Case Study: Real Results from Improving Seasonal route planning for construction supply

Company: SummitBuild Supply Co.

Industry: Construction Materials Distribution

Region: Pacific Northwest

Challenge: Frequent delivery delays, high fuel costs, and job site complaints due to seasonal disruptions in routing

The Problem: Seasonal Conditions Disrupting Delivery Operations

SummitBuild Supply Co. provides construction materials to hundreds of job sites across Washington, Oregon, and Northern California. While their year-round operations were strong, each seasonal shift brought a spike in delivery issues, including:

Snow-affected routes in winter

Flooded access roads in spring

High urban traffic and extended job hours in summer

Short daylight windows in fall

Over time, these seasonal variables created serious bottlenecks:

26% drop in on-time deliveries during winter months

Driver idle time increasing by 31%

Repeat job site complaints about missed windows and poorly timed drop-offs

$85,000+ in annual lost productivity and rerouting costs

The leadership team recognized that standard routing practices were no longer enough. They needed a more seasonally adaptive strategy to keep deliveries reliable and efficient year-round.

The Goal: Build a Smarter, More Seasonal-Aware Routing Model

SummitBuild set out to achieve the following:

Improve on-time delivery rates during winter and spring

Reduce reroutes and unplanned overtime due to poor seasonal planning

Provide contractors with more consistent and accurate ETAs

Optimize fuel usage across varying terrain and seasonal traffic patterns

The Solution: A Three-Part Seasonal Route Planning Overhaul

• Historical Data Analysis by Region and Season

Action Taken:

SummitBuild used route performance data from the previous three years to identify seasonal problem areas, delivery delays, and traffic trends.

Result:

Built a map of “high-risk” zones by season

Flagged routes with consistent winter or spring accessibility issues

Created rules for when to shift delivery times or staging locations

• Dynamic Routing with Weather and Access Constraints

Action Taken:

They implemented routing software with real-time traffic and weather overlays, enabling dynamic route adjustments based on seasonal disruptions.

Features Used:

Snow and flood risk alerts

Thaw-related weight restriction mapping

Alternate routing and stop reordering

Result:

42% drop in missed job site windows during winter and early spring

Reduced rerouting calls to dispatch by 61%

• Seasonal Contractor Coordination and Job Site Profiling

Action Taken:

SummitBuild began proactively communicating with contractors to identify seasonal access changes or site closures. They built profiles for recurring job sites, including:

Seasonal access hours

Equipment availability for unloading

Preferred delivery times based on sun/weather/workforce schedules

Result:

Fewer delivery refusals or redirections

Contractor satisfaction improved by 38% (based on post-delivery survey scores)

The Outcome: Real Gains in Efficiency and Reliability

After one full year of improved seasonal route planning, SummitBuild reported:

✅ On-time delivery improvement (winter/spring): +27%

✅ Reduction in seasonal fuel waste: –19%

✅ Fewer contractor complaints related to delivery timing: –43%

✅ Driver overtime reduced by: 22%

✅ Annual logistics cost savings: $112,000

Key Takeaways

Seasonal routing isn’t optional—it’s a strategic advantage.

Proactive communication with job sites saves time, money, and frustration.

Real-time routing tools must be supported by accurate site-level data and seasonal experience.

Visibility and flexibility are the foundation of seasonal delivery success.

Final Thoughts

Construction material delivery doesn’t stop when the weather changes—so neither should your logistics strategy. This case study proves that even modest improvements in seasonal route planning can yield major gains in delivery performance, cost savings, and contractor trust.

By anticipating seasonal challenges and designing routing plans that evolve with the environment, suppliers like SummitBuild are building more resilient, efficient, and competitive operations.