Construction Scheduling
Critical Path Method for Contractors
NCA licensed scheduling specialists with 15+ years experience in construction scheduling and CPM analysis across Kenya. On-time project delivery.
NCA Licensed
15+ Years
Scheduling Specialists
What is Construction Scheduling?
Construction scheduling is the process of planning and organizing construction activities over time. It ensures work proceeds in logical order, resources are available when needed, and the project completes on time.
In Kenya's construction industry, effective scheduling must account for rainy seasons, material delivery times, regulatory approval periods, and labor availability.
📊 Key Fact: Projects without proper scheduling experience 30-100% schedule delays in Kenya. Professional scheduling typically costs 0.5-2% of project value but prevents delays costing 10-50x more in extended preliminaries, financing costs, and lost revenue.
Before scheduling begins, ensure you have completed your project management planning and understand your BOQ preparation for accurate activity estimation.
Critical Path Method (CPM)
The Critical Path Method is a scheduling technique that identifies the sequence of activities determining the shortest possible project duration. It is the industry standard for construction scheduling.
Key CPM Concepts
- Critical Path: Longest path through the network, determines project duration
- Float/Slack: Time an activity can be delayed without delaying project
- Zero Float: Activities on critical path have no float
- Forward Pass: Calculates early start and early finish dates
- Backward Pass: Calculates late start and late finish dates
CPM Analysis Steps
- List all project activities
- Estimate activity durations
- Determine activity dependencies
- Draw network diagram
- Perform forward pass (early dates)
- Perform backward pass (late dates)
- Calculate float for each activity
- Identify critical path (zero float)
- Calculate total project duration
💡 CPM Insight: Activities on the critical path cannot be delayed without delaying the project. Focus resources on critical activities and monitor them closely.
Creating a Construction Schedule
Creating an effective construction schedule requires systematic planning and realistic estimation.
Schedule Development Steps
- Define Activities: Break project into specific, measurable tasks
- Estimate Durations: Based on quantity, productivity, and resources
- Determine Dependencies: Which activities must precede others
- Create Network Diagram: Show activity relationships
- Assign Resources: Labor, equipment, materials to activities
- Perform CPM Analysis: Calculate dates and float
- Optimize: Adjust for resource availability and cost
- Baseline: Approve schedule for progress measurement
Duration Estimation
- Quantity: Amount of work to be done
- Productivity: Output per crew-day
- Crew Size: Number of workers assigned
- Formula: Duration = Quantity ÷ (Productivity × Crew Size)
Dependency Types
- Finish-to-Start: Activity B cannot start until A finishes (most common)
- Start-to-Start: Activity B cannot start until A starts
- Finish-to-Finish: Activity B cannot finish until A finishes
- Start-to-Finish: Activity B cannot finish until A starts (rare)
Float and Slack
Float (also called slack) is the amount of time an activity can be delayed without delaying the project completion date. Understanding float is essential for effective schedule management.
Types of Float
- Total Float: Time activity can be delayed without delaying project
- Free Float: Time activity can be delayed without delaying successor activities
- Critical Activities: Have zero float, cannot be delayed
- Near-Critical Activities: Have small float, require close monitoring
Float Calculation
Total Float = Late Start - Early Start
or
Total Float = Late Finish - Early Finish
or
Total Float = Late Finish - Early Finish
Float Management
- Use float to optimize resource allocation
- Do not consume float unnecessarily
- Monitor near-critical activities
- Understand that float is shared: Using float on one activity affects others
⚠️ Important: Float is a shared resource. Consuming float on non-critical activities reduces flexibility for the entire project.
Handling Delays in Construction Schedules
Delays are common in construction projects. Effective delay management minimizes impact and protects project completion.
Delay Classification
- Excusable Delays: Weather, client delay, force majeure (entitled to extension)
- Non-Excusable Delays: Contractor fault, poor planning (no extension)
- Compensable Delays: Client-caused delays with cost compensation
- Non-Compensable Delays: Excusable but no cost compensation
Delay Mitigation Options
- Crash: Add resources to critical activities (increases cost)
- Fast-Track: Perform activities in parallel (increases risk)
- Re-sequence: Change activity order
- Overtime: Extended working hours
- Negotiate: Extension of time or acceleration costs
Delay Documentation
- Keep detailed records of delays
- Notify client promptly per contract requirements
- Submit claims with supporting documentation
- Maintain contemporaneous records: Daily reports, photographs, correspondence
For contract administration guidance, see our guide on project planning and contracts.
