Avoiding Disaster: Common Mistakes in DIY Sink Replacement

Replacing a kitchen sink yourself can be empowering—but it’s also where many homeowners accidentally create bigger problems. Most sink disasters don’t happen immediately; they show up weeks later as leaks, swelling countertops, or foul odors. Knowing the common mistakes helps you avoid them entirely.

One of the biggest errors is skipping surface prep. Old caulk, grease, and debris prevent proper sealing. Even the best sink will leak if it’s installed on a dirty or uneven surface. Prep isn’t optional—it’s foundational.

Another common mistake is using the wrong sealant. Plumber’s putty is often misused where silicone is required, especially on laminate countertops. This leads to water infiltration and countertop damage over time.

Improper tightening is another issue. Over-tightening sink clips or plumbing fittings can crack laminate, warp stainless steel, or strip threads. Tight doesn’t mean forced—it means secure and balanced.

Finally, many DIYers underestimate plumbing alignment. Misaligned P-traps or supply lines lead to slow leaks that go unnoticed until damage is done.

At I Hate My Sink, we love confident DIY projects—but we also know when professional help saves money, stress, and cabinets.

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