About three months after a tenant moved into one of my units, she sent me a video of the kitchen faucet wobbling side to side every time she turned it on, like it was about to tip into the sink. I’ve fixed this exact problem at least 14 times across my 9 rental properties over the past 15 years, and once you know where to look, it takes about 20 minutes from start to finish.
A plumber in my area charges a flat 8,000 yen just to show up, and once you add parts and labor, a callout for something as simple as a loose faucet base can run 12,000 to 15,000 yen for maybe 15 minutes of actual work. I’d rather put that money toward new flooring, so I handle this one myself every time.
Why Kitchen Faucets Come Loose in the First Place
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Almost every single-handle kitchen faucet is held to the counter or sink deck by one mounting nut underneath, tightened onto a threaded shank that runs up through the deck plate. Every time someone leans on the faucet to fill a pot, or grips it while doing dishes, that nut takes a tiny bit of side-to-side stress. Over 5 to 10 years of daily use, vibration and temperature swings from hot and cold water running through the lines let that nut back off a fraction of a turn at a time. By the time a tenant notices the wobble, the nut is usually only finger-tight, sometimes not even touching the deck plate at all.
What You’ll Need Before You Start
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This is a short list, and if you own even a basic tool kit you probably already have most of it. I keep a dedicated bag with these items just for faucet calls, because I’ve needed them often enough to justify it.
- Adjustable wrench or a basin wrench (a basin wrench makes the tight space under the sink much easier)
- A flashlight or headlamp, since the space under most kitchen sinks is dark even with the cabinet doors open
- Plumber’s putty or silicone sealant, in case the base gasket has dried out
- An old towel to catch drips
- A small bucket, just in case you need to disconnect a supply line
Step-by-Step: Tightening the Faucet Base
First, shut off both the hot and cold water valves under the sink, then open the faucet to release any remaining pressure in the lines. Clear out whatever is stored under the sink so you can actually see and reach the mounting hardware, and lay the towel down to catch drips. Locate the mounting nut, which sits directly below the faucet body on the underside of the deck plate. A basin wrench lets you reach up into that tight, awkward space and grip the nut from an angle a regular wrench can’t manage. Turn the nut clockwise by hand first until it stops moving freely, then give it another quarter turn with the wrench, no more. Over-tightening can crack an older plastic deck plate, and I’ve seen that happen when a previous tenant tried to fix it themselves with a pipe wrench. Once it’s snug, wipe away any old, dried-out plumber’s putty around the base and lay a fresh, thin bead if the seal looks worn, then turn the water back on and run the faucet for a minute while checking underneath for any drips.
When It’s Not Just the Nut
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Adhesives & Sealants
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Sometimes tightening the nut doesn’t solve it, and that usually means something else has failed. If the deck plate itself is a cheap, thin plastic piece rather than metal, 10 or more years of tightening and loosening cycles can crack it right around the mounting hole, and no amount of tightening will hold. Corroded or stripped threads on the shank are another common culprit, especially in units where the sink cabinet has had any water damage in the past, since moisture speeds up corrosion on the metal fittings. In both of those cases, replacing the whole faucet unit is the more reliable fix. A basic single-handle kitchen faucet runs about 6,000 to 9,000 yen at a home center here, and swapping the whole unit takes maybe an hour once you’ve done it a couple of times.
What This Saves You Over Time
If you already own a basin wrench, the tightening fix costs next to nothing, maybe 500 yen for a fresh tube of plumber’s putty, and the tools pay for themselves after the first repair. Compare that to the 12,000 to 15,000 yen a plumber would charge for the same 20-minute job, and across 9 properties over 15 years, I estimate this one repair alone has saved me well into six figures in yen. It’s a small, unglamorous fix, but those are exactly the kind of repairs that quietly protect your margins as a landlord.
That’s the approach I use across all 9 of my properties: check the simple mechanical cause first, keep the right tools on hand, and only call in a professional once you’ve ruled out the easy fix yourself.
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