Separate orders from possibilities
Demand means the quantity customers need over a period of time. Start with approved orders and their required dates. Keep quotes, enquiries and hoped-for market sales in a separate forecast—a planning estimate, not guaranteed work.
For a repeat product, review units sold by week and note promotions, one-off bulk orders and periods when you ran out. Zero sales during a stockout may hide demand. For custom work, use the approved job's material list rather than assuming an average week will cover it.
Translate sales into materials
A sale of ten signs is not a purchase instruction for ten sheets. Convert the order into blanks, usable sheet layouts, hardware and packaging. Include a documented waste allowance appropriate to the job; improve it using completed-job records rather than an unexplained percentage.
Do not count approved orders twice by adding them to a forecast that already includes them. Write which portion of expected demand is confirmed and which is additional. Keep materials reserved for existing jobs separate from what you can promise to new customers.
Choose when to reorder
Lead time means the wait from placing an order until material is received and usable. A basic reorder point is expected use during that wait plus a reserve for uncertainty. That reserve is called safety stock. Match the time units in the calculation and review the assumptions as demand or delivery reliability changes.
Use this simple model for repeat-use items with reasonably steady consumption. Check usable stock plus dependable outstanding orders minus unmet commitments before buying again, with commitments counted only once. A total alone can mislead: a delivery arriving after a job's start date cannot cover that job.
Plan for a rush without filling every shelf
Write a normal-demand and a high-demand scenario, then check storage, purchasing cash and the shop's production capacity. A forecast of more sales does not create more finishing space or operator time.
Set a review date after the event or season. Reduce new orders when demand fades. For stock with no clear next use, record its age, quantity and a decision: use on a suitable job, return if permitted, sell, or dispose of appropriately. Avoid buying more merely to justify an earlier purchase.
Illustrative shop example
A starting trigger for repeat sign blanks
Illustrative assumptions: you use 8 blanks per week, delivery takes 2 weeks, and you choose a 6-blank reserve. The trigger is (8 × 2) + 6 = 22 blanks. This is when to review replenishment, not an order quantity or a guarantee against shortages. Check existing purchase orders and dated job needs first.
Try this in your shop
- Separate confirmed jobs from forecast sales.
- Record actual use and usable delivery times.
- Choose and explain a reserve for one important item.
- Check existing orders before placing another.
- Review the trigger after delays or a demand change.
Sources & next steps
Government and university references support the topics discussed. Suggested workflows, examples and checklists are WoodWorkCalc editorial guidance. References reviewed October 19, 2026; confirm current rules before making tax or employment decisions.