Tub to Shower: Common Mistakes & How to Avoid Them

Conversionfrom a bathtub to a shower is one of the most popular remodeling projects for homeowners in the Bay Area. A tub to shower remodel not only makes the bathroom feel modern and spacious, but it also improves accessibility and boosts home value. Whether you’re planning a walk-in shower remodel or a simple bathtub conversion to shower, there are important details that homeowners often overlook.

In this article, we’ll cover the most common mistakes people make during a tub conversion to shower, explain the hidden costs and code requirements, and share how to avoid problems that could derail your remodel. If you’re searching for bathroom remodel contractors in Bay Area, CA this guide will help you ask the right questions and plan your project with confidence.

Mistake #1: Assuming It’s a Simple Swap

Many homeowners think a shower to bathtub conversion or vice versa is just about changing fixtures. In reality, a bathroom tub remodel involves plumbing, waterproofing, tiling, and sometimes structural changes. Such project absolutely requires pulling permits and city inspections. Treating it as a “simple swap” will result in leaks, poor drainage, and failed inspections.

Always plan any bathroom renovations as a full bathroom remodel project, not just a cosmetic upgrade. This way of thinking itself won’t affect the cost of your project much, but will 100% increase quality and safety of your project.

Tip from RISE 

Mistake #2: Overlooking Code-Required Drain Pipe Upgrades

Here’s a technical but critical detail: in California, showers must have a minimum 2-inch drain line, while tubs usually use only a 1.5-inch pipe. During a tub to shower remodel, the old tub drain is not sufficient.

That means the contractor must usually run a new 2-inch drain line from the closest plumbing point, typically the toilet. This requires exposing the flooring between the toilet and the new shower. If your bathroom is on a concrete slab, the process becomes more invasive and costly since concrete has to be cut and patched.

If you want a quick walk-in shower conversion without disturbing the rest of the bathroom, this can be problematic. Even if the plan is to only replace the tub, flooring will need to be opened to install the proper drain. Skipping this step not only violates code but also creates major drainage issues.

During initial estimate ask your contractor for details on how exactly they plan to handle the drain upgrade and how much of additional cost it might take in your specific case.

Tip from RISE 

Mistake #3: Ignoring Waterproofing Details

One of the top issues we see in failed bathroom remodel Bay Area projects is improper waterproofing. Cutting corners with shower pans, membranes, or wall prep often leads to leaks and costly hidden water damage.

According to the California Plumbing Code, shower floors must be lined with a waterproof membrane that extends at least 2 inches above the finished dam/threshold. Walls around the shower or tub must have waterproof material installed to a minimum height of 6 feet above the floor (or higher if the showerhead is mounted above that). This ensures all areas exposed to water spray are fully protected.

Don’t skip any waterproofing steps, or make sure your contractor doesn’t. Don’t use drywall instead of cement board with waterproofing, because it will fail within a few years, will start leaking and will cause very costly damage. Proper waterproofing – successful bath remodel.

Tip from RISE