Quoting Assembly and Kitting Jobs

Most digital manufacturing shops start with making parts — CNC machining, 3D printing, sheet metal, or a mix. But customers increasingly want finished assemblies, kitted sub-assemblies, or complete box builds. Quoting those jobs the same way you quote a single part leaves money on the table and creates scheduling headaches.

The difference isn’t just “more labor.” Assembly introduces fasteners, adhesives, inspection steps, packaging requirements, and coordination across multiple processes. Each adds cost and risk. Here’s how to build quotes that capture the full scope.

Break the Bill of Materials into Quoteable Lines

Start by separating the BOM into three categories: fabricated parts, purchased components, and assembly consumables. Fabricated parts get quoted with your standard process rates — machine time, material, setup, and post-processing. Purchased components (motors, bearings, electronics, fasteners) need a markup policy: cost plus a handling percentage, or a flat fee per line item. Assembly consumables — threadlocker, lubricant, zip ties, heat-shrink tubing, labels — are often missed. Create a standard kit list per assembly type and apply a small consumable kit charge.

Define Assembly Labor as Discrete Operations

Don’t lump assembly into a single “assembly hours” line. Break it into operations: mechanical fastening, adhesive bonding, electrical termination, cable routing, torque verification, functional testing, and final inspection. Each operation has a different skill level and time requirement. Use historical data or time studies to set standard minutes per operation. If you’re new to assembly, start with a conservative estimate and track actuals to refine.

Account for Fixturing and Tooling

Assembly often needs custom fixtures: holding nests, alignment jigs, torque reaction arms, test stands. These are real costs. Quote them as separate line items — design time, fabrication time, and material. If the fixture is reusable across a production run, amortize it over the expected volume. If it’s a one-off prototype assembly, the full cost goes into that quote.

Build in Inspection and Quality Gates

Assembly quality isn’t just dimensional. It includes torque records, continuity tests, pressure checks, firmware flashes, and cosmetic standards. Define the inspection plan upfront: which operations get 100% checks, which get sampling, what documentation the customer requires (FAIR, PPAP, certificates of conformance). Each gate adds labor time and may require calibrated equipment. Quote it explicitly.

Handle Packaging and Kitting Logic

Kitting means gathering components — fabricated, purchased, consumables — into a defined package: labeled bags, partitioned trays, foam inserts, anti-static shielding, custom boxes. Packaging design time, materials, and labor are quoteable. If the customer supplies packaging specs, review them for feasibility. If they don’t, propose a standard method and quote it. Don’t forget shipping prep: palletizing, strapping, freight class determination.

Manage Customer-Furnished Components

Customers often supply motors, PCBs, or specialty fasteners. Your quote must address receiving inspection, inventory tracking, shortage handling, and return logistics for unused parts. Charge a receiving and kitting fee per customer-furnished line item. Specify lead-time requirements for their parts to arrive before your assembly start date — delays on their end shouldn’t eat your margin.

Use a Configurable Quote Engine

Assembly quotes have too many variables for spreadsheets: variable BOMs, optional operations, volume breaks, fixture amortization, customer-furnished logic. A configurable quote engine like Solvi lets you build assembly templates with all these rules baked in — so estimators select the assembly type, enter quantities, and get a complete, accurate quote in minutes instead of hours.

Assembly and kitting work grows revenue per order and deepens customer relationships. Quoting it well means capturing every cost driver without padding. Start with the structure above, refine with real data, and automate the repeatable parts.