If you’ve moved into one of Okinawa’s classic off-base houses — the flat-roofed concrete homes often called “foreign houses” (gaijin jutaku) — you’ve probably noticed they don’t work quite like a house in the States. Thick concrete walls, tile everywhere, windows made of glass slats, and a yard that seems to grow overnight.
They’re built for typhoons and heat, and they’re great to live in once you know how to look after them. Here’s the practical part-by-part guide.
Concrete walls: great in a typhoon, prone to damp
Concrete keeps the house standing in a typhoon and cool in summer. The trade-off is moisture. Concrete absorbs humidity and stays cool, so damp air condenses on interior walls — especially exterior-facing walls, closets and corners behind furniture.
- Leave a gap between big furniture and exterior walls so air can circulate.
- Watch the corners of bedrooms and closets during the rainy season (roughly May to June). A faint gray shadow is early mold.
- Run a dehumidifier or the AC’s dry mode in rooms you close up for long periods.
- Report spreading mold or water stains to your landlord early. Leaks around windows and the roof are the landlord’s to fix, and catching them early is better for everyone.
We go deeper on this in why Okinawa homes get dirty differently.
Tile floors: tough, but they show everything
Most off-base homes have tile or stone-like floors throughout. They’re cool underfoot and hard to damage, but they show dust, sand and footprints, and the grout lines collect dirt.
- Vacuum or dry-sweep first, then mop. Mopping a sandy floor drags grit across the tile and dulls it.
- Use a damp mop, not a wet one. Standing water seeps into grout and takes a long time to dry in humid weather.
- Pick a neutral floor cleaner. Strong acidic or bleach cleaners can discolor grout over time. Test anything new in a corner.
- Scrub grout lines a few times a year, especially in the kitchen, entryway and bathrooms.
- Use mats at both doors. A rough mat outside and a soft one inside catch most of the sand before it reaches the living room.
- Felt pads under chairs and tables stop scratching and the scraping noise on tile.
Jalousie windows: the glass slats
Many off-base houses have jalousie windows — rows of glass slats you open and close with a crank or lever. They’re perfect for airflow, but each slat is another surface for dust, salt and gecko droppings.
- Open the slats fully and wipe each one on both sides with a damp microfiber cloth. Rinse the cloth often — salt and dust smear if you don’t.
- Near the coast, rinse first. After a windy week or a typhoon, a gentle spray of water dissolves the salt film before you wipe. (See salt and sand for more.)
- Clean the screens behind them every month or two. A soft brush and a damp cloth are enough.
- Keep the crank moving. If it gets stiff, clean out the grit. If it’s still stiff or a slat is cracked, ask your landlord — parts are easy to source locally, but it’s their call.
- Close them before a typhoon. Jalousie windows don’t seal tightly, so expect some water in heavy wind-driven rain. Lay a towel along the sill.
The yard: it grows fast, and it matters
Okinawa’s warm, wet climate means grass and weeds grow much faster than most people expect, especially from spring through fall. An overgrown yard isn’t just untidy; it’s where insects and other pests hide.
- Keep the grass short and the edges clear, especially along walls, fences and stone borders.
- Clear piles of leaves, cut branches and stacked items. Damp, sheltered spots attract centipedes, cockroaches and, in rare cases, snakes.
- About snakes: Okinawa’s venomous habu prefer damp, secluded places like dense brush, sugar cane fields and stone walls. Bites are rare and mostly happen in farming areas, but keeping your yard trimmed and clutter-free is the simplest precaution. If you see one, keep your distance and don’t try to handle it. The base safety office has more guidance (Kadena: Okinawa Snake Safety 101).
- Check your lease. Some landlords include yard maintenance; many leave it to the tenant. Know which before the first big growth spurt in spring.
The roof and drains: check before typhoon season
Flat concrete roofs drain through a few outlets. If leaves or debris block them, water pools and can find its way inside.
- Before typhoon season, ask your landlord or management company whether they check roof drains, or how they’d like you to handle it.
- Clear ground-level drains and gutters around the house so heavy rain can run off.
- Bring in or tie down anything loose in the yard before a storm: chairs, grills, toys, plant pots.
A simple care calendar
| How often | What to do |
|---|---|
| Weekly | Floors (vacuum, then damp mop), bathrooms, kitchen, entry mats |
| Monthly | Jalousie slats and screens, window tracks, AC filters (every two weeks in summer) |
| Every season | Grout, closets and exterior-wall corners for mold, trim the yard edges |
| Before typhoon season | Roof and ground drains, secure yard items, check window seals |
| After a typhoon | Rinse salt off windows and screens, clear debris from the yard |
When it’s too much
A 3–4 bedroom concrete house with tile throughout is a lot to keep up with, especially with kids, pets or a spouse who’s often away. That’s exactly what we do at Tida Home Cleaning: weekly and bi-weekly cleaning for off-base homes, with jalousie windows and a yard tidy-up available as add-ons. And if you’d rather handle it yourself, the calendar above will keep your house in good shape through every season.