal bar chart that maps every task on a project against time, showing start dates, end dates, durations, dependencies, and the critical path. It’s the industry-standard way to plan, track, and communicate a build schedule from foundations through handover. Modern construction Gantt tools add weather alerts, resource loading, dependency cascades, and mobile updates so site supervisors can see the impact of delays in real time. Built Simple’s Builder ($199/mo) and Pro ($399/mo) tiers include full Gantt scheduling with dependency management.
Key Stats
- Invented 1910s — named after Henry Gantt; still the most widely-used construction scheduling format more than a century later.
- 4 things every Gantt task needs — start date, end date (or duration), assigned trade, dependency on prior tasks.
- Critical path — the longest sequence of dependent tasks; any delay on this path delays the entire project.
- Weather impact — AU residential builds typically lose 8-15 days/year to rain on outdoor trades; modern Gantts integrate weather alerts to forecast the cascade.
- Mobile-first — site supervisors update tasks from a phone; static printed Gantts are obsolete.
A Gantt chart is a visual project scheduling tool that shows tasks as horizontal bars across a timeline. Each bar represents a task, its start date, duration, and end date. In construction, Gantt charts are used to plan and track every stage of a build.
Why Builders Use Gantt Charts
- See the entire project timeline at a glance
- Identify dependencies — which tasks must finish before others can start
- Spot clashes — two trades scheduled for the same space at the same time
- Track progress — see which tasks are on time, late, or complete
- Communicate with clients — show them where the project is at
- Manage delays — when one task slips, see the cascade effect on everything downstream
Example: Residential Build Gantt Chart
A typical residential build Gantt chart includes these phases:
- Site preparation (1-2 weeks) — clearing, excavation, services
- Slab/Foundation (2-3 weeks) — formwork, pour, cure
- Framing (2-4 weeks) — walls, roof structure, bracing
- Lockup (3-4 weeks) — cladding, windows, doors, roofing
- Rough-in (2-3 weeks) — plumbing, electrical, HVAC
- Fixing (4-6 weeks) — plaster, cabinetry, tiling, painting
- Completion (1-2 weeks) — final fix, clean, landscaping, handover
Gantt Charts vs Spreadsheets
Many builders still schedule with spreadsheets or whiteboards. The problem: when one task changes, you have to manually update everything else. A Gantt chart with task dependencies automatically adjusts downstream tasks when something moves.
Frequently Asked Questions
What software makes Gantt charts for construction?
Built Simple includes Gantt scheduling with drag-and-drop task management, dependencies, and weather alerts. Other options include Microsoft Project (complex), Buildertrend (expensive), or generic tools like Smartsheet (not construction-specific).
What are dependencies in a Gantt chart?
Dependencies define which tasks must be completed before another can start. For example: you can’t start framing until the slab has cured. If the slab is delayed by 3 days, framing and everything after it automatically shifts by 3 days.
Do I need a Gantt chart for small projects?
Even a bathroom renovation with 5-8 trades benefits from a simple Gantt chart. It shows the client when each trade is coming and helps you coordinate so plumbers don’t show up the same day as tilers.
Manage your builds with Built Simple
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Related Reading
Looking for the full picture? Check out our guide to the best construction scheduling software in Australia for 2026, including detailed comparisons of Gantt features, mobile apps, and pricing.
