Engineer-to-order (ETO)
Engineer-to-order (ETO) is a manufacturing strategy where products are designed or engineered specifically for each customer order. Unlike configure-to-order (selecting from predefined options), ETO requires custom engineering work, drawings, BOM creation or non-standard manufacturing. Each order is a project.
What engineer-to-order means in practice
Engineer-to-order is the manufacturing mode for products that cannot be assembled from a catalog of predefined parts. The customer's specification requires design work, custom tooling, unique materials, or engineering that has not been done before. Each order is quoted as a project, often with price on request, and production begins only after the design and engineering are approved.
ETO is common in industrial equipment, architectural metalwork, custom machinery, specialty electronics and one-off fabrication. The buyer provides a specification, a set of requirements or performance criteria, and the manufacturer engineers the solution. The output is a unique product with its own drawings, BOM and production process.
The challenge is that every ETO order requires engineering time before a price can be quoted. A cabinet shop can price a standard cabinet with a custom finish (configure-to-order) in minutes from its pricing matrix. The same shop quoting a fully custom vanity enters ETO mode when the vanity requires structural changes, new hardware mounting, and a sink cutout the shop has never made. The price depends on engineering work that has not been done yet.
ETO vs configure-to-order, make-to-order and build-to-order
Configure-to-order (CTO)
Products are assembled from predefined options and components. The buyer selects finish, size, fabric grade or hardware from a set of choices the maker has already engineered and priced. Configuration takes minutes; pricing is from rules. CTO is fast and repeatable.
Engineer-to-order (ETO)
Products are designed or engineered for each order. The buyer's specification requires custom engineering work, drawings, BOM creation or manufacturing steps the maker has not done before. ETO orders are quoted as projects, often with price on request. Each order is a one-off.
Make-to-order (MTO) or Build-to-order (BTO)
Products are manufactured after an order is received, but the level of customization varies. MTO and BTO can mean configure-to-order (selecting from options) or engineer-to-order (custom engineering). The terms are broad. CTO and ETO are more precise: CTO means predefined options; ETO means engineering work per order.
Why ETO orders are priced differently
An engineer-to-order product cannot be priced from a matrix because the design does not exist yet. The cost depends on engineering hours, material sourcing, tooling, and manufacturing steps that are unique to this order. The maker must scope the work, design the solution, and estimate the cost before committing to a price. That is why ETO orders often begin with price on request.
Custom engineering required
Each ETO order requires design work, CAD drawings, BOM creation or structural calculations. The engineering cost is part of the project cost, and it varies by the complexity of the customer's specification. Until the engineering is scoped, the price is unknown.
Non-standard materials or processes
ETO often involves materials the maker does not stock, finishes that require new tooling, or manufacturing processes the shop has not done before. The cost depends on sourcing, lead times and learning curve. A configure-to-order product uses the maker's standard materials and processes; an ETO product may require both to be sourced or invented.
One-off production
An ETO product is manufactured once, for this order, with no expectation of repeat business on the exact same design. Tooling, jigs and setup costs are amortized over one unit or one small batch. That makes ETO products more expensive per unit than configured or made-to-stock products.
Price on request is honest
Because the cost depends on engineering work that has not been done yet, many ETO manufacturers quote price on request for the initial inquiry, then provide a detailed quote after the scope is defined. That is more honest than guessing a price before the design is complete.
How Poly9 AI handles ETO products
Poly9 AI prices configured products from your cost recipes and pricing rules. Some requests need engineering: a size outside your range, a material you have not priced, a cutout you have never made. For those parts the AI returns price on request instead of guessing.
For hybrid products (part configurable, part engineered), the AI prices the configurable components from your cost recipes and returns price on request for the rest. A cabinet with a standard carcass but a custom sink cutout gets a price for the carcass and POR for the engineering work. Your team sees the full inquiry in Projects and decides how to quote the engineered portion.
Poly9 does not generate CAD drawings, BOMs or engineering designs for ETO work. It prices what your rules cover and routes the rest to your team. That keeps your quotes honest: every number on the quote is one you certified, and every price on request is a signal that engineering work is required.
Terms ETO connects to
Configure-to-order
The manufacturing strategy for products assembled from predefined options. CTO is faster and more repeatable than ETO because the engineering is done once and reused.
BOM (Bill of Materials)
The list of components, materials and quantities needed to manufacture a product. ETO orders generate a unique BOM for each order; CTO products share BOMs across configurations.
Cost recipe
The pricing rules that compose a custom product quote. Cost recipes work for CTO products with predefined options; ETO products require per-project estimation.
Price on request
What Poly9 AI returns when a pricing rule is missing or a configuration requires engineering work. POR is honest: it signals that the price depends on work that has not been scoped yet.
RFQ (Request for Quote)
The buyer's request for a price on a product or project. ETO orders often begin as RFQs because the price depends on engineering work that must be scoped before quoting.
MOQ (Minimum Order Quantity)
The smallest quantity a maker will accept for one order. An ETO order is usually quoted as one project, so the setup cost sits in the project price rather than behind a quantity floor.
CPQ for custom products
Configure-price-quote software for products with options. CPQ works well for CTO products; ETO products require project quoting tools or manual estimation.
Questions about engineer-to-order
What is the difference between configure-to-order and engineer-to-order?
Is make-to-order the same as engineer-to-order?
Can Poly9 AI quote engineer-to-order products?
Why is ETO more expensive than CTO?
How do you price an engineer-to-order product?
Price configured products from your rules
Poly9 AI prices every configured variant from your cost recipes, applies your pricing rules, and returns price on request when a rule is missing. Add your catalog or start from your industry sample, on a plan paid monthly.