Scheduling Software
Scheduling software automates CPM calculations, resource leveling, and progress tracking. Selection depends on project size, budget, and team familiarity.
Popular Scheduling Software
| Software | Best For | Cost |
|---|---|---|
| Microsoft Project | Small-medium projects | Moderate |
| Primavera P6 | Large complex projects | High |
| Procore | Collaboration, cloud | Subscription |
| Smartsheet | Simple projects | Low |
| Excel | Basic schedules | Free |
Software Selection Factors
- Project size and complexity
- Budget
- Team familiarity and training
- Client requirements: Some clients specify software
Scheduling Costs in Kenya: 2026 Guide
Professional scheduling services ensure realistic timelines and effective delay management. The following provides current market ranges for budgeting.
| Service | Cost Range (KES) | Notes |
|---|---|---|
| Schedule Development | 50,000-200,000 | Initial schedule creation |
| CPM Analysis | 30,000-100,000 | Network analysis |
| Schedule Updates | 20,000-50,000/month | Monthly progress updates |
| Delay Analysis | 100,000-500,000 | Forensic analysis |
| Full Scheduling Service | 100,000-500,000 | Project duration |
Scheduling Cost Factors
- Project size and complexity
- Number of activities
- Update frequency
- Software requirements: Primavera P6 more expensive than MS Project
For accurate scheduling pricing, use our cost estimate calculator or WhatsApp us your requirements.
Need Construction Scheduling for Your Project?
Trust Partners provides professional construction scheduling and CPM analysis across Kenya. Schedule development, updates, and delay analysis.
WhatsApp Us 📞 Tap to Call: +254 718 68 69 67Frequently Asked Questions
What is construction scheduling?
Construction scheduling is the process of planning and organizing construction activities over time. It involves: Identifying activities required to complete the project, Estimating activity durations, Determining activity dependencies, Sequencing activities logically, Assigning resources, and Establishing the project timeline. Effective scheduling ensures: Work proceeds in logical order, Resources are available when needed, Project completes on time, and Delays are minimized. In Kenya, scheduling must account for: Rainy seasons, Material delivery times, and Regulatory approval periods.
What is the critical path method (CPM)?
The Critical Path Method (CPM) is a scheduling technique that identifies the sequence of activities determining the shortest possible project duration. Key concepts: Critical path: Longest path through the network, determines project duration. Float/slack: Time an activity can be delayed without delaying project. Zero float: Activities on critical path have no float. Forward pass: Calculates early start and early finish dates. Backward pass: Calculates late start and late finish dates. CPM analysis identifies: Activities that cannot be delayed, Where to focus resources, and Impact of delays on project completion. Software like Primavera P6 and Microsoft Project automate CPM calculations.
How do you create a construction schedule?
Creating a construction schedule: Define activities: Break project into specific tasks. Estimate durations: Time required for each activity based on quantity and productivity. Determine dependencies: Which activities must precede others. Create network diagram: Show activity relationships. Perform forward pass: Calculate early start (ES) and early finish (EF). Perform backward pass: Calculate late start (LS) and late finish (LF). Calculate float: LS - ES or LF - EF. Identify critical path: Activities with zero float. Review and optimize: Adjust resources, logic, or durations. Software: Microsoft Project, Primavera P6, or Excel for simple projects.
What is float in construction scheduling?
Float (also called slack) is the amount of time an activity can be delayed without delaying the project completion date. Types of float: Total float: Time activity can be delayed without delaying project. Free float: Time activity can be delayed without delaying successor activities. Critical activities: Have zero float, cannot be delayed. Near-critical activities: Have small float, require close monitoring. Float calculation: Total Float = Late Start - Early Start, or Total Float = Late Finish - Early Finish. Float management: Use float to optimize resource allocation, Do not consume float unnecessarily, Monitor near-critical activities, and Understand that float is shared on paths.
How do you handle delays in construction schedules?
