Reserving Factory Capacity: How to Write an Agreement That Holds in Peak Season

The Problem: The Order That Was Too Late to Make

Every season produces the same story. A buyer confirms a programme in good time, sends the order, and is told the lead time has extended — not because anything is wrong with the order, but because the capacity that existed when the enquiry was made has been promised to someone else. The buyer's alternatives are then all expensive: pay a premium for a rush, accept a later date, or air-freight part of the volume. A capacity reservation exists to remove that choice, and it only works if it is written down.

Products in this guide: Bone China Rice Bowl Set · Ceramic Baking Bowl

A reservation is a calendar instrument above all: it fixes the date by which an order has to be released. The replenishment calendar maps the ordering windows for the whole year. It also locks a specification version rather than merely a quantity. The spec freeze guide explains how artwork and packing files are locked between orders. The full chain follows the standard sourcing map. See the full ceramic sourcing process map.

How Capacity Is Actually Measured

You cannot reserve something that has not been quantified, and this is where most reservations fail — they are expressed in pieces, when the constraint is elsewhere. Four units of measure are used in practice, and a workable agreement names the one that is actually the bottleneck.

Kiln volume or firings. The kiln is usually the true constraint: a factory can form more pieces than it can fire in a given week. Capacity here is expressed in firings per week, or in kiln volume, and it converts into pieces through the yield of the specific item.

Line hours. For forming and glazing, capacity is machine or line hours per week. Useful where a body requires a specific mould or line.

Decoration capacity. Where a print or a decal is the constraint — a heat-transfer line, a decal application team, a printing press — that step sets the ceiling, not the body.

Labour for finishing. Hand finishing, gilding and packing are labour-limited, and in a peak they are the first constraint to bite.

The practical implication: a reservation should state which step is being reserved, because a reservation of "moulding capacity" is worthless if the kiln is full.

The Three Structures

1. Soft reservation — priority without commitment. The factory acknowledges a planned volume and gives the buyer priority in booking sequence. Costs nothing, guarantees nothing, and is what most suppliers mean when they say the capacity is "there". Useful as a first step with a new supplier; insufficient for a programme with a fixed shelf date.

2. Hard reservation with a fee or deposit. The buyer pays a reservation fee or a deposit against the coming order; the factory holds the capacity and may refuse other work against it. This is the structure that actually holds in a peak, because it puts money on both sides of the promise. Two questions decide how it is written: is the fee credited against the first invoice (usually the case, and the fair arrangement) and is it refundable if the buyer cancels — normally not, or only in part.

3. Take-or-pay. The buyer commits to a volume over a period and pays for it whether taken or not. Appropriate for genuine annual commitments where the factory is being asked to forgo other business for the whole season. It is the strongest instrument available, and it should come with the strongest protections on the buyer's side — see below.

The Clauses That Make It Hold

Volume, with a tolerance band. A reservation should be a band, not a number: for example a committed minimum with a range for the balance, expressed as a percentage either side. This is what allows a buyer to be honest about a forecast without exposing themselves, and gives a factory something it can plan against.

The window. Dates, not seasons. "August to October" is a season; "kiln capacity of X firings per week, from the first week of August to the second week of October, with delivery within three weeks of order release" is a reservation.

Price basis, and how it moves. Reserve the price for the committed minimum, and state the mechanism for the balance — an agreed index, or a formula tied to defined input costs, with a review date. A price that is left open is a reservation in name only.

Priority in a shortage. The clause a buyer should insist on: if the factory is unable to serve all customers, capacity reserved under this agreement is allocated before discretionary orders. Without it, a reservation simply places the buyer in a queue that can be reordered.

Visibility obligations. A commitment from the supplier to report the load on the reserved step — firings completed against plan, units in progress, the level of other work booked. Fortnightly is usually enough. This is what turns a reservation into a plan rather than a hope.

Release and rollover. The date by which a specific order must be released to hold the slot, and what happens to unused capacity — whether it lapses, rolls into the following period, or converts into a credit. Most disputes in this area come from a rollover that was assumed rather than agreed.

Shortfall and cancellation. What the buyer pays if the minimum is not taken, and what the supplier owes if the reserved capacity is not delivered. Both should be stated, and they should be symmetrical in spirit even if not identical in number.

Quality and specification continuity. The reservation applies to a defined specification version. Without this clause, a factory under pressure may deliver against an older specification and argue that the reservation was about volume.

How to Decide Which Structure to Use

Three questions answer it. How fixed is the date? If a shelf date or a festival is involved, a soft reservation is not enough. How much of the factory's capacity does this represent? A buyer taking a small share of output cannot expect the factory to forgo other work without an incentive. How much history is there? A first-year programme with a new supplier should start with a paid reservation on a modest volume and prove itself before committing a season.

The Five Failures to Avoid

1. A reservation expressed in pieces when the bottleneck is the kiln. Quantify the constraint that actually binds.
2. A forecast treated as an order. The forecast informs planning; the released order triggers capacity. Say which is which.
3. No release date. A slot held indefinitely is a slot that blocks the factory and irritates it.
4. No allocation clause. In a shortage, an agreement without priority is a letter of intent.
5. Nothing in writing. The most common cause of the entire problem, and the easiest to fix: a one-page document, signed by both sides, covering the clauses above.

What This Looks Like in Practice

A buyer with a fourth-quarter programme, working with a factory whose kiln is the constraint, agrees in May or June: a committed minimum with a tolerance band; a reserved number of firings per week for the August–October window; a price fixed for the minimum with a review mechanism for the balance; a deposit credited against the first invoice; a release date 30 days before each delivery; a fortnightly load report; and an allocation clause giving the buyer priority when the kiln is full.

That document does not eliminate risk. It converts an unmanaged risk into a managed one, and it is the difference between a supplier who says the capacity will be available and a supplier who can prove it.

The Habit That Ties It Together

The habit is to book the constraint, not the product. Programs that do this enter peak season with a date they can plan around — and stop paying a premium for capacity they thought they already had.