Quick answer
Batching means building one kitchen type per production run: nested cut sheets, the edgebander set once per decor, hardware kitted per kitchen into labelled crates, and unit 1 built and signed off before the run rates. Setup cost spreads across every repeat, which is why unit 30 costs less than unit 3 and mid-run changes break the price.
Key points
- A volume rate is the machine time and error risk that repetition removes. Setup happens once, then every repeat rides on it.
- One kitchen type per production run: same runs, same widths in millimetres, same decor, same hardware, cut as one nested program.
- Hardware is kitted per kitchen into a labelled crate, so the installer opens one box per address and nothing gets hunted, swapped or lost.
- Unit 1 is built complete and signed off before the run rates. A fault found at unit 1 costs one kitchen; found at unit 14 it costs fourteen.
- Mid-run spec changes, mixed decors and the 'just one different lot' are what break batching, and each of them is a cost somebody pays.
By 7.30 on a good workshop morning the edgebander has been running a single white decor for an hour, and it will not change coil before lunch. Beside it, a pallet of panels for kitchen type A, units 9 to 16 of a South Auckland package, every part cut last night from one nested program, every part labelled with its unit and position. Nobody is measuring anything, and nobody is deciding anything. The decisions were all spent weeks ago, and this is what they bought: a floor where the work just moves.
That morning is what a developer is actually buying with a volume rate. Not cheaper board, not thinner margins, but repetition engineered on purpose. The same machines, set once, fed the same parts for hours. It is also fragile. One mid-run variation, one lot in a different colour, and the floor goes back to deciding.
This piece explains how batching works from the cut sheet to the crate, why unit 30 genuinely costs less to make than unit 3, and which requests quietly dismantle the saving. If you are pricing a multi-lot package, it pairs with pricing a nine-lot kitchen package in Auckland, which walks the commercial side of the same logic.
Why does unit 30 cost less than unit 3?
Because most of the cost of a made-to-measure kitchen is setup and decision time: programming the cut, setting the edgebander for a decor, loading the boring patterns for hinges and runners, checking the first part against the drawing. On a one-off, every one of those setups serves a single kitchen. Across a batched run, the same setups serve the whole run, so their cost per kitchen falls with every repeat.
Error risk falls the same way. The tenth identical sink base is cut, edged and bored by a process that has already proven itself nine times that day. Volume discounts follow that curve honestly: a few per cent at five kitchens, more past twenty. The discount is the setup cost leaving the price, unit by unit, which is why it only exists while the units genuinely repeat.
One kitchen type per production run
A type is stricter than a layout. Two kitchens are the same type when the runs, the cabinet widths in millimetres, the decor, the benchtop and the hardware are identical, so one set of drawings and one cut program describes both. A 20-unit development might hold three real types once mirrored plans are recognised as the same kitchen flipped; sorting that out is its own job, covered in typing kitchens across mixed-lot plans.
Production then moves through the package one type at a time. All eight type A kitchens are cut, edged, bored and assembled as one run, then the floor changes over once and runs type B. Site order can differ from build order; the programme reconciles them, which is one reason the 20-unit delivery timeline is built backwards from the install sequence.
Nested cut sheets and one setup per decor
Nesting is the software packing every part of the run onto standard sheets so the saw cuts the whole type in one program. Eight identical kitchens nested together waste less board than eight kitchens nested separately, because repeating parts tile efficiently, and the offcut from unit 12's panel becomes unit 14's shelf inside the same program. Each part comes off the saw with a label: type, unit, cabinet position. The label is what keeps eighty identical-looking white panels from becoming a sorting exercise.
The edgebander is the other setup that batching protects. Changing decor means changing the coil, purging the glue line, running test edges: minutes each time, and minutes multiplied by every changeover a mixed schedule forces. One decor per run means the 2 mm edging goes on at line speed all morning. This is also why a package quoted in one colour and later split into two colours is a genuine requote: the second decor buys changeovers for the whole programme.
Hardware kitted per kitchen, in labelled crates
At the end of the line, hardware does not travel loose. Each kitchen's fittings are counted into one crate: the 35 mm clip-on hinges, the runners, the childproof catches for the defined cupboards, the cutlery insert, handles, fixings, the adjustable feet. The crate is labelled with the address and type, and it travels with that kitchen's flat-packed or assembled carcasses. On site, the installer opens one crate per address and everything for that kitchen is in it, in the counts the drawings say.
Kitting is rate protection dressed as tidiness. An installer who is short two hinges at unit 9 stops, drives, and loses an hour; a crate packed against a checklist in the workshop catches the shortage at a bench, before it ever reaches site. On social-housing work the same crate is where the catch and insert counts get checked against the coded lines, because those small per-No. items are exactly what a certifier queries when counts drift.
A batched production run, with the gate where it belongs.
