Bathroom Renovation: Working Order, Costs, and Time Estimates

Bathrooms are the smallest room in the house and the easiest to get wrong. One incorrect slope or a rushed waterproofing layer can lead to leaks that force you to break the floor a second time. That is why the order of work matters as much as the design.

This guide covers the correct sequence, realistic cost, and the checks to run before the tiles go on.

Preparation Before Demolition

Do not start hammering until three things are clear.

• Final layout. Where the shower, toilet, sink, and floor drain go. Once tiles are installed, moving them is expensive.
• Existing pipe condition. Old pipes inside the wall may need replacing while the wall is open.
• Waterproofing plan. Which areas get membrane and how high it rises.

If your home has only one bathroom, plan temporary access to water and a toilet during the work.

The Correct Renovation Sequence

1. Demolition. Remove tiles, sanitaryware, and ceiling. Protect the rest of the house from dust.
2. Plumbing and electrical. Install or relocate pipes and wiring for the water heater, lights, and exhaust fan.
3. Wall and floor leveling. Plaster walls and create the floor slope toward the drain.
4. Waterproofing. Apply membrane to the floor and walls up to at least 30 centimeters, higher in the shower area.
5. Flood test. Fill the floor with water for 24 hours and check for leaks below.
6. Tiling. Start with the walls, then the floor, keeping the drain the lowest point.
7. Ceiling and fixtures. Install the ceiling, shower, toilet, and sink.
8. Final checks. Test drainage and water pressure, then seal joints.

The flood test is the step most often skipped. It is also the cheapest insurance against damaging the room below.

Cost Estimate per Component

For a 3×2 meter bathroom in a major city, 2026 prices run roughly as follows:

• Demolition and debris removal: Rp1.5–3 million.
• Plumbing and electrical: Rp3–6 million.
• Waterproofing: Rp1–2 million.
• Wall and floor tiles: Rp4–9 million, depending on material.
• Sanitaryware: Rp3–10 million.
• Ceiling and lighting: Rp1.5–3 million.
• Shower partition or glass: Rp2–5 million.

Total lands around Rp16–38 million for a complete bathroom renovation. If structural work is needed, budget higher. For broader cost context, see our guide to home renovation cost per square meter.

Waterproofing Details That Prevent Leaks

Leaks rarely come from the tile surface. They come from joints, pipe penetrations, and the floor-to-wall transition.

• Corners: reinforce with mesh tape and extra membrane.
• Pipe penetrations: seal with flexible waterproof sealant before tiling.
• Floor slope: aim for 1–2 percent toward the drain.
• Membrane height: at least 30 centimeters on walls, 1.8 meters in the shower.
• Curing time: follow the product instructions before the flood test.

For a detailed reference, see Family Handyman’s bathroom remodeling tips and This Old House bathroom guides.

Choosing Tiles and Fixtures

• Floor tiles: matte with a slight texture to reduce slipping when wet.
• Wall tiles: larger formats mean fewer grout lines and easier cleaning.
• Grout: epoxy or cement-based grout with a sealer in wet areas.
• Toilet: choose a model with easily available spare parts.
• Shower: a rain shower needs adequate water pressure; check before buying.

Keep a box of spare tiles. Matching a discontinued tile two years later is nearly impossible.

Realistic Timeline

• Demolition and preparation: 2–3 days.
• Plumbing and electrical: 3–5 days.
• Waterproofing and flood test: 3–4 days.
• Tiling: 5–7 days.
• Fixtures and finishing: 3–4 days.

Total is about 3 to 4 weeks. Rushing the waterproofing or the flood test is the most common cause of leaks that appear months later.

Common Mistakes

• Skipping the flood test to save a day.
• Installing the floor drain at the highest point.
• Choosing glossy floor tiles that become slippery when wet.
• Not planning ventilation, so the room stays damp.
• Changing the layout after the tiles are installed.

Conclusion

A good bathroom renovation follows one order: demolition, plumbing, leveling, waterproofing, flood test, tiling, fixtures. Get the waterproofing and slope right and the rest is largely cosmetic. If you want a more comfortable result, plan storage and lighting before the first tile is laid.

For storage and layout ideas that match the rest of the house, see our minimalist modern interior guide.