By Katie Butler | Katie Butler Real Estate
Thinking about remodeling your bathroom before selling your home? Or maybe you’re tackling a bathroom renovation just because it’s time? Either way, there are a few costly mistakes I see over and over again — and they almost always get flagged during a home inspection.
After nearly a decade as a top-producing Sacramento Realtor and hundreds of home inspections under my belt, I can tell you the same issues come up again and again. Here are the four most common bathroom remodel mistakes — and how to avoid them.
1. Improper Fan Venting
Bathroom exhaust fans are essential for removing moisture, and excess moisture is one of a home’s biggest enemies. Without proper ventilation, bathrooms become breeding grounds for mold and mildew, and over time that moisture can damage your walls, ceilings, and even the structure behind them.
Here’s the mistake I see constantly: homeowners install a fan, but the vent terminates in the attic instead of through the roof. I can’t tell you how many times my home inspector has called this out. Venting into the attic doesn’t solve the moisture problem — it just moves it somewhere you can’t see it, which is actually worse than having no fan at all. Mold growing unchecked in your attic can become a serious and expensive issue.
The fix: Make sure your bathroom exhaust fan vents all the way through the roof to the exterior of your home. And while a bathroom with a window technically doesn’t require a vent fan, it’s still a smart addition.
2. Ignoring Dry Rot Under the Floor
Most bathroom remodels happen in older homes, and once a home is past the 30-year mark, there’s a good chance a slow leak from the sink, toilet, or shower has been quietly doing damage. Water sitting on wood creates the perfect environment for fungi, which causes the wood to rot and spread if left untreated.
The most common spot? The subfloor — the plywood layer underneath your tile or flooring. Too many homeowners lay beautiful new tile right on top of rotted subfloor because they don’t want to spend the extra money on what no one will see. Then it shows up during the home inspection, and suddenly you’re dealing with a repair that’s far more disruptive and expensive than it would have been during the original remodel.
The fix: When your bathroom is already torn apart and contractors are on-site, that’s the time to inspect and replace any damaged subfloor. It’s faster, cheaper, and far less of a headache than addressing it later.
3. Missing GFCI Outlets
Just like in kitchen remodels, this one gets overlooked all the time. Bathrooms require GFCI (Ground Fault Circuit Interrupter) outlets — those are the outlets with the small “test” and “reset” buttons on them. They’re fast-acting circuit breakers designed to cut power instantly in the event of a ground fault, protecting you from dangerous electrical shock.
GFCI outlets are required by code in bathrooms, kitchens, garages, and anywhere within six feet of a water source. If your bathroom remodel includes new outlets or electrical work and the GFCI protection is missing, it will absolutely get called out during a home inspection.
The fix: Have a licensed electrician install GFCI-protected outlets in every bathroom. It’s a small investment that keeps your family safe and your future home sale smooth.
4. Flexible Drain Pipes Under the Sink
This one is a telltale sign that the plumbing wasn’t done by a professional. If you look under your bathroom sink and see a flexible or accordion-style drain pipe, there’s a problem. Those corrugated pipes collect hair, dirt, and grime in their ridges, which leads to slow drains and backups over time.
People tend to use these flexible lines because they’re easy — they make it simple to connect misaligned pipes or compensate for not having the right fittings on hand. But as my home inspector likes to say, a flexible drain pipe is a sure sign the work wasn’t done by a licensed plumber.
The fix: Use proper rigid PVC drain pipes with the correct fittings. If the plumbing doesn’t line up easily, that’s a sign you need a professional — not a workaround.
The Bottom Line
The best way to avoid all four of these bathroom remodel mistakes? Hire licensed professionals. A licensed electrician should handle your electrical work. A licensed plumber should handle your plumbing. And when it’s time to sell your home, an experienced Realtor should always be the one guiding you through the process.
Trust me — a little investment in doing things right during a remodel saves a lot of stress (and money) when it’s time to sell.
Have questions about how your home’s condition might affect its value? Let’s chat — I’m always happy to help you think through your next move.
Katie Butler is a Sacramento Realtor with over 12 years of experience specializing in the Pocket-Greenhaven, Land Park, Curtis Park, and East Sacramento neighborhoods. She leads Katie Butler Real Estate with Better Homes and Gardens Real Estate.