Bauzeit

Bauzeit, literally meaning construction time, is the duration required to complete the construction works of a building project, from the start of construction (Baubeginn) to completion (Fertigstellung). In project management, Bauzeit is a central element of the project schedule and is used to forecast resources, cash flow, and overall delivery.

Planning and measurement of Bauzeit typically relies on scheduling methods such as the critical path method (CPM) or Gantt charts. The schedule defines the sequence and duration of activities, their dependencies, and milestones, and is regularly updated with progress reports to identify slippages and adjust plans accordingly.

Several factors influence Bauzeit, including project size and complexity, site conditions, regulatory approvals, procurement and lead times for long-lead items, subcontractor availability, weather, and design changes (Nachträge). Proper coordination among trades, safety considerations, and quality controls can also impact the total duration.

Estimation and variability are inherent to Bauzeit. Estimates usually include a contingency for uncertainties. Durations can range from weeks for small renovations to years for large-scale developments; unforeseen issues can cause delays known as Bauzeitverzug. Accuracy improves with detailed planning, historical data, and risk assessment.

Management and optimization of Bauzeit involve strategies such as early planning, design for constructability, prefabrication and modular construction, parallel activities, proactive procurement, and clear contractual incentives for on-time completion. Regular monitoring uses metrics like planned-versus-actual Bauzeit, tracking of the critical path, and productivity indicators to maintain schedule integrity.