Ordering parts that are already in stock is a procurement issue a shared stock record can help the team review.
In a small assembly workshop running multiple projects simultaneously, stock management is genuinely difficult. Parts come in for one project and get used on another. Components are partially used and returned to the shelf without being recorded. Emergency purchases are made without checking what's already available. Over time, the workshop fills up with excess stock that nobody knows about — while purchasing continues to order the same parts from suppliers.
This guide explains how to get control of your workshop stock and ensure that available inventory is always checked before a purchase order is raised.
Why Workshop Stock Gets Out of Control
Stock management problems in assembly workshops typically have a few common causes:
No Central Record
Stock levels exist in someone's head, on a whiteboard, or in a spreadsheet that nobody keeps up to date. Without a reliable, shared stock record, purchasing decisions may need to be verified by a physical check. A documented record gives the team a reference to review.
Stock Allocated to Projects But Not Tracked
When a part is drawn from stock for a project, it needs to be recorded — both to update the stock level and to reflect that the project's requirement has been met. If this doesn't happen, the stock record shows parts as available when they've already been committed to another job.
Surplus from Previous Projects
Every project generates some surplus — parts ordered to MOQ that weren't fully used, components that were superseded by a design change, or spare parts that were held "just in case." Without a process for returning surplus to the main stock and recording it, these parts become invisible.
Emergency Purchases Bypassing the System
When something is urgently needed, the temptation is to order first and record later. "Later" often never happens, creating phantom stock (recorded but not physically present) or unrecorded stock (physically present but not in the system).
The Right Approach to Workshop Stock Management
Maintain a Single, Shared Stock Record
Stock levels should be visible to everyone involved in procurement and project management — from the same current record. A cloud-based system can update that record as stock movements are entered.
Link Stock to Projects
When a project BOM is created, the stock check should be automatic: how much of each required component is currently in stock, and how much of that stock is already allocated to other projects? The answer tells you exactly how much to order — not how much you need, but how much you need to buy.
This "available stock" figure is the key number: Total stock minus stock allocated to other projects equals stock available for this project.
Record Every Stock Movement
Every time a part moves — received from a supplier, drawn for a project, returned from a project, scrapped — the movement should be recorded. This discipline is what keeps the stock record accurate over time.
Conduct Regular Stock Audits
Even the best-managed stock records drift from physical reality over time. A quarterly audit — physically counting key stock items and reconciling against the record — catches discrepancies before they cause problems.
The "Received" Button: Closing the Stock Loop
One stock-management discipline is systematically recording when ordered goods are received. When a delivery arrives, marking it as received should trigger two things: the purchase order is closed, and the stock level is updated.
This sounds obvious — but in a busy workshop, deliveries often arrive, get signed for, and go straight to the shelf without anyone updating the stock record. The result is that the system shows parts as outstanding when they're already sitting in the workshop.
Handling Excess Stock
Assembly projects can produce surplus stock. Capture it systematically rather than letting it disappear into the workshop. When a project completes, conduct a simple reconciliation: what was ordered versus what was used. Any surplus should be returned to stock and recorded.
This makes surplus visible and available for consideration on future projects.
Conclusion
Good stock management doesn't require a warehouse management system or an ERP. It requires a reliable, shared stock record that's linked to your project BOMs — so that available stock is automatically considered before any purchase order is raised.
AssembleFlow's Stock module does exactly this: it shows total stock, stock allocated to other projects, and available stock for each component across all your active projects. Start your free 14-day trial today.
Frequently Asked Questions
How do I avoid reordering parts I already have?
Keep a shared stock record and check available stock against the quantity required before raising any purchase order.
What is the difference between total stock and available stock?
Total stock is what is on the shelf. Available stock is what is left after parts reserved for other projects are taken out.
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