Customer-Supplied Materials: How to Quote and Invoice the Job

The customer found the faucet online for less and wants you to install it. Fine, perhaps. Then the box is missing a fitting, the finish arrives scratched, and your schedule absorbs a second visit while the customer says the install price should be lower because they bought the part. Customer-supplied materials can work when responsibility is divided before the appointment. Quote labor for the real install, inspect the product early, and state who owns compatibility, defects, missing parts, returns, and warranty.

Price Labor Without the Material Margin

Your labor price still covers scheduling, travel, setup, skill, tools, installation, testing, cleanup, and business overhead. It does not have to shrink to the minutes a wrench is turning. If your normal flat rate includes sourcing and a material warranty, create a separate owner-supplied labor rate that reflects the changed risk. Explain the difference plainly. The customer is providing one input, not replacing the service business around the installation.

Confirm Suitability Before the Work Date

Ask for model information, dimensions, specifications, photos, and required accessories. For costly jobs, inspect the item before reserving a full crew day. State that final compatibility may depend on site conditions. If the product is clearly unsuitable, stop and document the issue rather than modifying it beyond a safe scope. A second trip caused by a missing or wrong item should follow the trip-fee rule disclosed in the estimate.

Separate Workmanship From Product Warranty

Warranty your installation labor under your normal or stated terms, while making clear that product defects, manufacturer coverage, and return shipping remain with the customer unless you agree otherwise. If your labor must be repeated because the supplied product fails, say whether that return labor is billable. Keep the wording balanced. You still own damage caused by poor installation; the materials clause is not permission to avoid responsibility for your own work.

Write the Invoice Around What Happened

Name the customer-supplied product, service performed, testing, and any added work approved onsite. Do not list the product as your sale if you did not sell it. If you supplied small connectors or adaptation parts, show them separately. Record declined recommendations and compatibility limits in neutral notes. The invoice then proves both the completed installation and the boundary around a product whose purchase history lives somewhere else.