Handling construction delays: Identify delay cause: Excusable (weather, client delay) vs. non-excusable (contractor fault). Assess impact: Which activities affected, Critical path impact, Overall project delay. Mitigation options: Crash: Add resources to critical activities (increases cost). Fast-track: Perform activities in parallel (increases risk). Re-sequence: Change activity order. Overtime: Extended working hours. Negotiate: Extension of time or acceleration costs. Documentation: Keep detailed records of delays, Notify client promptly, and Submit claims per contract requirements. Prevention: Realistic initial schedule, Regular monitoring, Early problem identification.
What scheduling software is used in Kenya?
Scheduling software used in Kenya: Microsoft Project: Widely used, moderate cost, good for small to medium projects. Primavera P6: Industry standard for large projects, expensive, powerful features. Procore: Cloud-based, good for collaboration, subscription pricing. Smartsheet: Simple, spreadsheet-like, good for small projects. Excel: Basic scheduling, manual updating, free. Selection factors: Project size and complexity, Budget, Team familiarity, and Client requirements. Training: Essential for effective software use. Trust Partners uses industry-standard software for professional scheduling services.
How long should a construction schedule be?
Construction schedule duration depends on: Project size and complexity, Resource availability, Site conditions, and Regulatory requirements. Typical durations in Kenya: Small house (2-3 bedroom): 6-12 months. Medium house (4-5 bedroom): 12-18 months. Apartment block (4-8 units): 18-30 months. Commercial building: 24-48 months. High-rise building: 36-60+ months. Schedule should include: Realistic activity durations, Contingency for weather and delays, Time for regulatory approvals, and Commissioning and handover. Unrealistically short schedules lead to: Rushed work, Quality problems, Safety risks, and Cost overruns.
What is resource leveling in construction scheduling?
Resource leveling is adjusting the schedule to resolve resource conflicts and smooth resource usage. Purpose: Avoid over-allocation of resources (crew, equipment), Smooth resource usage over time, Reduce resource peaks and valleys. Methods: Delay activities within their float, Split activities into smaller segments, Add resources to critical activities, or Extend project duration if necessary. Trade-offs: Resource leveling may extend project duration, Increased duration may increase costs, But reduces resource idle time and overtime. Software: Microsoft Project and Primavera P6 have resource leveling features. Effective resource leveling improves efficiency and reduces costs.
Construction Scheduling
Critical Path Method for Contractors
NCA licensed scheduling specialists with 15+ years experience in construction scheduling and CPM analysis across Kenya. On-time project delivery.
NCA Licensed
15+ Years
Scheduling Specialists
What is Construction Scheduling?
Construction scheduling is the process of planning and organizing construction activities over time. It ensures work proceeds in logical order, resources are available when needed, and the project completes on time.
In Kenya's construction industry, effective scheduling must account for rainy seasons, material delivery times, regulatory approval periods, and labor availability.
📊 Key Fact: Projects without proper scheduling experience 30-100% schedule delays in Kenya. Professional scheduling typically costs 0.5-2% of project value but prevents delays costing 10-50x more in extended preliminaries, financing costs, and lost revenue.
Before scheduling begins, ensure you have completed your project management planning and understand your BOQ preparation for accurate activity estimation.
Critical Path Method (CPM)
The Critical Path Method is a scheduling technique that identifies the sequence of activities determining the shortest possible project duration. It is the industry standard for construction scheduling.
Key CPM Concepts
- Critical Path: Longest path through the network, determines project duration
- Float/Slack: Time an activity can be delayed without delaying project
- Zero Float: Activities on critical path have no float
- Forward Pass: Calculates early start and early finish dates
- Backward Pass: Calculates late start and late finish dates
CPM Analysis Steps
- List all project activities
- Estimate activity durations
- Determine activity dependencies
- Draw network diagram
- Perform forward pass (early dates)
- Perform backward pass (late dates)
- Calculate float for each activity
- Identify critical path (zero float)
- Calculate total project duration
💡 CPM Insight: Activities on the critical path cannot be delayed without delaying the project. Focus resources on critical activities and monitor them closely.
Creating a Construction Schedule
Creating an effective construction schedule requires systematic planning and realistic estimation.
