Guide
Flat-pack kitchens vs custom-built: which suits your NZ home
Flat-pack suits square rooms in standard sizes where price matters most; custom joinery earns its cost when the room is not standard, when you want cabinets sized to the millimetre, or when the finish has to match something. Both can be a sensible answer, and the room usually decides.
Updated
Key takeaways
- Flat-pack is standard-sized: it is cheapest when your room suits the module sizes.
- Custom cabinetry is made to your dimensions, so nothing is filled with a scribe panel.
- Bunnings' in-home design is free, 1.5–2 hours, drawn around their range.
- Mitre 10 offers a free consult with a render and organised installation, with one point of contact.
- Whichever you choose, the plumbing and electrical work still has to go to licensed trades.
What is the difference between flat-pack and custom cabinetry?
Not quality, mostly. Both flat-pack and custom kitchens are usually built from similar board with similar hardware. The real difference is whether the cabinets are made in standard modules or to your room's exact dimensions, and what that does to fit, storage and the process.
| Flat-pack | Custom joinery | |
|---|---|---|
| Sizing | Standard modules, gaps filled with panels | Made to your measurements |
| Lead time | Often available quickly | About 4–6 weeks of manufacture (Superior Renovations, 2026) |
| Design | Free, drawn around the range | Drawn for the room, usually paid for |
| Awkward rooms | Harder: villas are rarely square | Handles out-of-square walls and odd heights |
| Cost | Lowest | Higher, and the gap widens with complexity |
When is flat-pack the right call?
When the room is close to square, the runs suit standard module widths, and the budget is the brief. Rentals and pre-sale refreshes are the clearest case, as is any job where lead time matters more than a perfect fit and you are happy with the retailer's door range.
In those cases the free in-home design that comes with it is a real service, and we would rather say so than pretend otherwise. Mitre 10, Bunnings/Kaboodle, IKEA and Mastercraft compared sets out what each retailer publishes about warranty, design and prices.
- The room is close to square and the runs suit standard module widths.
- It is a rental or a pre-sale refresh, and the budget is the brief.
- You want it done soon, and lead time matters more than a perfect fit.
- You are happy with the retailer's door range and finishes.
When does custom joinery pay for itself?
When the room will not take standard modules. A villa or bungalow where nothing is square leaves 90 mm filler panels; ceiling-height cabinetry, an appliance standard modules will not take, awkward corners that have to be designed rather than selected, and a finish that must match existing joinery all point the same way.
- A villa or bungalow where nothing is square and standard modules leave 90 mm filler panels.
- Ceiling-height cabinetry, or a specific appliance that standard modules will not take.
- Awkward corners where the storage solution has to be designed rather than selected.
- A finish that has to match existing joinery elsewhere in the house.
What is the same whichever cabinetry you choose?
Whichever cabinets you buy, the sanitary plumbing must go to a PGDB-authorised plumber, the fixed wiring to a registered electrician who provides the certification, and any structural change to a Licensed Building Practitioner.
Retailer packages handle this by organising installers: Mitre 10, for instance, arranges installation with kitchen installers and gives you one point of contact and one invoice. Just make sure you know who the licensed trades are and that you get their paperwork. See who has to be licensed.
Questions
Is a flat-pack kitchen worth it?
In a square room on a tight budget, yes. In an old villa where nothing is plumb, the filler panels and compromises can cost you more storage than the saving is worth.
How much cheaper is flat-pack?
Enough to move a job between tiers: flat-pack replacements tend to sit in the $15,000–25,000 budget band while custom replacements sit in the $25,000–45,000 mid-range (CheckMyBuilder, July 2026). The gap widens as the room gets less standard.
Can you install a flat-pack kitchen I have already bought?
That is not what we do. We design and manage complete jobs with our partner joinery workshop. If flat-pack is the right answer for your room, we will say so at the consult and you will not have wasted the plan: it works for any supplier.
Do custom cabinets last longer?
Not automatically. Hardware quality and how well the kitchen was installed matter more than whether the boxes were made to order. Ask about the hinges and runners, and their warranty. What kitchen cabinets cost covers the finishes and how to compare quotes.
Sources
- Bunnings NZ: in-home kitchen design
- Mitre 10 designer kitchens
- CheckMyBuilder, kitchen renovation cost (updated July 2026)
- Superior Renovations, kitchen renovation cost Auckland (2026)
Checked 15 September 2026. We re-check every published figure quarterly.
Read next
All guidesMitre 10 vs Bunnings (Kaboodle) vs IKEA vs Mastercraft kitchens: what each actually offers
Who makes it, what the warranty says, what the free design really is, and the one retailer that publishes prices.
Read it →What a kitchen benchtop costs in New Zealand
Per square metre rates for laminate, engineered stone and granite, and what moves them.
Read it →Kitchen designer hourly rates in NZ: what designers charge
Free retailer design versus a paid independent plan, with the NZ fee benchmarks.
Read it →