Primary Bathroom Shower Dimensions: A Guide to Sizing Your Shower

The primary bathroom is the place homeowners go all-out—after all, you’re using it every day to get ready or wind down. It’s not just about the quality of fixtures and finishes. An ideal shower design makes the most out of the available space. Primary bathroom shower dimensions are slightly larger for added comfort, but there are a range of common sizes for different bathroom configurations. 

What Are the Standard Primary Bathroom Shower Dimensions?

Primary bathroom shower dimensions range from 30 to 48 inches in width and 30 to 72 inches in length. That said, there are some standard sizes, especially if you’re buying a prefabricated shower pan. 

Square Shower

The standard dimensions for a square-shaped shower in a primary bathroom are 36-by-36 inches. This is 6 inches larger than the minimum shower pan size required by most building codes. Many homeowners find 42-by-42 inches to be more comfortable and stretch their design to 48-by-48 inches if they have the space. 

Rectangular Shower

Though you’ll find a range of different widths, the standard dimensions for a rectangular primary shower are:

• Small: 30-by-60 inches

• Medium: 36-by-60 inches

• Large: 42-by-60 inches

The larger size can better accommodate walk-in showers with luxury features, like dual showerheads or a shower bench. Rectangular showers are better for larger bathrooms, layouts with an alcove, or tub-shower combos. If you’re planning a custom build, you may want to go slightly larger for added comfort. Your shower installer can help you pick the best shower size for your goals. 

Primary Bathroom Shower Dimensions by Type

The ideal primary bathroom shower dimensions depend on the type of shower. Prefabricated showers come in standard sizes, while you can build a custom walk-in shower with any dimension that suits your space. There is less leeway with other types of showers, like tub-shower combos or accessible showers.

Prefabricated Showers 

Prefabricated showers, which use a standard shower pan, can be as small as 30-by-30 inches, but the average size is 36-by-36 inches. Here are the most common dimensions for a prefab shower in a primary bathroom:

• Small: 32-by-32 inches

• Average: 36-by-36 inches

• Large: 42-by-42 inches

• Rectangle: 36-by-60 inches

Walk-In Shower Sizes

Walk-in showers for a primary bathroom are 36 to 48 inches on the smallest side and 36 to 72 inches on the largest side. It depends on whether you prefer a rectangle or a square shape. Here are some of the most common dimensions:

• Small (Rectangle): 36-by-42 inches

• Small (Square): 36-by-36 inches

• Large (Rectangle): 48-by-48 inches

• Large (Square): 42-by-60 inches

• Extra Large: 40-by-72 inches 

Tub-Shower Combo Sizes

Tub-shower combinations are always rectangular to accommodate the tub, but they range from 30 to 36 inches in width to 48 to 60 inches in length. Here are the most common sizes:

• Small: 36-by-48 inches

• Average: 30-by-60 inches

• Large: 36-by-60 inches

ADA Shower Sizes

If you want to build an accessible shower, the Americans with Disabilities Act (ADA) recommends a shower no smaller than 36-by-36 inches. For wheelchair-accessible showers, the base must be rectangular and a minimum of 30-by-60 inches. 

Corner Shower Sizes

Corner showers are uncommon in a primary bathroom but may be paired with a freestanding tub in some bathroom layouts. They have a curved edge to fit snugly into a corner and take up the smallest amount of space possible. Sizes range from 32-by-32 inches to 48-by-48 inches. For a primary bathroom, consider larger sizes for comfort. 

How to Measure the Right Shower Size for a Primary Bathroom

When you hire a local shower installer, they’ll evaluate your primary bathroom and help you plan the best shower size. Your pro will measure the shower space, but if you want to get an idea before you consult them, you can measure the space yourself. 

1. Determine the location: Decide where you want to place your shower. It’s best to put your shower where you already have the plumbing. This dramatically cuts down on the labor required, since relocating plumbing is intensive and costly.

2. Measure the width of the space: Grab your tape measure and measure the width of the space for your shower—whether it’s an alcove, corner, or back wall. You’ll need a minimum of 30 inches.

3. Measure the length of the space: Measure the length of where you plan to put your shower. You’ll need a minimum of 30 inches for a walk-in shower or shower stall and a minimum of 60 inches for a standard tub-shower combo (though you can find smaller soaking tubs).

4. Measure the depth of the space: If you plan to install a prefabricated shower pan or tub, the depth (or the height of the tub) is set based on the model. You can find it in the product information. Otherwise, you’ll need to measure the depth of the space so you can plan the shower base installation. Most showers range from a depth of 1 to 6 inches, sloped 1/4 of an inch for every horizontal foot toward the drain.

5. Measure the height of the space: Since you’ll need to order or build shower walls and a shower door (depending on design), measure the height of the space. Showers are 80 or 84 inches tall, measured from the top of the shower floor.

6. Measure the clearance: You’ll need enough clearance to get in and out of your shower. This will change depending on whether you have a shower door that swings out or if you’re building an accessible or roll-in shower. At a minimum, you should have 24 inches of clear floor space in front of the shower. 

Factors That Influence Primary Bathroom Shower Dimensions

Before choosing the dimensions of a shower in your primary bathroom, consider a few different factors. While layout may limit your options, also consider your preferences and accessibility needs, the shower type and style, and your overall budget. 

Bathroom Layout

The bathroom layout will determine the location and size of your shower. You’re limited by the size of the bathroom, the location of your plumbing, the size of the alcove, and the placement of other fixtures in the space, like the toilet and sink. 

Type of Shower

The type of shower can impact the dimensions. You have more flexibility with a walk-in shower versus a tub that has standard dimensions. Prefabricated showers are only sold in standard sizes, but custom showers can be made in any size (as long as it meets building code). 

Personal Preference

Your shower should be comfortable to use. You may prefer a certain shape or features that require a certain amount of space. For example, would you be content with a corner shower on the smaller side, or are you dreaming of a tub-shower combo so you can read in the bath? Consider what you personally want before choosing a size.

Budget

The larger the shower, the more you’re going to pay. The average walk-in shower costs anywhere from $6,000 to $12,000, but you could spend more on an extra-large shower made with luxury finishes. Prefabricated showers are the most budget-friendly, but you’re limited to the standard sizes. 

Style

The style of your shower will also determine the size. If you want swinging doors or a glass enclosure, you’ll need a certain amount of space to allow the door to swing open or for mounting the glass. Similarly, added features like a bench or extra showerheads require more space. 

Accessibility 

If your home is a residential property, you don’t necessarily need to follow ADA guidelines, but they’re an excellent benchmark if you’re trying to build an accessible shower. These guidelines have strict measurements for dimensions and clearance, along with added features and specifications, like the spacing of grab bars and the height of fixtures.

If you’re following universal bathroom design, call a contractor who specializes in building accessible bathrooms. They’ll also understand the requirements for the accessible shower you need. 

What to Do if You Choose the Wrong Size?

So what happens if you measure the wrong dimensions for your shower? You may find that your shower is too small to be comfortable or too big to fit in the space. This isn’t necessarily an issue if your contractor can order more materials or cut the existing materials to size, but this is more difficult (or potentially impossible) with a prefabricated shower. You may need to return the materials and order the correct size or move plumbing to fit precut holes for the drain and shower controls.

If the size is seriously off, you may not be able to salvage the prefab shower and will have to start over. The best way to avoid this is to hire a qualified plumber who can do the job properly the first time around.