The difference between a Bali renovation that still looks great in five years and one that is mouldy and lifting after one wet season is almost never the design — it is the boring, invisible decisions about waterproofing and materials. Bali's climate is genuinely hostile to buildings: 85% humidity, a five-month monsoon, salt air on the coast, intense UV and aggressive termites. Here is how to renovate so your villa actually survives it.
Waterproofing Is the Whole Game
If you remember one thing: in Bali, waterproofing is not a detail, it is the foundation of a lasting renovation. The most common — and most expensive — failure we are called to fix is water getting where it shouldn't, because someone treated waterproofing as optional.
Bathrooms
Every wet area needs a proper liquid membrane — two coats, up the walls, across the floor, sealed at every pipe penetration, and flood-tested before tiling. The near-universal local shortcut of tiling straight onto bare screed fails within a year here: water tracks through the grout, the screed stays wet, mould blooms and tiles lift. We treat every bathroom as a waterproofing job with tiles on top, which is why ours carry a 5-year waterproofing warranty.
Flat Roofs and Terraces
Flat roofs and roof terraces are where standing monsoon water defeats ordinary finishes. They need a dedicated membrane system — liquid or sheet — with correct falls so water actually drains. A leaking flat roof is uniquely destructive because water travels along the structure and emerges far from the entry point, ruining ceilings and finishes you only just paid for. See our waterproofing page.
Beating the Termites
Termites are relentless in Bali, worst of all in damp, green areas like Ubud. The defences are: use treated timber or termite-resistant materials from the start; apply soil and barrier treatments; keep timber off direct ground contact; and inspect regularly. When termites are already in, treating the infestation without replacing the damaged structure is pointless — they will keep eating. Our structural team treats, replaces and then protects, so it does not simply return. If you are buying, a structural survey first is cheap insurance.
Materials That Survive the Tropics
Material choices that are perfectly fine in a temperate climate fail fast here. The reliable choices:
- Joinery and cabinetry: marine ply or aluminium carcasses, not standard MDF or flat-pack, which swell and delaminate in the humidity. Critical in kitchens and bathrooms.
- Paint: UV-stable, breathable exterior systems — never cheap emulsion, which chalks and peels within a year under equatorial sun.
- Timber outdoors: treated hardwood with ventilation underneath. Untreated or poorly ventilated timber rots and cups. See outdoor renovation.
- Flooring: sealed natural stone and terrazzo, porcelain tile on a sound waterproofed bed, engineered timber over a moisture-controlled base. Details on the flooring page.
- Fixings on the coast: stainless or properly coated, because salt air eats ordinary steel — vital for beachfront Uluwatu and Canggu villas.
Breathability vs Sealing
A subtle but important point: in humid Bali you often want walls to breathe, not be sealed tight. Trapping moisture behind an impermeable coating causes the damp and blistering it was meant to prevent. The skill is sealing where water attacks (wet areas, flat roofs, the weather side) while letting walls dry where they need to. Getting this balance right is the difference between a damp problem solved and a damp problem moved somewhere worse.
Renovate Once, Properly
Tropical-proofing is not expensive relative to doing the renovation twice — which is what skipping it guarantees. If you are planning a renovation, ask every contractor specifically what waterproofing system, what timber treatment, and what coatings they include, and be suspicious of anyone who waves the question away. We build every project to survive the climate by default, not as an upgrade. Send a video walkthrough on WhatsApp and we will point out exactly where your villa is most exposed and how we would protect it.