Unit 1 is the gate
Before a run rates, unit 1 of the type is built complete: carcasses, doors, benchtop, hardware, the lot. It gets checked against the shop drawings and, ideally, walked by the builder or client rep, because a drawing approval and a physical kitchen are agreed to by different parts of the brain. Hinge boring, edge quality, catch positions, drawer action, the exact white of the decor in daylight: all of it is cheap to change at unit 1 and multiplies from unit 2 onward.
The gate is also a schedule device. Once unit 1 is signed, the spec is frozen in physical form, and every later 'could we just' has to argue with an approved object. Programmes that deliver identical kitchens across a Kāinga Ora development lean on exactly this: sameness is a comparison against a signed-off first article.
What breaks batching
Three requests do most of the damage, and none of them looks expensive when it is asked for.
- The mid-run spec change: a handle swap or a drawer upgrade landing at unit 9 of 20 stops the line, splits the programme into before and after, and creates two versions of one type on site. If a change is unavoidable, land it at a run boundary and reprice from there.
- Mixed decors: a second colour means edgebander changeovers, split board orders and doubled offcut stock for the life of the programme.
- The 'just one different lot': one kitchen with a moved sink or a longer run stops being type A. It leaves the run, gets its own drawings, its own program and its own price, and it should, or its cost hides inside the other nineteen.
The programme maths
A workshop week is a fixed number of machine hours; the only question is how many of them produce parts. When types repeat, our East Tāmaki floor moves ten-plus kitchens a week, because the saw runs long programs and the edgebander holds one decor for hours. Fill the same week with one-off kitchens in mixed colours and the count drops sharply, because the week fills with changeovers, checks and decisions. Same hours, different split.
| Aspect | Batched by type | Mixed one-offs |
|---|---|---|
| Cut programs | 3, one per type | 20 separate programs |
| Edgebander setups | 1 per decor per run | One per kitchen, per colour |
| First-article checks | 3 gated sign-offs | Every kitchen is its own first |
| Hardware handling | Kitted crates per address | Picked job by job |
| Where errors surface | Unit 1, in the workshop | Any unit, often on site |
This is why locked types are the price of the volume rate. The discount you negotiated at tender assumed the batched column of that table. Every exception you introduce moves lines into the mixed column while the rate stays batched, and the gap has to come from somewhere: the supplier's margin for a while, then the programme, then the relationship.
What to bring so your package can batch
Arrive with typed plans: group the lots, name the types, flag the mirrors. Lock decors and hardware before the cut sheets are written. Name the person who signs unit 1 and give them 48 hours to do it. Book the measure that releases production as one planned day, the way site measuring a whole development lays out, so the whole run starts from verified numbers.
Do that and the volume rate is real, the programme holds, and unit 30 quietly costs what unit 30 should. We build the same unit type forty times in a row when a package is set up this way, and the fortieth is the best one, which is the entire point of batching.
Frequently asked questions
Why do volume kitchen programmes cost less per unit?
Because setup cost spreads across repeats. Programming the cut, setting the edgebander for a decor, loading hinge boring patterns and proving the first article are fixed costs; on a one-off they serve one kitchen, on a batched run they serve the whole run. Error risk falls with repetition too. Discounts commonly step in around five kitchens and deepen past twenty, tracking that curve.
What does batching actually mean in kitchen production?
Building one kitchen type per production run. All kitchens of a type are cut from one nested program, edged with the decor set once, bored with the same patterns, assembled together, and their hardware is counted into a labelled crate per kitchen. The floor changes over once per type, so machine hours go into parts.
What is a first-article or unit 1 sign-off?
The first kitchen of a type is built complete and approved against the shop drawings before the rest of the run is produced. It catches boring errors, edge quality, hardware positions and how the decor actually reads in daylight while the cost of change is one kitchen. It also freezes the spec physically, so later change requests have to argue with an approved object.
Can I change the spec partway through a production run?
You can, but it becomes a new run. Parts already cut, edged and bored to the old spec become rework or waste, the programme splits into before and after versions, and the volume rate no longer describes the work. If a change is genuinely needed, land it at a run boundary, reprice from that point, and re-gate with a fresh first-article check.
Do mixed colours really cost that much more on a volume package?
More than they look like they should. A second decor means edgebander coil changes and glue purges at every switch, split board ordering, doubled offcut stock and two versions of every touch-up kit, sustained for the whole programme. If the design intent allows it, one decor across the package protects the rate; if two are required, expect the quote to say so honestly.
What should a developer prepare before asking for a volume kitchen price?
Typed plans with lots grouped and mirrors identified, decors and hardware locked, a named approver for the unit 1 sign-off, and a programme slot for a whole-development measure day. A supplier quoting against that can price the batched reality and hold the rate. A folder of twenty individual kitchen drawings in three colours gets priced as twenty one-offs, because that is what it is.
How many kitchens a week can a workshop produce?
It depends almost entirely on repetition. A floor that moves ten-plus kitchens a week on batched, repeating types can drop to a fraction of that on mixed one-offs, with the same people and machines, because the week fills with changeovers and first-of checks. When a supplier asks how locked your types are, they are really asking which week you are buying.