TL;DR: A sink cabinet is the wettest cabinet in a Malaysian kitchen and needs to be specified differently from the rest. Size it at least 100mm wider than the sink bowl, choose a material that tolerates permanent damp, ventilate the cavity, and leave real access to the trap. Most sink cabinets fail from moisture, not from use.
1Introduction: the cabinet that has a harder job than the rest
Quick Answer: Every other cabinet in your kitchen stores dry goods. The sink cabinet houses live plumbing, absorbs splash from above, and traps humid air below. Specifying it the same way as the rest of the kitchen is why it is usually the first one to swell, rust or smell.
Walk into any Malaysian kitchen that is eight years old and look under the sink. In a lot of them the cabinet floor has softened, the hinges have spotted with rust, or there is a faint musty smell that no amount of cleaning shifts.
That is rarely bad luck. It is what happens when the sink cabinet is treated as one more unit in a run of identical carcasses same material, same construction, same ventilation, which is to say none.
This guide treats it as the specialised piece of equipment it is. We will size it properly against the sink, choose a material that suits permanent humidity, deal with ventilation honestly, and plan the plumbing access you will be very glad of the first time something drips.
The video below shows why the plumbing cut-outs deserve attention before the cabinet goes in.
Watch: cutting a sink base cabinet for plumbing
How the pipe openings in a sink base cabinet are set out, and why oversized rough holes cause problems later.
Source: Installing your sink base cabinet (cutting holes for plumbing)
2Sizing the cabinet to the sink, not the other way round
Quick Answer: Choose the sink first, then size the cabinet. As a working rule the cabinet should be at least 100mm wider than the sink's overall length so the countertop cut-out lands on solid carcass, not on the cabinet sides.
The cut-out is the reason this order matters. A sink drops into a hole in the worktop, and that hole must sit clear of the cabinet side panels. Order a cabinet the same width as the sink and the fabricator has nowhere safe to cut.
| Sink overall length | Bowl configuration | Min. cabinet width | Typical setting |
|---|---|---|---|
| 400–500mm | Compact single bowl | 600mm | Studio, wet kitchen, bar sink |
| 500–600mm | Standard single bowl | 700mm | Condo kitchen |
| 700–800mm | Large single or compact double | 900mm | Family kitchen |
| 800–900mm | Double bowl or workstation | 1,000mm | Landed house, heavy cooking |
| 900mm+ | Full workstation with accessories | 1,100mm+ | Purpose-designed kitchen island or run |
Planning model. Sink length bands reflect the single bowl, double bowl and workstation sizes listed in the Big Bath kitchen sink catalogue (roughly 410mm to 880mm), cabinet widths add clearance for the countertop cut-out.
Depth matters too, and it is easier to get right. A standard base cabinet is around 500–550mm deep, which suits most sinks. What catches people out is a deep-bowl sink in a shallow cabinet — the bowl protrudes into the door space and the shelf you were counting on cannot be fitted.
Choose the sink first from the kitchen sink range, note its overall dimensions and bowl depth, then specify the cabinet around it.
Key takeaway: Sink first, cabinet second, and add at least 100mm of width. Bowl depth decides whether you get a usable shelf underneath.
3Single or double bowl, and what it does to the cabinet
Quick Answer: A double bowl needs a wider cabinet and two waste connections joining into one trap, which uses much of the useful space underneath. A large single bowl gives more washing room above and more storage below which is why single bowls have been gaining ground in Malaysian kitchens.
The traditional argument for a double bowl was washing in one side and rinsing in the other. In practice, most Malaysian households now run a dishwasher or wash large woks and steamer trays that simply do not fit in half a sink.
- Large single bowl. Takes oversized cookware, leaves a clear cabinet underneath, needs one waste. Best for most modern kitchens.
- Double bowl. Useful if you genuinely separate tasks, or run a wet-and-dry kitchen split where the sink handles heavy prep.
- Workstation sink. A single bowl with a ledge for chopping boards, racks and colanders. Gains worktop function without extra cabinet width.
Big Bath's comparison of single bowl versus double bowl sinks goes deeper on the cooking side of the decision. From a cabinet perspective, the summary is simple: every extra bowl costs you storage.
Key takeaway: Bowls above cost storage below. Unless you actively use two bowls, a large single or a workstation sink gives you more of both.
4Cabinet materials that survive a Malaysian kitchen
Quick Answer: Aluminium and stainless steel handle permanent damp best and are immune to termites, which is why they dominate Malaysian sink cabinets. Timber-based boards look warmer and cost less, but under a sink they are the material most likely to fail first.
Material choice matters far more under the sink than anywhere else in the kitchen, because this is the one cabinet that never fully dries out.
| Material | Moisture tolerance | Termite risk | Notes |
|---|---|---|---|
| Aluminium | Excellent | None | Light, will not rust; the Malaysian default |
| SUS304 stainless | Excellent | None | Most durable; heavier and dearer |
| Carbon steel (coated) | Good while coating is intact | None | Watch for chips at cut edges |
| PVC | Excellent | None | Waterproof but less rigid over long spans |
| Solid wood | Moderate, needs sealing | Real | Beautiful; demands maintenance under a sink |
| MDF / particleboard | Poor once edges are breached | Real | Swells irreversibly; avoid in the sink bay |
Compiled reference. Material list reflects the cabinet constructions offered in the Big Bath cabinet range aluminium, SUS304, carbon steel, PVC, solid wood and nano-alloy finishes.
A sensible compromise many Malaysian households use: timber-look doors on a metal carcass. You get the warmth on the face, and the part that actually gets wet cannot swell.
Key takeaway: Whatever you use elsewhere in the kitchen, make the sink bay carcass metal or PVC. Board products under a sink are borrowed time.
Comparing cabinet materials?
