The short answer is that there is no single fixed extra cost per unit for a custom-size trash can. At our factory, custom sizing is quoted project by project because the per-unit premium depends on the dimensions, material, structure, tooling, order quantity, surface finish, accessories, packaging, and quality requirements. A simple adjustment to the height or diameter of an existing model may add only a modest amount per unit when the order volume is strong. A completely new shape, a new mold, thicker material, a special lid, pedal mechanism, divider, logo, or retail packaging can increase the cost much more.

Small trial orders usually carry a higher per-unit premium because engineering, setup, tooling, and quality control costs are spread over fewer pieces. Large repeat orders can reduce the extra cost significantly. In some cases, tooling is a one-time charge rather than a per-unit charge, and the per-unit premium may be lower than buyers expect if we can modify existing molds or use a modular design. For non-standard sizes, production efficiency, material waste, and packing method also affect the final price.

To receive an accurate per-unit quote, please share the exact dimensions, target capacity, preferred material, shape, lid type, liner or wheel requirements, surface treatment, printing needs, packaging requirements, destination market, certification needs, estimated annual quantity, and whether you need samples first. We will separate one-time tooling or engineering costs from the per-unit price so you can compare the total project cost clearly.

If you need a custom size from our trash can factory, the most reliable way to answer the cost question is to send your drawing or specification and order quantity for review. We can then confirm whether an existing model can be adapted or a new mold is required, and provide a transparent quotation with the extra cost per unit stated clearly.