Designing a Home Recovery Space: Sauna, Plunge and Layout Ideas

A good home recovery space needs four things: enough floor area for a sauna and a cold plunge side by side, a water-resistant non-slip floor that can take the weight, suitable electrics and ventilation, and an easy way to drain water. Get those right and the rest is towels, hooks and a bit of styling. A spare room, garage, garden room or covered patio can all work.

This guide walks through layout, flooring, power, ventilation, drainage and the small details that make a space pleasant to use every day. For the routines you might run in it, see our contrast therapy guide.

Choosing the right space

Start by deciding what you will put in the room. Most home recovery spaces combine a cold plunge and a sauna, with a little room to sit, dry off and rest between rounds.

Garage: often the most practical. Concrete floors handle weight and water, and there is usually power nearby. It can be cold in winter, which matters more for the sauna than the plunge.
Garden room or outbuilding: a dedicated, calm space. Check it has suitable power and a sound floor.
Spare room or basement: comfortable year round but needs more care with flooring, humidity and spills.
Covered patio: works well for an outdoor-rated plunge. Infrared saunas designed for indoor use need to stay indoors.

Our guides to where to put a cold plunge and indoor versus outdoor plunges go into more detail.

Layout: plan the flow

Think about the order you will use things in. A typical session goes sauna, short rest, plunge, rest, repeat. The ideal layout keeps those steps a few paces apart.

Sauna and plunge close together. You should not have to cross a cold garden or climb stairs with wet feet.
A rest spot between them. A bench or chair where you can sit wrapped in a towel.
Towels and robe within arm's reach of the plunge. The moment you get out is when you want them most.
Clear walkways. Leave room to step in and out of the plunge without squeezing past furniture.

Measure carefully, including door widths and the route in. As a guide, the ThermoX Sauna Mini is a one person infrared cabin measuring 900 x 900 x 1900mm, and the ThermoX Elite cold plunge measures 1950 x 800 x 710mm. Allow space around each for access, cleaning and the plunge cover.

Flooring: water, grip and weight

Water will end up on the floor. Choose flooring that is water-resistant and stays grippy when wet.

Good options: sealed concrete, porcelain tiles with a slip-resistant finish, or rubber gym flooring.
Avoid: carpet and untreated wood, which hold moisture.
Add a mat: a non-slip bath or rubber mat by the plunge exit helps.

Weight matters more than people expect. Water weighs roughly 1kg per litre, so a plunge holding a few hundred litres plus the tub and a person adds up to a lot of weight on a small footprint. Ground floors and concrete slabs are the simplest choice. If you are considering an upper floor or a suspended timber floor, ask a structural engineer or builder to check it first.

Power and electrics

Both saunas and chilled plunges need electricity, so plan this early.

ThermoX infrared saunas run from a standard UK 13A socket.
The ThermoX Elite needs a dedicated UK 230V 13A outlet, and a dedicated circuit is recommended.
Sockets near water should be installed or checked by a qualified electrician. Ask about RCD protection and suitable outdoor-rated sockets if anything will be outside.

Our guide to cold plunge electrical requirements in the UK covers this in more detail.

Ventilation and humidity

An open plunge adds moisture to the air, and a sauna adds warmth. In a small, closed room this can lead to condensation and, over time, damp or mould.

Keep the plunge covered when not in use. An insulated cover also helps hold temperature.
Fit or use an extractor fan, or open a window after sessions.
Consider a dehumidifier in basements or rooms without windows.
Leave the sauna door open for a while after use so it can air out.

Drainage and water care

You will need to change the water in a plunge periodically, so think about where it will go. A hose run to an outside drain or a floor drain makes this much easier. If you are renovating, a floor drain with a gentle fall in a garage or plant room is worth considering. A tap nearby makes refilling simpler too.

Keep a small shelf or box for water care supplies: test strips, spare filter cartridges and a skimmer net. Our cold plunge water care guide explains how often to clean and change water.

The details that make it pleasant

Hooks and towel storage: at least two towels per person per session, plus a robe.
Sliders or sandals: for walking between areas.
A clock or timer: visible from both the sauna and the plunge.
Soft, warm lighting: a dimmable light makes evening sessions more relaxing.
Water bottle station: drink before and after heat sessions.
A rest seat: somewhere to sit between rounds and rewarm.

Building a routine around the space

A well-planned room makes it easier to use your sauna and plunge consistently. Once it is ready, our sauna and cold plunge routine guide explains rounds and timings, and our 4-week starter plan helps newcomers build up gradually.

Safety first

Heat and cold both put demands on the heart and circulation. The British Heart Foundation notes that cold water makes the heart work harder, and the RNLI warns that cold water shock can occur in water below 15°C.

Speak to your GP first if you have a heart condition, high or low blood pressure, are pregnant, or have other medical conditions.
Never plunge alone, never use the plunge or sauna after alcohol, and make sure someone knows when you are using them.
Start warmer and shorter, and build up over weeks.
Keep children and pets away from the plunge and keep it covered when not in use.

Frequently asked questions

How much space do I need for a home sauna and cold plunge?

It depends on the models, but measure each footprint, then add room to step in and out, a rest seat and space for towels. A single garage bay or a small spare room is often enough.

What is the best flooring for a home recovery room?

Sealed concrete, slip-resistant porcelain tiles or rubber gym flooring all work well. Avoid carpet and untreated wood, which hold moisture.

Can I put a cold plunge upstairs?

A filled plunge is very heavy because water weighs about 1kg per litre. Ground floors are simplest, and a structural engineer or builder should check any upper or suspended floor first.