What Is a Steam Shower? What You Should Know Before Installing One

A steam shower is one of the most popular of these upgrades because it delivers real spa-like relaxation at home. Before deciding whether to add one to your own bathroom, it helps to understand how it works, what it costs, and what to expect during installation. This guide walks through everything you need to know.

What Is a Steam Shower?

A steam shower is a fully sealed shower enclosure paired with a steam generator, giving it the same functionality as the steam rooms you would find in a spa or wellness club. When activated, the space fills with warm vapor, turning an ordinary shower into a therapeutic session.

While it is easiest to plan a steam shower during new construction, the upgrade can also be added to an existing shower. To convert an existing stall, you will need to install a steam generator and make sure the enclosure is properly insulated, sealed, and vapor-tight so that steam stays inside.

How Do Steam Showers Work?

The steam generator, which is usually about the size of a small suitcase, is installed somewhere close to the bathroom, such as inside a nearby closet or within a wall cavity. It needs a water supply line and an electrical connection, since it uses electricity to heat water.

A dedicated pipe runs from the generator to the shower enclosure. Water travels to the generator, where it is heated to boiling (around 212°F or 100°C) to produce vapor. That steam then travels through the pipe and enters the shower through a steam head mounted on the wall.

Even though the water itself is heated to boiling, the interior of the shower does not exceed roughly 120°F, assuming the built-in sensors are working properly. This keeps the experience safe and comfortable for users.

Many homeowners go a step further and layer in additional spa-style features, such as chromotherapy lighting (colored LEDs) or aromatherapy with essential oils, to create a more complete wellness experience.

Steam Shower Pros and Cons

How to Install a Steam Shower

Prefab steam shower kits are the most budget-friendly path. Keep in mind, though, that beyond the kit itself you will still need a contractor, plumber, and electrician to handle installation. If you want to take the DIY route, you will still need a licensed plumber and electrician to do the hookups safely.

Prefabricated units typically cost between $2,800 and $7,100, and most include the steam generator, fittings, steam heads, and the shower insert (walls, doors, base, and drain). Some higher-end kits go further by bundling in a full showerhead, a ceiling-mounted rainfall shower, body sprays, and even a built-in seat.

On average, the starting prefab model measures roughly 9 feet by 7 feet. Labor costs vary based on your region, but they generally start from around $500 and up.

Existing Shower Costs

If you already own a shower enclosure that can be properly sealed and vapor-locked from the rest of the bathroom, you can often skip the full kit. In that case, you buy the steam generator, steam head, and control panel separately and have them integrated into your existing space.

The average cost of converting an existing shower into a steam shower is around $4,300, and this figure covers the unit itself, the generator, and installation labor.

Customized Steam Shower Costs

A fully custom steam shower is the most expensive option, but it may be the only realistic route if your bathroom has unusual dimensions or if you want specific design choices that a prefab kit simply cannot deliver, such as premium materials, high-end finishes, or smart-home style controls.

Beyond the steam generator and the standard shower fittings (drain, base, shower heads, body sprays, and thermostatic valve), there are several extra costs to plan for with a custom build.

There will also be labor costs associated with each trade involved, so estimates often include contractor and subcontractor fees on top of the hardware. In the end, a fully custom steam shower typically lands between $4,000 and $14,200, depending on the materials selected, the generator chosen, and overall labor in your area.