Schedule Development Steps
- Define Activities: Break project into specific, measurable tasks
- Estimate Durations: Based on quantity, productivity, and resources
- Determine Dependencies: Which activities must precede others
- Create Network Diagram: Show activity relationships
- Assign Resources: Labor, equipment, materials to activities
- Perform CPM Analysis: Calculate dates and float
- Optimize: Adjust for resource availability and cost
- Baseline: Approve schedule for progress measurement
Duration Estimation
- Quantity: Amount of work to be done
- Productivity: Output per crew-day
- Crew Size: Number of workers assigned
- Formula: Duration = Quantity ÷ (Productivity × Crew Size)
Dependency Types
- Finish-to-Start: Activity B cannot start until A finishes (most common)
- Start-to-Start: Activity B cannot start until A starts
- Finish-to-Finish: Activity B cannot finish until A finishes
- Start-to-Finish: Activity B cannot finish until A starts (rare)
Float and Slack
Float (also called slack) is the amount of time an activity can be delayed without delaying the project completion date. Understanding float is essential for effective schedule management.
Types of Float
- Total Float: Time activity can be delayed without delaying project
- Free Float: Time activity can be delayed without delaying successor activities
- Critical Activities: Have zero float, cannot be delayed
- Near-Critical Activities: Have small float, require close monitoring
Float Calculation
Total Float = Late Start - Early Start
or
Total Float = Late Finish - Early Finish
or
Total Float = Late Finish - Early Finish
Float Management
- Use float to optimize resource allocation
- Do not consume float unnecessarily
- Monitor near-critical activities
- Understand that float is shared: Using float on one activity affects others
⚠️ Important: Float is a shared resource. Consuming float on non-critical activities reduces flexibility for the entire project.
Handling Delays in Construction Schedules
Delays are common in construction projects. Effective delay management minimizes impact and protects project completion.
Delay Classification
- Excusable Delays: Weather, client delay, force majeure (entitled to extension)
- Non-Excusable Delays: Contractor fault, poor planning (no extension)
- Compensable Delays: Client-caused delays with cost compensation
- Non-Compensable Delays: Excusable but no cost compensation
Delay Mitigation Options
- Crash: Add resources to critical activities (increases cost)
- Fast-Track: Perform activities in parallel (increases risk)
- Re-sequence: Change activity order
- Overtime: Extended working hours
- Negotiate: Extension of time or acceleration costs
Delay Documentation
- Keep detailed records of delays
- Notify client promptly per contract requirements
- Submit claims with supporting documentation
- Maintain contemporaneous records: Daily reports, photographs, correspondence
For contract administration guidance, see our guide on project planning and contracts.
Scheduling Software
Scheduling software automates CPM calculations, resource leveling, and progress tracking. Selection depends on project size, budget, and team familiarity.
Popular Scheduling Software
| Software | Best For | Cost |
|---|---|---|
| Microsoft Project | Small-medium projects | Moderate |
| Primavera P6 | Large complex projects | High |
| Procore | Collaboration, cloud | Subscription |
| Smartsheet | Simple projects | Low |
| Excel | Basic schedules | Free |
Software Selection Factors
- Project size and complexity
- Budget
- Team familiarity and training
- Client requirements: Some clients specify software
Scheduling Costs in Kenya: 2026 Guide
Professional scheduling services ensure realistic timelines and effective delay management. The following provides current market ranges for budgeting.
| Service | Cost Range (KES) | Notes |
|---|---|---|
| Schedule Development | 50,000-200,000 | Initial schedule creation |
| CPM Analysis | 30,000-100,000 | Network analysis |
| Schedule Updates | 20,000-50,000/month | Monthly progress updates |
| Delay Analysis | 100,000-500,000 | Forensic analysis |
| Full Scheduling Service | 100,000-500,000 | Project duration |
Scheduling Cost Factors
- Project size and complexity
- Number of activities
- Update frequency
- Software requirements: Primavera P6 more expensive than MS Project
For accurate scheduling pricing, use our cost estimate calculator or WhatsApp us your requirements.
Need Construction Scheduling for Your Project?
Trust Partners provides professional construction scheduling and CPM analysis across Kenya. Schedule development, updates, and delay analysis.
WhatsApp Us 📞 Tap to Call: +254 718 68 69 67Frequently Asked Questions
What is construction scheduling?
Construction scheduling is the process of planning and organizing construction activities over time. It involves: Identifying activities required to complete the project, Estimating activity durations, Determining activity dependencies, Sequencing activities logically, Assigning resources, and Establishing the project timeline. Effective scheduling ensures: Work proceeds in logical order, Resources are available when needed, Project completes on time, and Delays are minimized. In Kenya, scheduling must account for: Rainy seasons, Material delivery times, and Regulatory approval periods.
