5 Things You Should Never Skip During a Bathroom Remodel

A bathroom remodel is a big deal. People spend big bucks on improving the looks and functionality of their bathroom by adding fixtures, replacing them, and making aesthetic modifications to the place.

However, during the remodeling process, there are a number of things that you should not skip, no matter what. These are important steps, without which the entire project can end catastrophically.

In this post, we’re going to tell you about the 5 things that you should never skip during a bathroom remodel. This is especially important to keep in mind if you’re doing the remodel DIY.

1. Proper Waterproofing

Tile is not waterproof. Grout is not waterproof. Water gets through both and sits behind your walls. Once it's trapped, mold grows, wood rots, and subfloors deteriorate.

Waterproofing happens before tile installation. A waterproof membrane goes over the substrate. This membrane stops water from reaching framing, insulation, and flooring.

Critical areas that must be waterproofed:

• Entire shower enclosure, floor to ceiling

• Tub surrounds and adjacent walls

• Bathroom floors, especially near showers and tubs

• Any wall that gets direct water contact

• Penetrations for plumbing fixtures, drains, and mixing valves

Most failures happen at seams, corners, and penetrations. The membrane must overlap at seams. Corners need reinforcement fabric. Drain flanges need proper integration with the membrane.

Skipping waterproofing saves maybe $500 during construction. Fixing water damage later costs $5,000 to $15,000, depending on how far it spreads.

Long-Term Damage When Waterproofing Is Skipped

Water travels. It finds studs, joists, and subfloors. Wood stays wet and rots, while mold spreads into walls. The damage becomes structural.

You won't see it until the tile starts cracking, floors feel spongy, or ceilings below the bathroom show stains. By then, the fix requires demolition.

2. Adequate Ventilation

Moisture doesn't just come from showers. It also comes from steam and condensation that settles on different bathroom surfaces.

Steam and condensation can be avoided if there is proper ventilation in the bathroom.

If there is no ventilation, the area becomes damp.

Mold grows in damp environments. Paint peels and caulk can start disintegrating.

Bathrooms without ventilation deteriorate noticeably faster than those with it.

When it comes to ventilating via windows, it’s usually not enough. They help during mild weather, but they don't remove moisture consistently. Most people don't open windows in winter. Even when open, windows don't create enough airflow to clear steam quickly.

Exhaust Fan Sizing and Placement Basics

Exhaust fans are rated in CFM, which stands for cubic feet per minute. The fan needs to move enough air to clear moisture in a reasonable time.

Here's a simple sizing guide:

Place the fan near the shower or tub where steam concentrates. Avoid placing it directly over the shower head where water spray can reach it.

When upgrading ventilation is necessary:

• Existing fan is weak or noisy

• Bathroom is being expanded

• Adding a second shower or tub

• Previous mold issues were present

• Fan vents into the attic instead of outside

Venting into an attic is a code violation in most areas and a guaranteed mold problem. The duct must terminate outside the home.

3. Plumbing Access and Shutoff Valves

You should add plumbing access and shutoff valves during the bathroom remodel so that future maintenance is easy.

Most older bathrooms don't have shutoff valves for each fixture. Replacing a faucet means shutting off the main supply. That's inconvenient. Adding shutoff valves during a remodel costs almost nothing. Cutting into finished walls later to add them costs plenty.

Where shutoff valves should be installed:

• Under each sink, one for hot and one for cold

• Behind or beside each toilet

• At the shower and tub mixing valves, accessible through an access panel

• At any point where future repairs are likely

Why Access Matters

Shower and tub valves sit inside walls. If a cartridge fails or a seal leaks, you need to reach the valve without demolishing tile.

An access panel solves this. It's a small removable panel on the opposite side of the wall, usually in a closet or hallway. The panel allows access to the valve body, shutoffs, and connections.

Building one during construction is easy. Cutting through a finished wall later is not.

Tip: If the back side of your shower wall faces a closet, install an access panel there. You'll thank yourself later.

4. Electrical Safety and Lighting Planning

Bathrooms are wet environments. Electricity and water don't mix. Code requirements exist to prevent shocks and electrocution.

GFCI Requirements

GFCI outlets detect ground faults and shut off power instantly. All bathroom outlets must be GFCI-protected. This includes outlets near sinks, inside cabinets, and anywhere within six feet of water sources.

A single GFCI outlet can protect multiple standard outlets downstream. Alternatively, a GFCI breaker at the panel protects the entire circuit.

Proper Outlet Placement

Outlets need to be accessible but safe. Place them near mirrors for hair dryers and electric razors. Avoid placing them where water spray from the sink can reach them.

Code requires at least one outlet within three feet of the outside edge of each sink basin. If you're adding a double vanity, plan for outlets on both sides.

