Inventory forecasting in glass distribution is a balancing act. Too much inventory ties up capital and storage space. Too little leads to missed deadlines, emergency sourcing, and damaged client trust. But when forecast errors persist, they signal systemic problems—not just spreadsheet mistakes.
The Miss: Over-Forecasting Specialty IGUs During a Downturn
A distributor forecasted high demand for a line of triple-glazed IGUs tailored for green building certifications. This prediction was based on past trends and a few large upcoming bids. However, only one of those projects moved forward, and the rest shifted timelines due to macroeconomic uncertainty.
Left with thousands of square feet of slow-moving inventory, the distributor had to discount and scrap much of it.
Where It Went Wrong
Forecasting model overweighted historical demand without factoring in bid volatility.
Sales team failed to flag the tentative nature of upcoming projects.
Procurement lacked visibility into bid status and converted all forecast demand into orders.
Organizational Costs
Excess warehouse holding costs for over five months.
Cash flow constraints on other high-demand SKUs.
Team friction between procurement and sales over accountability.
What Changed
Integrated CRM and inventory planning systems to tie forecasts to real bid stages.
Added probability-weighted forecasting tied to win likelihood.
Created an escalation review for bulk orders triggered by speculative forecasts.
Forecasts aren’t about numbers—they’re about context. Distributors who tie predictions to actual opportunity signals minimize risk and maximize inventory value.
