A client changed his terminal specs halfway through our build last quarter. Mid-process requirement changes 1 like this can sink a project’s budget unless you re-confirm solution and pricing systematically.
To re-confirm solution and pricing after mid-process requirement changes, pause production, restate the new requirement in writing, verify the revised solution against original goals, price only the delta using the same station-based logic, quantify schedule impact, and secure signed written approval before work resumes.
That sounds simple. In practice, most disputes happen because one of those steps gets skipped. This article walks through each stage, using real examples from our automation equipment projects in Wenzhou.
Last spring, a procurement manager 2 in Mexico messaged me on WhatsApp: his end customer had switched lug sizes mid-build. His first question was simple — what happens now?
If you need to change requirements during production, notify your supplier immediately in writing, submit a formal change order request describing the new specification, pause affected work, and wait for a documented project impact analysis covering solution fit, price, and schedule before approving continuation.
The worst move is silence. When a buyer waits weeks to mention a spec change, our workshop keeps building the old design. That wasted work always ends up in someone’s budget. The best move is fast, written notice — even a short email with the new drawing attached.
Not all changes are equal. In our terminal machine projects, we sort every change order request 3 into one of four buckets before anyone touches a price sheet.
| Change Type | Example | Typical Handling |
|---|---|---|
| Product spec change | New lug dimensions or material | Re-check tooling and feeders first |
| Add a process station | Extra crimping or inspection step | Revised solution plus added price |
| Remove a process station | Drop a marking step | Keep the station blank for future use |
| Cosmetic or control change | HMI language, cabinet color | Often absorbed if minor |
We always refer back to the original Statement of Work. It tells both sides what was in scope and what was not. This is the heart of scope creep management: the SOW is the baseline, and the change is measured against it, not against memory or old chat threads.
Before pricing anything, we run a quick re-discovery session. We restate the new requirement in the customer’s own language and confirm it still matches his production goals. Many pricing disputes happen because teams re-price the wrong thing — they quote the changed request before checking whether the revised requirement still fits the original solution direction. A change threshold policy also helps here: tiny tweaks get absorbed into a pre-agreed buffer, but once a change crosses a defined complexity line, a mandatory pricing re-evaluation triggers automatically.
We weigh a trade-off on every automation project: quote every possible station upfront, or keep the machine lean and fairly priced. Station-based pricing lets us stay honest either way.
Your new price is calculated per process station. Suppliers total the added stations’ tooling, feeders, labor, and controls at original project rates, apply a 10–20% uncertainty buffer for unknowns, and issue a revised price quotation covering only the delta, not the whole machine.
Here is how it works on our own equipment. An automatic assembly machine is priced according to its process stations. Each station — feeding, orienting, crimping, inspecting, unloading — carries its own tooling, actuators, sensors, and programming hours. So when your technical specifications change, we do not re-quote the whole machine. We price the change at station level.
If your new requirement needs an extra step, we revise the solution and add the corresponding station price. The rates for engineering, machining, and assembly stay the same as the original quote. That keeps margin discipline consistent and makes the revised price quotation easy to audit line by line.
This surprises many buyers. If you delete a process, we usually keep the original station in place as a blank program station. The mechanical position and control slot stay reserved, with an empty program slot in the PLC. The benefit is real: if your product line evolves next year, you can add that process back without rebuilding the frame. This protects your value proposition alignment over the machine’s whole life, not just this order.
| Pricing Model | Best For | Watch Out For |
|---|---|---|
| Fixed add-on price | Clearly defined station additions | Needs a frozen spec first |
| Time and materials | Exploratory or uncertain changes | Requires trust and reporting |
| Cost-plus with margin | Custom tooling and molds | Buyer may ask for cost proof |
| Value-based anchoring | Changes that raise output or ROI | Harder to benchmark |
| Tiered or modular brackets | Repeat change types | Less precise per case |
For changes with real unknowns, we add an uncertainty buffer 4 of roughly 10–20%, and we say so openly. Transparent breakdowns — effort, rates, direct costs, buffer — get approved faster than lump sums. Modular pricing brackets also give you a sense of control: pick the tier that fits your budget contingency planning, and we build to that.
Our workshop once re-tooled a crimping station mid-build for a customer in Vietnam. The rework itself was quick; waiting for his written sign-off took far longer.
Yes, mid-process changes usually extend delivery, but the delay depends on change type. Adding stations adds tooling, programming, and testing time; removing stations by leaving them blank adds almost none. A prompt change order request and fast written approval minimize the schedule impact.
Buyers often assume the delay equals the extra build time. It does not. The real schedule impact has three layers, and only one of them is visible on the shop floor.
First, there is direct work: machining new tooling, mounting a feeder bowl, writing and testing the new program. Second, there is switching cost. When our technicians stop mid-assembly, re-plan, and re-start, they lose momentum — this is why formal change processes often apply a complexity premium for mid-stream pivots. Third, there is decision lag. Every day a revised quote sits unsigned, the machine sits idle in the queue. Formal contract-change protocols often require review and agreement within a defined number of business days precisely to kill this third layer.
| Change Scenario | Typical Timeline Effect | Main Driver |
|---|---|---|
| Blank a removed station | Minimal to none | No new tooling needed |
| Modify existing tooling | Days to a couple of weeks | Machining and re-testing |
| Add one new station | Weeks, spec dependent | Tooling, feeder, programming, QA |
| Change base product spec | Longest impact | May affect several stations at once |
Requirement volatility is normal in custom automation — end customers change parts, markets shift, drawings get revised. What protects your delivery date is speed of confirmation, not absence of change. Send the new drawing early. Answer clarifying questions the same day. Approve the revised proposal within the agreed review window. In our experience exporting to markets like the US, India, and South Korea, the buyers who reply fastest almost always ship closest to their original date. We also update milestones in writing after every approved change, so nobody plans logistics around a schedule that no longer exists.
Early in our export business, we resumed a build on a WhatsApp okay alone. The invoice dispute that followed taught us to never skip written confirmation again.
Before your order continues, you need a signed change order form, a revised price quotation, an updated technical drawing or specification sheet, a Statement of Work revision showing new milestones, and a contract amendment or purchase order addendum signed by named approvers on both sides.
The paperwork is not bureaucracy. It is how both sides prove, months later, exactly what was agreed. Here is the document set we use on every changed order, and what each one does.
| Document | Purpose | Who Signs |
|---|---|---|
| Change order form | Defines what changed and why | Named approver on each side |
| Revised price quotation | Fixes the delta price and payment terms | Buyer’s commercial lead |
| Updated drawings/specs | Freezes the new technical baseline | Buyer’s technical lead |
| Statement of Work revision | Resets scope boundaries and milestones | Both project managers |
| Contract amendment or PO addendum | Makes the change legally binding | Authorized signatories |
A signature from “the team” means nothing in a dispute. We ask for a named approver on both sides — usually the buyer’s procurement or project manager and our sales engineer. A digital signature is fine. This creates real stakeholder buy-in: the person who approved the change also owns communicating it internally, so the production manager, the finance team, and the end customer all hear the same story.
Once signed, the approved change must be logged against the project and the billing system. If it lives only in an email thread, the added value disappears — the extra station gets built, but the invoice never reflects it, or the buyer’s records never show why the price rose. We attach the change order number to the revised invoice, the updated timeline, and the final acceptance test document. When the machine ships, every document points to the same version of reality.
Requirement changes are normal; ambiguity is expensive. Re-confirm the new solution, price the delta by station, document approval, and your project keeps its budget, schedule, and trust intact.