Layered Lighting

Bathrooms need three types of lighting:

1. Task lighting around mirrors for grooming and makeup

2. Ambient lighting for general illumination, usually a ceiling fixture

3. Shower lighting inside the shower enclosure

Single overhead lights create shadows on faces. Sconces or backlit mirrors beside the vanity provide even light for tasks.

Shower lights must be rated for wet locations. Recessed cans need proper housings. Surface-mount fixtures need sealed lenses.

Plan lighting before walls are closed. Running wires later requires cutting into finished surfaces. Decide on fixture locations, switch placements, and dimmer controls during the rough-in phase.

Here's a breakdown of common bathroom lighting zones:

5. Plan for Vanity Space (Even If You're Not Installing One Yet)

Bathrooms change over time. Storage needs increase. Pedestal sinks look clean but offer zero storage. Wall-mounted sinks work until you need somewhere to put toiletries, cleaning supplies, and extra towels.

Leaving room for a vanity during the remodel gives you flexibility later. You don't have to install one immediately, but planning the space prevents regret.

Why Vanity Space Matters

A decent, well-picked bathroom vanity provides storage and counter space. It hides plumbing. It anchors the room visually. Bathrooms without vanities force you to add shelving, cabinets, or freestanding furniture that clutters the space.

If you're renovating now and skipping the vanity to save money, that's fine. Just make sure the plumbing and layout allow for one later.

Planning considerations:

• Leave at least 30 inches of wall space for a standard vanity

• Position plumbing supply lines and drains at standard vanity height (typically 21 inches from the floor)

• Avoid placing switches, outlets, or other fixtures where a vanity would need to sit

• Keep electrical outlets above the planned counter height for accessibility

What Happens When You Don't Plan Ahead

Adding a vanity later becomes difficult if the plumbing sits too high or too low. You'll need to move pipes, patch walls, and possibly retile. That turns a simple upgrade into a full project.

Electrical outlets placed at the wrong height end up behind the vanity or inaccessible. Light switches end up inside the vanity footprint. Towel bars block where the vanity should go.

Tip: Even if you love your pedestal sink now, think about resale value. Most buyers prefer vanities for storage.

Installing Blocking for Future Vanities

If walls are open during construction, install blocking, i.e., horizontal wood supports between studs. Blocking provides a solid attachment point for vanity mounting brackets.

Standard vanity blocking sits 30 to 32 inches above the finished floor. This allows the vanity to hang securely without searching for studs or using hollow-wall anchors.

Here's what to block for if you're leaving options open:

Blocking costs almost nothing during construction. Adding it later requires opening walls.

Rough-In Considerations

Vanity plumbing sits inside the cabinet. The supply lines and drain should terminate at the right height and position so they're hidden once the vanity is installed.

Standard rough-in measurements:

• Hot and cold supply lines: 21 inches above finished floor, 4 inches apart

• Drain line: 16 to 20 inches above finished floor, centered between supply lines

If you're installing a pedestal sink temporarily, stub out the plumbing at vanity height anyway. Cap the lines. When you're ready to switch, the plumbing is already positioned correctly.

When Space Is Tight

Small bathrooms have limited wall space. You might not have room for a full 48-inch double vanity. That's fine. Plan for what fits.

A 24-inch vanity still provides storage and counter space. Wall-hung vanities save floor space and make small bathrooms feel larger. Corner vanities use space that's otherwise wasted.

The key is reserving the space and roughing in plumbing correctly. The specific vanity style can be decided later.

Wrapping Up

Hidden work determines whether your bathroom lasts five years or fifty. Waterproofing prevents rot. Ventilation prevents mold. Access panels prevent demolition. Electrical planning prevents code violations. Proper slope prevents drainage failures.

If you take care to perform all the steps that we’ve mentioned in the post above, you’ll be able to make sure that your remodel lasts for some time to come, instead of needing to be redone after just a couple of years.

FAQs

Is waterproofing required by code?

Yes, in most jurisdictions. The International Residential Code requires waterproofing in shower and tub areas. Local codes may have stricter requirements. Check with your building department.

Can I reuse existing ventilation?

Only if the existing fan meets current CFM requirements for your bathroom size and vents properly to the outside. Most older fans are undersized, noisy, and inefficient. Replacing is usually smarter.

Do I need shutoff valves for each fixture?

Code doesn't always require them, but they're worth installing. Shutoff valves make repairs faster, cheaper, and less disruptive. They cost about $10 per valve during construction.

How much slope does a shower need?

Minimum 1/4 inch per foot toward the drain. Most installers aim for slightly more to ensure water moves quickly. Too much slope makes the floor feel awkward. Too little causes pooling.

When should electrical changes be planned?

Before drywall goes up. Once walls are closed, adding outlets, switches, or lighting fixtures requires cutting into finished surfaces. Plan outlet placement, GFCI protection, and lighting layout during the rough-in phase.