A hotel lighting package is approved, the order is placed, and then one line changes: a shade 40 mm wider, a different brass tone, a quantity cut because a corridor was re-planned. It arrives as an urgent email and lands on a factory that has already booked its slot and often already cut material.
This guide is for the project manager, procurement lead and design manager dealing with a change after the order rather than before it. It covers why timing drives the cost, the milestones that decide the answer, a routine for assessing and approving a change, and how to protect a delivery date when the change is genuinely necessary.
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| The same change costs differently at every stage: what is already cut, formed or finished is what has to be repeated. |
Why the same change costs more the later it arrives
A mid-production change is not expensive because suppliers are opportunistic. It is expensive because work already done has to be undone, repeated or written off, and every operation that follows narrows the options.
Three costs stack up once a change crosses a certain point. Material already committed: a sheet, profile, length of fabric or glass body cut to the approved dimension that cannot go back to stock. Capacity: the production slot has to be re-planned and the operations sequenced behind it may move. Re-approval: a changed drawing usually has to be signed off again before the item leaves the factory, and that signature sits outside the production schedule.
Which of the three applies is the whole point of assessing a change properly. A change raised before material is cut usually costs engineering time. The same change raised after a finish pass can cost the part.
The milestones that decide what a change really costs
Cost does not rise steadily; it steps up at specific points. The table maps the milestones that matter for decorative lighting and what a change raised after each one means.
| Milestone | What is already committed | What a change means from here |
|---|---|---|
| Drawing approved | Nothing physical; the production slot is booked | Revised drawing issued; slot usually kept |
| Sample approved | Jigs prepared; sample material used | A revised sample is normally required |
| Material cut or ordered | Profiles, fabric, glass cut to size | Off-cuts may be unusable; new purchasing can move the date |
| Metalwork formed | Forming set-up and labour already applied | Re-form or remake; finish may need rework |
| Finish applied | Plating, powder or lacquer pass and its curing time | The part is stripped and re-run, or remade |
| Assembled and wired | Components fitted, adhesive set, unit tested | Partial teardown; some parts are single-use |
| Packed and labelled | Carton, cradle and label data | Repack and relabel; possibly a new carton size |
The table is not a reason to avoid changes. It is a reason to ask one question early: where is this order now, and what operation comes next? If material is being cut tomorrow, a decision today is cheap. If the frames were finished last week, the same decision is a remake.
A change-control routine that takes a day, not a week
Most of the damage comes from elapsed time rather than from the change itself. The routine below exists to produce a decision while the line can still wait.
- Freeze the affected operations before the change is discussed. Letting the line run while the answer is being prepared is what turns a small change into a remake.
- Put the change in writing under one reference, stating what changes and what does not. Half-specified changes generate a second change.
- Ask for the delta, not a new price: material written off, operation repeated, effect on other items in the family, and the revised completion date.
- Require the same answer format every time, so two options can be compared on schedule effect rather than on impression.
- Decide rather than defer. Approve, postpone or drop it explicitly; a change left pending while production waits is the most expensive of the three.
What the approval should contain
As long as an approval says only "approved", the ambiguity stays in place. A workable one carries:
- The revised specification line or drawing, with its revision reference.
- A delta list: material written off, operation repeated, and the time effect rather than only the cost.
- A revised completion date for the changed item, stated separately from the rest of the order.
- Confirmation of which items are not affected, so work that is still correct is not stopped.
- Any effect on the spare-parts allowance, part references, packing list or carton marking.
- Confirmation that quality control will inspect against the revised document, not the superseded one.
Holding the delivery date when the change is necessary
Some changes cannot be refused, so the question becomes how to protect the date the rest of the project depends on. Four options are usually available.
- Split the release. Ship the unaffected items on the original date and the changed item afterwards, if the installation sequence can absorb it.
- Resequence on site. Move the changed item to a later floor, room type or phase while it is remade. That is a site decision, not a factory one.
- Accept a single-item delay rather than a package delay. One late fixture is usually cheaper than a held phase.
- Ask about an expedited path, with both a time effect and a cost effect stated in writing.
The expensive change is rarely the one that was approved. It is the one left pending while production continued, because by the time a decision arrives the cheapest version of it no longer exists.
Where change control breaks down
- The change is agreed on a call and never restated in writing.
- Production continues to the next operation while the change is being confirmed.
- The delta is priced but its effect on the completion date is not, so the schedule is adjusted twice.
- One item of a matched pair is changed and the other is not, so the pair no longer matches when installed.
- Spare-part references and packing lists are not updated alongside the change.
- The revised drawing never reaches quality control, so the item is inspected against the version it replaced.
Clauses worth settling before production starts
Change control is easier when the rules are agreed while nothing is urgent. None of the following needs a complicated contract.
- One named approver per side, with a deputy, so a decision does not wait on one diary.
- A definition of what counts as a change, so clarifications are not processed as rework.
- The rule that every change is answered with a time effect and a cost effect, in the same format.
- How revised documents are re-issued, and to whom, including quality control and packing.
- How spare-part references and handover documentation stay aligned with the as-built item.
FAQ
Should a change ever be made after the finish has been applied?
It is possible, but the part is usually stripped and re-finished or remade, and both time and cost rise sharply. If the change is cosmetic and the finish family is unchanged, ask whether it can apply from a defined unit onward so part of the order is unaffected.
Does a mid-production change always move the delivery date?
Not always. If material is not yet committed and the slot still holds, the original date can often be kept. If new material or a repeated finish pass is needed, the date follows the new lead time.
What if the change affects only one item of a set?
Treat it as a documented variant rather than a change to the family. Give it its own reference, confirm the finish is still comparable to the other items, and keep the spare-parts list clear about which version is which.
Who should approve a change during production?
One named person per side, with a defined limit. Approvals that wait for a meeting turn a one-day decision into a one-week hold, and that hold usually damages the programme more than the change itself.
How long should an assessment take?
Ask for the assessment window rather than assuming one. Document and label changes can often be assessed within a working day; changes touching a form, a finish pass or a custom fabric must be checked against capacity and material availability.
The takeaway
A change during production is a scheduling event before it is a commercial one. The cost steps up at a handful of known milestones, and the cheapest decision is always the one taken before the next operation starts. Freeze the affected work, ask for the delta rather than a new price, insist that every answer states its schedule effect, and decide instead of deferring. Then update the drawing, the packing list and the spare-part references together, so the change ends where it was approved rather than at the loading dock.
Zerouno Lighting (ZeroUNO) manufactures hospitality decorative lighting in Zhongshan, China, and has produced project and custom fixtures since 2013, with single-piece sampling before a production run begins. Change handling is agreed at order stage, where the revision path, the document trail and the spare-part record are settled together. Learn more at zerounolighting.com.
About the author
Sonny Yu is Sales Manager at Zerouno Lighting, working with hotel owners, designers and procurement teams on decorative lighting packages. He writes about the decisions that are cheap to make before an order is placed and expensive to unpick afterwards, including how a change raised mid-production is assessed, approved and documented.
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