Before comparing prices, understand your product’s cost

Two suppliers can quote the same part using different assumptions. Material, finish, inspection, order quantity, packaging and tooling can all change the price. A lower quotation is worth investigating, but it isn’t yet a confirmed saving.

Start with a cost baseline: a clear record of what the product currently costs and what each figure includes.

Separate ongoing costs from one-time costs

List materials, purchased components, processing, assembly, testing and known scrap or rework costs. Record quantities, currency and delivery terms so comparisons use the same assumptions.

Keep the cost of engineering changes, tooling, samples and testing separate. A lower unit cost may require an investment that only makes sense at a particular volume.

Mark missing figures as unknown. Treating them as zero makes a comparison look more complete than it is.

Find out what drives the cost

A tolerance tighter than the function requires may add machining or inspection time. Reducing part count may simplify assembly, but combining parts can make tooling or replacement more expensive.

Before changing materials or finishes, check what the existing choice does for the product. Appearance, wear, operating conditions and assembly can all affect whether an alternative is suitable.

Review supplier options alongside the design. Sending the same unclear drawing to a cheaper supplier may move the problem without solving it.

Compare the cost of making the change

For each opportunity, record:

• The proposed saving and its assumptions.
• The design, tooling or supplier change required.
• Performance and quality requirements that must be retained.
• Samples, tests, lead times and one-time costs.
• Effects on inventory, order quantities and future changes.

This helps distinguish an attractive estimate from a practical improvement. Smaller changes with good supporting information can be worth implementing before larger, less certain options.

Verify the result in production

Choose samples or trials that test the risks introduced by the change. Update approved drawings, BOM and instructions before using the new version in routine production.

Then compare actual costs with the original baseline using the same assumptions. A quoted saving only becomes a measured saving when production records support it.

Explore Product Cost Reduction or the supporting Product Development & Engineering work.