What is the critical path method (CPM)?
The Critical Path Method (CPM) is a scheduling technique that identifies the sequence of activities determining the shortest possible project duration. Key concepts: Critical path: Longest path through the network, determines project duration. Float/slack: Time an activity can be delayed without delaying project. Zero float: Activities on critical path have no float. Forward pass: Calculates early start and early finish dates. Backward pass: Calculates late start and late finish dates. CPM analysis identifies: Activities that cannot be delayed, Where to focus resources, and Impact of delays on project completion. Software like Primavera P6 and Microsoft Project automate CPM calculations.
How do you create a construction schedule?
Creating a construction schedule: Define activities: Break project into specific tasks. Estimate durations: Time required for each activity based on quantity and productivity. Determine dependencies: Which activities must precede others. Create network diagram: Show activity relationships. Perform forward pass: Calculate early start (ES) and early finish (EF). Perform backward pass: Calculate late start (LS) and late finish (LF). Calculate float: LS - ES or LF - EF. Identify critical path: Activities with zero float. Review and optimize: Adjust resources, logic, or durations. Software: Microsoft Project, Primavera P6, or Excel for simple projects.
What is float in construction scheduling?
Float (also called slack) is the amount of time an activity can be delayed without delaying the project completion date. Types of float: Total float: Time activity can be delayed without delaying project. Free float: Time activity can be delayed without delaying successor activities. Critical activities: Have zero float, cannot be delayed. Near-critical activities: Have small float, require close monitoring. Float calculation: Total Float = Late Start - Early Start, or Total Float = Late Finish - Early Finish. Float management: Use float to optimize resource allocation, Do not consume float unnecessarily, Monitor near-critical activities, and Understand that float is shared on paths.
How do you handle delays in construction schedules?
Handling construction delays: Identify delay cause: Excusable (weather, client delay) vs. non-excusable (contractor fault). Assess impact: Which activities affected, Critical path impact, Overall project delay. Mitigation options: Crash: Add resources to critical activities (increases cost). Fast-track: Perform activities in parallel (increases risk). Re-sequence: Change activity order. Overtime: Extended working hours. Negotiate: Extension of time or acceleration costs. Documentation: Keep detailed records of delays, Notify client promptly, and Submit claims per contract requirements. Prevention: Realistic initial schedule, Regular monitoring, Early problem identification.
What scheduling software is used in Kenya?
Scheduling software used in Kenya: Microsoft Project: Widely used, moderate cost, good for small to medium projects. Primavera P6: Industry standard for large projects, expensive, powerful features. Procore: Cloud-based, good for collaboration, subscription pricing. Smartsheet: Simple, spreadsheet-like, good for small projects. Excel: Basic scheduling, manual updating, free. Selection factors: Project size and complexity, Budget, Team familiarity, and Client requirements. Training: Essential for effective software use. Trust Partners uses industry-standard software for professional scheduling services.
How long should a construction schedule be?
Construction schedule duration depends on: Project size and complexity, Resource availability, Site conditions, and Regulatory requirements. Typical durations in Kenya: Small house (2-3 bedroom): 6-12 months. Medium house (4-5 bedroom): 12-18 months. Apartment block (4-8 units): 18-30 months. Commercial building: 24-48 months. High-rise building: 36-60+ months. Schedule should include: Realistic activity durations, Contingency for weather and delays, Time for regulatory approvals, and Commissioning and handover. Unrealistically short schedules lead to: Rushed work, Quality problems, Safety risks, and Cost overruns.
What is resource leveling in construction scheduling?
Resource leveling is adjusting the schedule to resolve resource conflicts and smooth resource usage. Purpose: Avoid over-allocation of resources (crew, equipment), Smooth resource usage over time, Reduce resource peaks and valleys. Methods: Delay activities within their float, Split activities into smaller segments, Add resources to critical activities, or Extend project duration if necessary. Trade-offs: Resource leveling may extend project duration, Increased duration may increase costs, But reduces resource idle time and overtime. Software: Microsoft Project and Primavera P6 have resource leveling features. Effective resource leveling improves efficiency and reduces costs.
