Best locks for under-sink cabinets: the one cabinet where the lock type is decided for you

Empty it first, then lock it

Poison Control's national data for 2024 has household cleaning substances among the most common exposures reported for young children, and the American Academy of Pediatrics' childproofing guidance says the same thing every year: the first move is to relocate, not to latch. Under the sink is where almost every household keeps the bleach, the drain cleaner, the dishwasher pods and the oven spray, and it is at exactly the height a crawler meets first.

A lock is a layer on top of that decision, not a substitute for it. Every product on this page can be defeated eventually by a determined two-year-old, or left unlatched by a tired adult, and the consequence of that failure is entirely decided by what is behind the door. Cleaning chemicals go up high. What stays under the sink should be the stuff you would rather a toddler did not reach, not the stuff that would put them in an ambulance.

Once the cabinet holds sponges, bin bags and a bucket, the lock is doing the job it is good at. And keep the Poison Control number on the fridge either way.

Three things that make this cabinet different

The doors meet in mid-air. Most kitchens run a pair of doors under the sink with no centre stile, because the plumber needs the full opening. A magnetic or spring latch works by catching the door against a fixed part of the carcass, and on a stile-less pair there is no fixed part in the middle. That single piece of joinery decides most of this page.

The waste pipe is in the way. Even where you can screw into the carcass, the sink trap, the supply lines and sometimes a waste-disposal unit occupy the top six inches of the cabinet, which is exactly where a latch wants to go. Check what is behind the wood before you put a screw through it; a screw into a supply line is a worse day than an unlocked cabinet.

It is the damp cabinet. A slow trap weep, a bucket of wet mop heads, and condensation off cold pipes mean the under-sink box runs humid in a way no other cabinet does. Adhesive is a chemical bond and humidity is what breaks it slowly. This is the one cabinet where a screw, or no fixing at all, genuinely beats tape.

How we ranked these

Toddler resistance carries 30 percent on this page, higher than anywhere else on the site, because of what is behind the door: the downside of a defeated latch here is a poisoning rather than a mess. Standards stays at 25, which is what puts the Safety 1st magnetic set clearly first, since it is the only product here whose maker states a JPMA certification. ASTM F3492 is the standard that covers child safety locks and latches for cabinet doors and drawers, and it is worth knowing that almost nobody in this category claims it by name. Reversibility drops to 5 because renters are already covered by three of these four. The weights are printed under the picks; the rubric is on how we choose.

Every lock here was confirmed on sale on the manufacturer's own store on September 26, 2026.

Which lock your doors allow

Open the cabinet and look at the middle. This takes ten seconds and it removes most of the choice.

There is a centre stile, or a solid rail behind the doors. You have the full range. Magnetic locks are the best answer because they are invisible, they cannot be picked by hand, and the key lives on the fridge. Fit them and move on.

The two doors meet with nothing between them. Magnetic and spring latches are out for the middle pair, and the answer is something that joins the two doors to each other: a strap across the faces or a slide over the two handles. Both are visible and both work.

The doors have knobs or D-handles. A sliding lock over the two handles is the cheapest, fastest, most reversible fix in this whole category, and it is the only one that is completely immune to damp because nothing sticks and nothing is drilled. It also fails the moment somebody removes it to get at the bin bags and does not put it back.

The doors have no hardware at all. Handle-less slab doors defeat both sliding locks and most straps, and the answer is a magnetic lock if there is anything to fix to, or an adhesive latch if there is not. That whole decision tree is in cabinet locks for knobs, handles and no hardware.

The two finalists, side by side

These are not really competitors; they are answers to two different cabinets. Safety 1st gives you the only stated certification in the category and a lock nobody can see, at the cost of needing something solid to mount to and a key you will lose at least once. Wappa gives you ten adjustable straps for $12.99 that work on the stile-less pair where the magnetic lock cannot, at the cost of a visible strap on the front of your kitchen and an adhesive pad in the dampest cabinet in the house. Read the middle of your cabinet, then pick.

What the damp does to adhesive

Three of these four fix with tape, so this is worth doing properly once rather than three times.

Degrease first, and not with kitchen spray: most of them leave a silicone or wax film that adhesive will not bond to. Isopropyl alcohol on a cloth, then let it flash off. Warm both the surface and the tape if the kitchen is cold, because 3M-style acrylic adhesives need a reasonable surface temperature to wet out. Press firmly for thirty seconds, then leave it overnight before the first proper pull. And check the inside of the cabinet for an actual leak while you are down there: if the base board is soft or stained, no lock is going to stay stuck to it, and you have a plumbing job rather than a babyproofing job.

The longer version of this, including which surfaces never take adhesive, is in magnetic vs adhesive cabinet locks and babyproof cabinets without drilling.

How many you need for one cabinet

Two, not one. A stile-less pair of doors needs the pair joined, and if you only lock one leaf the other still swings. A cabinet with a centre stile needs one latch per door. Buy in a pack anyway, because once you have done the sink you will do the cleaning cupboard, the bin cupboard and the drawer with the knives in it, and single-unit locks cost three times as much per lock.

The two things next to the sink that also need doing

The dishwasher is the other half of this hazard and it does not have a cabinet lock. Detergent pods are the single most concentrated thing in the room and the dispenser sits at floor level behind a door a toddler can open. Most dishwashers have a control lock in the settings; use it, and keep the pods up high with the bleach.

The bin is the other one. A kitchen bin at floor level holds broken glass, tin lids and food waste, and a strap lock across the lid is the same $1.30 part as the cabinet. The rest of the room, in the order a crawler meets it, is in babyproofing the kitchen.

Who should skip all of these