How to Build a Custom Shower Step-by-Step

When you don’t want the expense and hassle of hiring plumbers or electricians, plan your custom shower setup to use the existing pipework and electrical. However, the current pipework must still connect the shower drain to the drainage pipe. 

When and how you do this depends on whether you incorporate a shower pan or a tiled floor. Often, you do part of the assembly before fitting the shower base or floor tiles and complete the job once the tiles or pan are in place. Follow the manufacturer’s instructions for the drain assembly kit you select.

Lopsided shower base levels can cause drainage issues, pooling water, mold buildup, and leaks. If you're using a shower pan, improper levels cause instability that can result in cracks. You might need to use shims—roofing felt works wonderfully—or add a layer of mortar to level a shower pan.

Applying a waterproof sheet or liquid membrane to the subfloors helps to prevent damage if the shower pan, base, or surrounding seals springs a leak. It also pays to apply a waterproof membrane to the walls and any wooden framing and cement board panels. 

Apply the shower waterproofing generously a few feet outside the shower area to prevent damage from splashes or overflows.

Installing a shower pan is more straightforward than building a walk-in shower base. However, a tiled concrete mortar base often looks more stylish and streamlined than a prefabricated acrylic or fiberglass pan.

If you opt for a custom base, you’ll need to decide if you want a curb or curbless design. A curb design uses a barrier to keep the water in the shower area, and it’s easier to install. Curbless showers allow you to ditch the door, creating a feeling of openness. However, the design requires the shower base to be lower than the rest of the bathroom floor, with a slope of 1/4 inch per foot to 1/2 inch per foot (2% to 4%) toward the drain.

The framing of your custom shower will depend on the design, shape, and materials you select. Sometimes waterproof fiber cement boards need to be screwed to the stud framing. Space the studs to accommodate your faucet and showerhead, and use additional horizontal bracing to secure these fittings. 

When planning your shower tile installation, consider size and material, and test the layout before setting them with adhesive. Large tiles can make a small bathroom seem bigger, but they’re more challenging to cut and fit. Ceramic is often considered the best tile type for bathroom floors, but stone and porcelain are popular alternatives.

Laying tiles involves prepping and spreading mortar, setting the tiles using tile spacers, filling the joints with grout, and sealing once the grout sets.

Now’s the time to fit the showerhead, faucet, and shelves. The beauty of building a custom shower is you can get creative with design and fixtures. There’s a wide range of showerheads to choose from, including smart models, rain showers, and water-conserving low-flow models.

If you haven’t gone for a doorless custom shower, now’s the time to add one. The manufacturer’s installation instructions depend on the type of shower door you select. Typically, shower door installation involves cutting the interlocking jamb pieces to size, affixing them to the shower stall and door, and installing a base track and seal at the base of the door.