Long ago, people often did not build bathrooms inside the house. The idea was that it is better when the bathroom’s surrounding walls can “breathe” and face the outside air. If you place a bathroom deep inside the house, warm humid air is pulled toward colder walls; the steam follows and can spread moisture into wall cavities and the ceiling. What is truly scary is “condensation inside the wall,” caused by temperature differences across the wall. In that sense, a bathroom is not something that naturally belongs in the middle of a house. Still, having the bathroom completely outside is unrealistic for modern homes, isn’t it?

So what can we do? One approach is to place the bathroom at a corner of the house so that at least two walls face the outside air. If possible, you can even create a small courtyard so that three sides face outside. In Kaori’s vacation house, the bathroom is set at a corner, exposing two sides. Because bathrooms are high-humidity spaces, the walls are fully tiled, with antibacterial grout. For finishing, a silicone coating is applied throughout the bathroom to improve water repellency and help prevent mold and stains—reducing maintenance. Fixtures should be rust-resistant (stainless steel for faucets, and ideally resin for door handles). The floor should be slip-resistant, with handrails installed. The bathtub should be easy to step over, and the design should avoid movements that require reaching far below the body, helping reduce risks such as eye-pressure issues and preventing slips or accidental falls.

The hardest decision until the very end was whether to bring hot spring water into the house. In Kaori’s area, the hot spring is a sulfur spring, and I heard that boilers and water heaters can fail in as little as about two years. On top of that, the pipe installation can cost several million yen, and ongoing maintenance also adds up. Coming up with that kind of money is tough—and if you want to enjoy hot springs, there are public baths nearby anyway, so I decided it made more sense to go there.

If you choose a barrier-free, step-free three-panel swing door, you need to be careful that water from the bathroom does not flow into the changing area. Ideally, the changing area should also be tiled so it can handle getting wet. In Kaori’s vacation house, the changing area is tiled as well. Since tiles can feel cold, we also plan underfloor heating for both the bathroom and the changing area so it stays comfortable even barefoot.

When you come to a vacation house, it’s only natural to want to take your time in the bath and truly relax. Even if you usually finish quickly with a shower, at the villa you can soak properly, look out at the garden, and enjoy a calm, restorative moment in a larger bathtub. Just imagining that scene already makes Kaori smile.