7 Mistakes to Avoid During a Bathroom Remodel

January 28, 2026 8 min readBy General Modernizer
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After completing over 500 bathroom renovations in Nassau County, Queens, and Brooklyn, Our team has seen every mistake in the book. Here are the 7 most common and how to avoid them.

After completing over 500 bathroom renovations in Nassau County, Queens, and Brooklyn, Our team has seen every mistake in the book. Some are minor inconveniences; others are expensive problems that require tearing out completed work. Here are the 7 most common bathroom remodeling mistakes and how to avoid them.

1. Not Waterproofing Properly. Inadequate waterproofing is the most expensive mistake in bathroom renovation. Water that penetrates behind tile can cause mold, rot, and structural damage that may not become apparent for months or years. Always ensure that your contractor uses a proper waterproofing membrane -- not just cement board -- in all wet areas.

2. Choosing Tile Before Finalizing the Layout. Many homeowners fall in love with a tile at the showroom without considering how it will look in their specific bathroom. Always bring tile samples home and view them in your bathroom's lighting before committing. Also consider the grout color -- it has a dramatic effect on the final appearance.

3. Underestimating the Budget. Bathroom renovations almost always cost more than homeowners initially expect. Hidden issues -- outdated plumbing, water damage, subfloor problems -- are common in older Long Island homes and can add significant cost. Always budget a 15 to 20 percent contingency above your contractor's estimate.

4. Hiring the Cheapest Contractor. The lowest bid is rarely the best value in bathroom renovation. Inexperienced contractors may cut corners on waterproofing, use inferior materials, or lack the skills to execute complex tile work. Always verify that your contractor is licensed, insured, and has verifiable references for completed bathroom projects.

5. Ignoring Ventilation. Inadequate bathroom ventilation leads to mold, mildew, and premature deterioration of surfaces. If your bathroom does not have an exhaust fan, or if the existing fan is undersized, include a ventilation upgrade in your renovation plan.

6. Moving Plumbing Unnecessarily. Moving plumbing fixtures -- toilet, sink, shower -- to new locations requires significant additional work and cost. Unless there is a compelling design reason to move plumbing, keeping fixtures in their existing locations will save significant money.

7. Not Planning for Storage. Many bathroom renovations focus on aesthetics and neglect storage. Before finalizing your design, think carefully about where you will store towels, toiletries, cleaning supplies, and other bathroom essentials. Built-in niches, medicine cabinets, and vanity storage should be planned from the beginning, not added as an afterthought.

Avoiding these mistakes starts with hiring an experienced, licensed contractor. Contact General Modernizer for a free consultation with General Modernizer.

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