Open the doors, check the hinges and feel the carcass thickness for yourself — browse the cabinet range →
5Ventilation: where the damp actually comes from
Quick Answer: Most under-sink damp is not a leak. It is condensation on cold pipes, residual splash around the sink clips, and humid air that has nowhere to go once the doors close. Ventilating the cavity fixes more problems than sealing it ever will.
This is the section most kitchen guides skip, and it explains why sink cabinets deteriorate even when the plumbing is sound.
| Source | How common | Remedy |
|---|---|---|
| Humid air trapped in the cavity |
|
Ventilation slots or a gap at the plinth |
| Condensation on cold supply pipes |
|
Pipe lagging on the cold feed |
| Splash past the sink seal |
|
Correct silicone bead; check clips are tight |
| Weeping trap or waste joint |
|
Accessible trap so it can be tightened early |
| Wet cleaning items stored inside |
|
A wire basket rather than a solid shelf |
Compiled reference for tropical kitchens. Relative frequency reflects common causes of under-sink cabinet deterioration observed in Malaysian installations; treat the bars as a ranking, not measured values.
Three cheap measures cover almost all of it: a ventilation gap so air can move, lagging on the cold pipe so it stops sweating, and wire rather than solid shelving so nothing sits in a damp pocket. None of them adds meaningfully to the cost of the kitchen.
Key takeaway: Ventilate rather than seal. A sink cabinet that can breathe outlasts a sealed one, whatever it is made of.
6Plumbing access: designing for the day it drips
Quick Answer: You need to reach the trap, the stopcock and every waste joint by hand, without removing a shelf or emptying the cupboard. If a leak is hard to reach, it stays a leak for weeks — and weeks is what destroys a cabinet.
Everything under a sink competes for the same cavity. Before the cabinet is built, list what has to fit and check it against the space available.
| Component | Always needed? | Access required |
|---|---|---|
| Trap (P-trap or bottle trap) | Yes | Two hands, room to unscrew and drain |
| Angle valves / stopcock | Yes | Reachable instantly in an emergency |
| Water filter | Optional | Cartridge swap clearance, usually vertical |
| Food waste disposer | Optional | Bulky; needs a nearby power point |
| Bin or pull-out | Optional | Full door swing; conflicts with a disposer |
Compiled reference listing components commonly fitted in the sink bay, based on the Big Bath kitchen range including in-sink food waste disposers and angle valves.
The conflict to watch is a food waste disposer plus a pull-out bin. Both want the centre of the cabinet directly under the bowl, and they rarely coexist comfortably. Decide which one you actually want before the cabinet is made, not after — an in-sink food waste disposer also needs a power point positioned inside the cabinet.
Key takeaway: List everything going under the sink before the cabinet is built, including the power point. Disposers and pull-out bins compete for the same space.
7What to check before you sign off a sink cabinet
Quick Answer: Check five things: carcass material in the sink bay, hinge and runner quality, ventilation provision, a removable or accessible base panel, and whether the pipe cut-outs have been sealed at the edges rather than left raw.
Run through this list with your cabinet maker or in the showroom before committing.
- Sink bay carcass. Confirm the material specifically for that bay, not for the kitchen generally.
- Hinges and runners. These corrode before the carcass does. Stainless or properly coated hardware is worth the small premium here.
- Ventilation. Ask directly how air moves through the cabinet. "It's sealed" is the wrong answer.
- Base panel. A lift-out or replaceable base means water damage costs a panel, not a cabinet.
- Cut-out edges. Raw cut edges on any board material wick water. They must be sealed.
- Spare parts. Check that sink spare parts such as wastes and strainers are available for the sink you have chosen.
Key takeaway: The hardware and the base panel decide how the cabinet ages. Specify both deliberately in the sink bay, even if the rest of the kitchen is standard.
8Conclusion: specify the sink bay separately
The single most useful idea in this guide is to stop thinking of the sink cabinet as part of the kitchen run. It is a wet enclosure containing live plumbing, and it should be specified on its own terms metal or PVC carcass, ventilated cavity, quality hardware, accessible trap and a replaceable base.
Do that and it will still be sound when the rest of the kitchen is due for a refresh, rather than being the reason for one.
9Frequently asked questions
What size cabinet do I need for my kitchen sink?
At least 100mm wider than the sink's overall length, so the countertop cut-out clears the cabinet side panels. A 600mm sink is generally paired with a 700mm cabinet, an 800mm sink with a 1,000mm cabinet.
What is the best material for a kitchen sink cabinet in Malaysia?
Aluminium or SUS304 stainless steel. Both tolerate permanent humidity, neither rusts through, and neither is vulnerable to termites the three conditions that decide how long a sink cabinet lasts here.
Does a sink cabinet need ventilation?
Yes. Trapped humid air is the most common cause of under-sink deterioration, ahead of actual leaks. Ventilation slots or a gap at the plinth let the cavity dry between uses.
Can I put a water filter and a food waste disposer under the same sink?
Sometimes, but they compete for space with the trap and any pull-out bin. Plan the layout before the cabinet is made, and make sure a power point is provided inside the cabinet for the disposer.
Why does my under-sink cabinet smell musty?
Usually condensation and poor airflow rather than a leak. Lag the cold water pipe, add ventilation, and switch to wire shelving so damp cloths and bottles are not sitting on a solid surface.
How deep should a sink base cabinet be?
Around 500–550mm suits most sinks. Check your sink's bowl depth as well a deep bowl in a standard cabinet can leave too little room underneath for a usable shelf.
Planning a kitchen sink and cabinet together?
Bring your kitchen measurements to Big Bath and our specialists will match sink, cabinet, tap and accessories as one set — so the cut-out, the trap and the storage all work the first time.
Talk to a kitchen specialist
